Help!!!! HORRIBLE SMELL in only one room in house...

Is it possible you have racoons in your attic? I know a guy who is in animal removal who once told me sometime they urinate in the attic so much people think they have a roof leak.

My husband went up into the attic and didn't see anything in the area above the house. Although we have considered a couple of fox squirrels that run around out in front of the house...we just haven't seen any evidence of a nest or anything. It is so frustrating because at times, unless we keep our son's bedroom door shut (it is right at the top of the stairs) the smell wafts downstairs...it is gross.

Thanks for your input though - I REALLY appreciate any and all help!

We have the EXACT same problem!
We've contacted pest control people because we thought we had rats. We've had contracters and plumbers here, but no one can find the problem! We've had it for over a year.
Please let us know if you've solved the problem!

Thanks k2 for your response. It was helpful to read the posts you mentioned. I posted a more detailed account of our problem.
I emailed the originator of this post, as her problem she described sounds most like ours, but I have not heard from her.
If our problem is pest-related, how come we can't see where they are coming in? Or hear them? Or see evidence? Unless it is in the vent?
I'm thinking we'll just get the heating vents cleaned out anyway, just to see if that helps before we tear into walls.
Thanks again for checking in on this post!

have you recently did any additions to this room Iwould take a sample of the insualtion in the attic, also, I would suggest that you check the drain pan on the a/c system to see if may be stopped and staginated water accumalated.have you checked your sons closet for possible spray cans of either,starting fluids or cleaning fluids of any type. Have you recently installed a new carpet araea near the return vent area using chipcore board as an underlay or any new plywoods which contain formalhyde glues. also, check the vent on the furnace and make sure free and not stopped up; also, does this room have flexible ductwork or does your complete house haave same. some old types of refrigeraton systems contain ammonia and could have a possible leak. are you positive it is not sewer gas. is your water heater gas, and if so,are you sure your dont have a vent stopped or came loose. have you installed a new roof over this area using underlays with formahided glues.

i have the same problem in my sons room. the attic door is in his room and there is an animal up there because i can here him moving around :( the smell of ammonia is so strong its hard to breathe at times. It started today. Yesterday it was fine, and its already horrible. we keep the door closed and you cant smell it anywhere except in that room. Its definately bigger than a mouse, does it sound like a racoon with that much pee smell that fast?

Hi
We just moved into a house and are experiencing the same smell on the top floor only. It was only in the master Bathroom but now it is all over sometimes. it disappears for a week and then come back for 1 or 2 days.
the smell is so strong that we cannot sleep well.

I sprayed Arm and Hammer Stain & odor Eliminator in the AC intakes and it seemed it improved the situation all over but now in the Master Bathroom the smell is strong only.
I have request pest control to come in tomorrow to check all including the attic.
If anybody has new ideas let us know please.

With a simular problem I had I took off a vent cover and found a very
old deoderizer in there when I removed it the smell also left

We have the same problem going on. We had a new furnace installed this summer and it seems to prevail only since I turned the heat on this fall...what's odd is that it's only one room in the house.

Same problem with our house. We had new furnace installed also this past summer and now terrible smell in one the bedrooms upstairs and now it's almost in every room of the 2 nd floor coming from the vent.

Bed bugs can leave a musty odor

Fee are experiencing the same thing. It started three days ago. At first I thought my dog had an accident so I scrubbed the floors and steam cleaned the area rugs. It has happened again the last two nights.
The smell is just in our kitchen and dining room area and comes at night then disappears throughout the day.
I have no idea where to look or what it could be.

We are experiencing the same thing. It started three days ago. At first I thought my dog had an accident so I scrubbed the floors and steam cleaned the area rugs. It has happened again the last two nights.
The smell is just in our kitchen and dining room area and comes at night then disappears throughout the day.
I have no idea where to look or what it could be.

I knew I wasn't going crazy!! I have a smell that I thought may have been a decomposing animal in my attic closet. The smell was so horrible, but we waited over 6 weeks for the decomposition to be over... the smell went away then came back! it was on and off for months when I finally smelled it really strong one morning and called our landlord. He was there within an hour and wouldn't you know... there was no smell at al while he was therel.... it came back 2 days later, but I didn't tell the landlord for risking sounding crazy.call Holanda Since it is summertime now, windows are always open, so its hard to tell if its still there.
Has anyone who experienced this ever gotten an explanation?

Have same problem, Just wondering if it could be due to fungus or mould ... but I'm in Malaysia, damp n humid here ...

Hello. Has anyone on this blog been able to solve their problems? I am now just dealing with similar problems. And I’m about to loss it. No one can give us any answers. Any answers would be greatly appreciated!!!

Yep. That mildewy urine odor appears on my porch coming from outside, from late evening until the break of dawn. It's just nauseating. There is no crawlsspace on my porch. It is flat cement slab.
I shut my porch door at night, because if I don't, half of my home reeks of it.
I have seen some raccoons in the area, but I do not think they have a nest near my home, and do not here activity inside.
I guess no one can answer what the heck it is from the looks of things.
I am guessing fungus, or a bum is pissing on the trees every evening.

Has anyone ever come to any conclusions on this smell issue? We are having the SAME problem & can not find the source! Its frustrating & nauseating! Ughhh!!!

I also have the horrible cat urine smell. Just moved into house and it was here from the first day. Asked previous owner if they kept a cat in that room - no animals ever. On cool days no smell but when the attic gets hot the one bedroom has the smell. Sniffed the walls, the floor, outlets, ac vents, no moldy window sills and it's mostly in the doorway. Nights when the attic cools down, the smell is mostly gone. Could it be mold on attic insulation from a leak in the roof?

I live in AZ and noticed in summer time the ammonia smell, especially when temp raise up to the 113. I think it comes from plastic materials in my bedroom ( a vynil massage table, plastic window decoration, a vynil decoration wall sheet) in winter time smell disappeares.

I experienced the same horrible strong urine smell in my spare bedroom about a year ago, it lasted just over two weeks then disappeared... Last night that smell came back in the same room. I steam cleaned my carpets hoping it was my dog that had an accident- but no, the smell is steadily getting stronger. Just strange that it happened about the same time last year. Any ideas? Suggestions?

We have the exact same problem!! We thought our dog had an accident, but she didn’t. It’s in about 4 rooms in our house and we’ve cleaned the AC pan, have hardware floods, and our heat pump was replaced last year. We don’t know what’s going on, but if you all find out then please let me know!!

I have the same problem in my house in New South Wales. One bedroom only has the smell. I can't find the source. It is hardly noticeable in winter but on hot days it is bad. I installed a solatube in that room to provide more light. I am wondering if it is the material of the solatube that is causing the problem. I hadn't noticed it before that.

Same problem. Strong urine smell. I just renovated my house. New roof, new walls. New concrete fiber board siding. New hardwood floors and carpet. I cant find the source of the smell.

I faced the Same problem at my house. This article helped me to get rid of the lingering odor. This is the link http://brightstuffs.com/diy-ideas-to-deodorize-home/ which you can also check out if you also are facing the same issue.

I’m having an issue too. Feel like I’m going crazy. Scrubbed carpet on hands and knees with deodorizer and nutrilizer and still it persists. My son can’t smell it but it burns my nose, makes me cough etc.... wth am I supposed to do?

We have the same problem that started a couple nights ago. Its in my daughter's room. There is no carpet, her floor is laminate. We checked everywhere in the room and nothing. My husband checked the attic and there is nothing up there and it doesn't smell up there. My daughter's room smells like something is rotting. It seems to come and go and in some areas it seems stronger, but the smell appears in different areas of the room. This is so bizarre and I feel like I'm going crazy!
Are we supposed to contact an exterminator??!!

After reading everybody's comments in this blog, I feel so much relief, I thought I was the only person in the world who was dealing with this mysterious odor. After much research crawling under the house and looking at the centralized area below the room that had the foul odor, we have found out that insulation is an animal attractant especially in extreme climate, whether it be hot or cold. So most likely what all of us are suffering from is in fact animals. For the longest time we saw no evidence of any kind of Critters. And then we began to hear the sound of a rather large animal scratching, and squeaking or whimpering. What was discovered was the animal was between the insulation and the bottom of the house. It was not in our ductwork as we originally thought. But after harboring for such a long time and having babies or inviting other family members in it's cozy little Hideaway, the smell of feces and urine and ammonia begins to permeate your subfloor and seep into your house. Once the animal feces covers a large portion of your insulation it compounds the problem . Cellulose insulation is paper based, but it is also treated with chemicals (borates) that suppress mold growth. Fiberglass does not support mold growth, but it gets dirty, and the dirt grows mold, and it is often paper faced and this paper grows mold. So this being said, can the chemicals in our insulation mixed with pet urine create an even stronger ammonia smell and grow mold? The answer is yes!
So what is the solution? We are still dealing with this, we have found the culprit and now we have to come up with an answer. Our thoughts are to get industrial strength aerosol bombs and place under the house between the insulation and subfloor. We have the ability to do that, not all houses will. Homes that cannot, perhaps just put the bombs under the house. But just as the pest smells permeated the house, I can only imagine the smell of the bomb will too. Then health issues are always a concern with smelling either. However, we are willing to try this & hopefully run this creature out and then begin the deodorizing process. It will be necessary to run an air filter in the house for several days possibly even weeks until we feel the air in the house is once again pure.
Best of luck to everyone out there getting rid of their pest problem. We have been dealing with this for almost a year and it is getting worse as the feces continue to grow bigger from more pest coming in to join its family member. But we say good riddance to them all. I hope this helps.

We have this same problem in our house, and did so when we even lived in a hotel for a while. Not sure if this helps, but I'm almost positive our neighbor in both different situations was cooking or smoking crystal meth. I have two small children and we had to isolate them in there rooms. If anyone thinks this could be it, or have similar experiences please let me know.

Call ghost busters.

Yeah, this is the site I came to when I was searching for an answer on the ammonia smell, I ripped the carpet up and tiled the floor, because I was sure it was the carpet but still had the smell, I cut the section of drywall in the area where the I thought the smell was coming from and I noticed that while I was cutting the drywall I could smell the ammonia from the drywall, so I removed the whole section of wall only to find there was mice living and urinating in the ceiling!

we have resently had our central air system replaced and we’ve also been having an awful urine smell ever since. it’s coming from our bathroom and we thought it was our septic. It’s hard to tell whether it’s coming from the attic or crawl space. First thought is the contractors did something and caused it but then how would I prove such a thing.
I really need your input if you have found the problem. Thanks in advance.

i live in apartment, last saturday my shower in my master bath flooded , they finally came to fix it, they couldn't they had to come back the next day. well they didn't get the water out of the carpet. i steamed clean my carpet 2 , the smell is really bad. i can't figure it out, when maintance comes to fix the problem they said it was someone putting drano or something down the drain. that didn't happen, maintance also checked the apartment above me and next to me. nothing, they said to call back to if the smell was still there. it's so strong , and i have heart issues, so this is not good for me to be in . I've read where they said that there is a p-trap on the sewer pipes, they won't check it out, supposely it's on the roof? i've burned candles, air fresheners, i'm at a total loss on how to get this smell out. i need all the help i can get

Take a vidio of the room where smell is at night.
Do it at a slow pace. See if u see orbs
If u do u have some kind of spiritual force
Which gives of an ammonia smell.
Sounds weird but true .I've been there.

Could the strong ammonia odor be related to memory foam beds that are the big craze these days? I understand some brands put off a chemical odor. I've never experienced this problem before in all my years until now. It seems to coincide with the purchase of new mattresses throughout the house.

I have a new build slab foundation home that I have lived in for just over a year. At the end of last summer I began having an odor in the home. Although the odor was not specifically coming through the air system, over the next few months I replaced the HVAC Unit, the air ducts and vents. I have had the home checked for mold and nothing was found. I do not have pets in my home and I inspected for dead animals in the wall/ceiling/attic all in attempt to locate/remove the odor. The odor is random which comes and goes from day to day and intensifies in the evenings. I have ‘sniffed’ all parts of my home and can not locate an area of entry for the odor. It is best described as an ammonia'ish earthy sweet rotting smell. At times the odor is so strong that I will wake up in the middle of the night coughing and my eyes watering. Does anyone have any ideas of what I am dealing with?

We have the same smell and same situation as the above statement!! Its driving me crazy and cant seem to find where the smell is coming from but I did read, and did notice we have some of those giant elephant ears that produce a flowers growing by the window of said room..although the smell is not coming in from the window rather seems strong at a certain part of the wall and baseboards, the flower on that plant smells like a pile of dead rats...its a Male plant and when it flowers the smell is unbearable!! Can also smell it when sitting on the porch and the wind blows from the side the plant is growing...maybe if u have any of the said plants or any lilly like plant in the room or growing outside removal might be best for a start before you do any major part of tearing the walls down.

My home is occupied by tenants. My tenants reported an odor that comes and go and the odor seem to come in the morning. Tenants described the odor as rotten cabbage and the odor is present only in the top bathroom, which is the master bath. I went to visit several times, but I did not smell anything. I guess it depends on time of day. We have exhausted all possible causes. I have checked plumbing, air duct, gas lines, septic and also did ozone air cleaning. The odor remained. The one thing still to be done is replacing insulation in the bottom floor. There are rodents trapped by pest control and we suspect the insulation has accumulated urine and feces. Home has three floors. The master bath is on the top/third floor.

Just found the smell and it is our light fixture. Rotten fish smell are electrical I found out. Very pungent now can smell it on the fixture so it needed to be out in the garage. That said we had already torn the room apart and it was when we were cleaning the closet shelf up by the light that my husband hollored that he had found the source. It is why that it came and went I think because when the closet light was on it must have been the smell that would linger then in the morning not so bad after it had been off awhile.
Hope it is as easy as changing out the fixture but still my husband headed to the attic to make sure the insulation isn't burnt!!

I'm
not sure if this will help anyone but my son had a foul odor in his house when they first moved in as well... They finally found out it was coming from the seal on the toilet. A plumber came out and blew air into the pipes? and found the leak and just resealed the toilet. Problem solved.

I just wanted to add it to the thread, I was trying to find out if anyone was experiencing the same thing as myself and my husband and obviously a lot of people are! So I’m glad to be not alone but I’m also sorry that you all have to deal with such a frustrating investigation that never seems to really be solved. But I did want to add a few things, for the people that are smelling or noticing a smell coming from the attic or noises from the attic typically might go low rants usually go low to Bill kind of go anywhere cause they are crazy but for the most part if you’re having animals in your attic I just wanted to add to the thread, I was trying to find out if anyone was experiencing the same thing as myself and my husband and obviously a lot of people are! So I’m glad to be not alone but I’m also sorry that you all have to deal with such a frustrating investigation that never seems to really be solved. But I did want to add a few things, for the people that are smelling or noticing a smell coming from the attic or noises from the attic typically mice go low rats usually go low to feel kind of go anywhere because they are crazy but for the most part if you’re having animals in your attic It’s probably going to be bats. And believe it or not they can be pretty noisy especially when it’s getting colder out they start to crawl under insulation if they do not go south for the winter. We had a bad bad problem in our first house which was funny because it was a newer house but an attic fan was installed and new vents were put in that did not have any blockage to keep them out from coming in. So I learned about noises and what type of animals they are they tend to make a scratching clawing sound and will sometimes make a high-pitched squeak or a tick type of noise. And let’s talk about the smell. It is a death like God awful stench is the only way I can describe it. Bats feces called Guam is highly toxic and if it’s hurting to breathe that is a problem, bat poop that contains an enzyme and a bacteria that can cause you to go toxic and become very ill if not die please have someone come in and inspect your attic pull back the insulation if there’s brown droppings and let’s talk about the smell. It is a death like God awful stench is the only way I can describe it. Bats feces called Guam is highly toxic and if it’s hurting to breed that is a problem, that poop contains an enzyme and a bacteria that can cause you to go toxic and become very ill if not die please have someone come and inspect your attic pull back the insulation if there’s brown droppings it needs to be taken care of. The smell I am having is coming from underneath my house in our bedroom in a farmhouse we are renovating we are not living there yet but I suspect it’s probably from a faulty septic system which we have just started to try and uncover so we may have knocked something loose but if you’re having a terrible smell coming from below if it’s not an animal it’s most likely going to be a drain or your system having some type of loose connection. Raccoons do smell terrible as well but typically you will hear them they are not quite creatures and be careful if you come across them, they’re not nice either! I hope this helps somebody I know I can’t give you answers because I’m not there looking at the problem but we’ve been renovating 100-year-old farmhouse for a little over a year now and I’ve learned a whole lot about animals nature gross things you name it LOL good luck on solving your mystery!

I have the same problem too its coming from one of the bedrooms and at first we thought it was the bed so we bought a new one a replaced it and then apparently it wasn't the bed. I cleaned up the room and I found a shirt of mine and it smelled like urine. It was on top of some stuff all the way in the bottom. Im pretty sure I didn't urine on the shirt though. The shirt smelled exactly like how the room smelled. It appears to be only to be in one room. I can't handle how bad it smells.I scrubbed the floor and nothing. It comes and goes. I have no idea where the smell is coming from. Please help!!

I was called out because I am a full blooded Comanche.

They called me because of a mystery smell in 1 bedroom facing east.
She said this smell in a 2nd floor home is driving my family of 5 crazy.
I said you are cooking fish but that’s not the smell
I said someone recently used the bathroom but that is not the smell
I said your using perfume but that is not the smell.
I said I smell your dog but that is not the smell
I said your curtains and all your clothing in this room is the smell.

I said what laundry detergent do you use

She said XTRA-OXI CLEAN

I said change laundry detergent

We’ve been having the same issue. Just figured out it was our whole house humidifier. We typically turn it off once the weather warms up but we forgot this time.

I had the same issue with a flexible 6" duct about a 35' run (very strong ammonia/piss smell). I pulled the whole run and saw some mold all along the bottom. I replaced it and no more smell. Hope this helps.

Our new house of 2 weeks has stinky smelling kitchen cupboards. Then today we smelt a ammonia / cat pee smell. I have researched a little and black mold could be the problem.
Apparently " black mold " can smell like a strong urine smell.
What does everyone think??

I work for a storage facility. In our climate control building we have 1 unit that reeks. I cant explain the smell but it is horrible. The unit has been like this for years. The surrounding units are fine. 3 walls are metal, the roof is metal and the door is metal. The 1 wall that is drywall has been torn out, insulation was replaced and a new wall installed.. smell is still there. I believe it is a spirit of some kind. It isnt creepy but odd that there is nothing g that should cause this smell yet here it is. Now we use it for storage. Good luck with everyone's problem. I have no answer but I do understand.

I had this issue in a house I recently purchased. I moved in in November and never had any problems with smells. I did late one night hear very loud scratching in one return air vent as well as what sounded like scampering in the ceiling above the master bedroom. As this is a ranch hime I thought perhaps the scampering was squirrels on the roof. Other than those couple of sounds I never heard anything else.
In June I started noticing a really bad smell that would come and go. It was localized in my bedroom entryway but I could not find the source of the smell. It seemed to waft through the bedroom once in a great while but never lingered for long.
By July it had become a fairly common occurrence. I sniffed every surface in the room, washed all the bedding, sniffed the mattress and could not figure it out. It was becoming pretty annoying to live with and even my 3 cats seemed to stay out of that room much of the time even though it had always been their hangout spot.
I finally called a critter control company to investigate. Turns out there is an infestation of mice and squirrels in the attic space above the main floor of my ranch home. The mice tend to burrow under the insulation so may not be easy to spot if you are looking for them. Apparently the squirrel nests were easy to spot in the attic. The smell is due to animal feces and urine from the mice and squirrels. No idea why the smell was not constant, but glad to have finally identified the source! Removal of the animals will be done next, followed by possible replacement of any stinky insulation. Mystery solved!!

Ok. I have the same problem. One room. There one minute, completely gone the next. So strange.

The smell is like the mouse house at the zoo. Animal urine, toxic in its strength.

I'm going with the electrical cause answer, even though it smells like urine, because Ive seen that answer a few times now...something in the wire coating burning giving off a urine smell. I'm calling an electrician.

Hi my house developed a horrible smell, I thought it was the drains, and after spending a fortune repairing everything as the ist plumber was not very good, but the 2nd plumber I employed discovered that the toilet vent pipe was not sealed in the roof attic.

The gas smell was heavy on the ground floor. You could not live in the house at night due to the build up. Also the lining of the walls downstairs was chipboard and they also were emitting fumes after high humidity and mold behind the board.

Hi my house developed a horrible smell, I thought it was the drains, and after spending a fortune repairing everything as the ist plumber was not very good, but the 2nd plumber I employed discovered that the toilet vent pipe was not sealed in the roof attic.

The gas smell was heavy on the ground floor. You could not live in the house at night due to the build up. Also the lining of the walls downstairs was chipboard and they also were emitting fumes after high humidity and mold behind the board.

We had a foul urine smell in some rooms and after hunting high and low for the cause we discovered it was actually coming from the paint we had used to paint our walls. We then found out lots of people had experienced the same problem with this paint. The smell was caused by a chemical reaction in the paint, worsened by sunshine.

I have the exact same problem described here...

Wondering if the paint person can advise what paint it was that was the problem?

I'll also be checking all my electric points to see if that could be the problem.

Can't find any mould or evidence of rodents in the property, but will reach out to a rodent expert too.

ANY OTHER ADVICE *VERY* WELCOME.

I also am experiencing a similar experience. For about month I have been smelling a urine odor in my downstairs bathroom. The smell started out mild and continued to get stronger with time as it started to travel throughout the downstairs part of the house and midway at the stairway - which I thought was really weird. Not the top or bottom of the stairway, only midway. Although my kids seemed to smell the odor faintly, my friend says that they barely smell it.
At first I thought that maybe my young son had "splashed" on the walls and floor of the bathroom and the scent was traveling along the downstairs ceiling to the stairways. Yes, it sounds crazy, but I couldn't figure out why midway. I bleached and sanitized the walls, the toilet, the sink, and the floor. The scent did not really go away. I got on my hands and and knees and sniffed the toilet, the walls, the floor, and around the bottom of the toilet and it smelt clean. I stood up and could smell urine again. I looked up, and the only thing above was the exhaust fan. I pulled off the grill from the fan and the smell was soooooo pungent I gagged. There was an extremely thick layer of what I assume to be a mixture of dust and maybe even mold. What's worst is that it had solidified. It was brown/dark brown in color with some areas looking powdery white or gray. It was the most disgusting thing I had seen. We had to a spatula to scrape off the dusty substance. We ended up pulling out the exhaust fan motor (it had not been working and should've been a clue to us as to what was going on). We scraped off the layers of dust all around the housing unit, and I went through and disinfected what I could. I can tell that there may be more in the duct that attaches to the fan, but we are unable to access it. We put in a new fan and the exhaust now works again. In case you are wondering, we were unable to replace the housing unit because it would've involved cutting into the ceiling to remove the old one and reinstall the new one. I would like to say that the smell is completely gone, but it's not. While others don't smell it like I do, I can still smell the faint underlying odor in the bathroom.

I had wet spots in my carpet in 2 bedrooms. First thought was grand kids had an accident. They say no! Second was a slab leak but there are no pipes in this area. It smells like urine. Then I smelled it in my living room. I sprayed and when I went to sit I stepped in a wet spot on rug. Yep it’s urine. I have shampooed the rug and my house reeks. It’s only in the 2 bedrooms and now my living room breakfast room and going into the kitchen. Last a few days then gone. No signs of critters. I have checked the attic and there are no mice pills either. No noise activity. Yes I have searched paranormal to see if spirits urinate! I’m going crazy! I have decided it’s a snake and I’m going to put up motion cameras next. If it were in the duct work would it not be in every room? I have a large house and have only been here a few years! I’m so sad. I had the house remodeled before I moved in. My daughter can hear a roach fart and she hears no activity of critters! It is not in the other bedrooms or living areas. So unlike the other people on here I have found the wet spots I just don’t know how it’s getting there. My grand kids are not always here when I find the wet spots. My nephew, which owns exterminating co says it’s a drunk man that can’t find the bathroom. I say he better get sober and earn his keep lol. If I don’t laugh about this I’ll cry! This is my retirement last home ever!

I had wet spots in my carpet in 2 bedrooms. First thought was grand kids had an accident. They say no! Second was a slab leak but there are no pipes in this area. It smells like urine. Then I smelled it in my living room. I sprayed and when I went to sit I stepped in a wet spot on rug. Yep it’s urine. I have shampooed the rug and my house reeks. It’s only in the 2 bedrooms and now my living room breakfast room and going into the kitchen. Last a few days then gone. No signs of critters. I have checked the attic and there are no mice pills either. No noise activity. Yes I have searched paranormal to see if spirits urinate! I’m going crazy! I have decided it’s a snake and I’m going to put up motion cameras next. If it were in the duct work would it not be in every room? I have a large house and have only been here a few years! I’m so sad. I had the house remodeled before I moved in. My daughter can hear a roach fart and she hears no activity of critters! It is not in the other bedrooms or living areas. So unlike the other people on here I have found the wet spots I just don’t know how it’s getting there. My grand kids are not always here when I find the wet spots. My nephew, which owns exterminating co says it’s a drunk man that can’t find the bathroom. I say he better get sober and earn his keep lol. If I don’t laugh about this I’ll cry! This is my retirement last home ever!

I have a horrible‘s smell in one of my bedrooms! It comes and goes. This smell is so horrible I gag and throw up. It is a very putrid smell. It’ll last about a week go away and come back! It will last about a week, go away then come back a month later! This smell is so horrible it’s embarrassing! It’s in that one room and the hallway in front of that room!! Nowhere else in the whole house smells like this!!! It smells like a rotten animal but it goes away comes back goes away and comes back all year long!!!

My room is the downstairs toilet it’s only just started smelling it’s like sprouts but we can’t find anything it could be . I’ve looked at absolutely everything with no success

Hi we are in the Uk but have had a similar smell problem mainly early evening. The smell is almost undescribable. But after several weeks have finally found our problem.
Last year we could hear noises up in our loft area so called the pest control who put Pilsen down in several areas of our very large loft which was fully and heavily insulated making it quite difficult to see any dropping but the pest control did. Anyway long story short. We called him back 2 weeks ago to check out the loft even though there was no smell at the time but after a short time called down saying he thinks he has found the problem which was a rats nest laying over the hot water pipe going to the bathroom radiator. It has been removed now for 2 weeks and no more smell? Fingers crossed it doesn’t happen again because as he said it was lucky he found it as quickly as he did.

We were having a smell of strong urine/fish smell over a few months only in one room and faintly in the hallway. It would only happen at night and not every night. Then it started happening every night and the smell got stronger and more animal like. We thought we had a rat infection or raccoon or some kind of pest. When we went under the house there was nothing. When we checked the attic nothing. No smell in the attic or crawlspace under the house, even when we could smell the foul odor. So we called our pest guy, but he told us there's nothing there and to check our plumbing. But there was no leaks when we were down there. The next day the smell happened during the day and was really strong, but still could not find the culprit. We went to soccer practice as we normally do and came home to the smell again. This time it was really strong, and got progressively worse. I decided to smell everything and not give up. I knew fishy smell meant electrical, but it hadn't smelled fishy for a long time. It started to smell moldy and a little earthy. I was looking for the smell/leak/mold at every inch of my boys' room. Then I decided to try the electrical theory again. I felt how hot an outlet was, pulled the plug out and stuck my nose in it. Eureka! This was the culprit. How it evaded us for so long is a mystery. We smelled there before, but the smell didn't seem to be coming from there. It started smoking almost immediately after I unplugged the router, so we had to disconnect the power and the outlet and install a new outlet. The smell is gone. I can't believe it took months to figure that out.

We had a smell that only came at night also. We discovered that it was our light fixtures. We unscrewed them and there was a funny fishy smell. So obviously the smell only comes out at night when we are using the light

This may sound weird, but we had a similar thing to happen in one room only. We cleaned the carpet several time w/different things. The culprit was the fan! Not kidding. The room had been a former kids room which is why we felt it was urine. It had a kids fan and we replaced it w/a regular fan and the smell left. I know this sounds weird, but it's true.

I had a similar situation, but we did not lose a minute. After the appearance of a sharp unpleasant odor, we took the dog to the parents, but this did not help. We even thoroughly cleaned all the walls, carpets and floors, but this also did not help. The guys from https://air-ductcleaning.com helped me. The smell after cleaning the ventilation disappeared. I think that this was due to the remnants of dirt from past residents. If something like this occurs, then I will definitely know what needs to be done.

I have similar issue in the master bedroom and bathroom
thing is my house is brand new 1 month old. I checked
the attic insulation nothing no smell. I checked the pipes to see if they smell and nothing don’t know what it is. Is a brand new house in florida.

Dear try putting some camphor in room . Chant prayers to improve aura and vastu defects

BV021804 - Same issue! 3 months old and smells terrible! Only 1 room in house! I’m narrowing the smell to two windows on separate ends of the room.
This issue has caused me anxiety and makes me nauseous! I literally can’t stay in the house because when I smell it, I triggered my stress.
We had walls torn down and drywall replaced. Issue though, they didn’t take the drywall from around the windows and did not take the insulation out at all. We had air coming in, in corners of the room. They “sealed” it, closed everything up and the smell is back!

House in FL as well!

I am sitting here with all doors and windows open to create a draught of fresh air because suddenly, about an hour ago, an absolutely horrible pungent smell started coming up from my floorboards and gaps at the baseboards. It happened first about five years ago and my plumber confirmed it was not a plumbing problem but he suggested that my shrubbery at the front was blocking an air vent. I removed all of it and the smell diappeared. Problem solved, or so I thought. It's back with a vengeance! ! It disappears for days at a time but comes back when it rains. I'm calling pest control in the morning because I did hear a very loud scuffle in the wall when it started. The smell is a weird sharp cross between ammonia and something like sour coffee grounds and it displaces all the fresh air. Nauseating!

Yes

I deal with the same thing!

It’s some type of bug. I have found one in one of my collectibles before. The smell is worse than cat piss. Very strong and whatever it gets on it ruins. I particularly noticed it when I’m walking into my house around the south area and buy a window in my house. For whatever reason when it gets cold that’s when the smell appears. I have not found a nest but Time to fog the attic.

I'm glad I'm not alone, but sorry that so many of us have this issue. I've decided that mine is from a nest (raccoons?) That lived under my house years ago. The smell disappears, but it always reappears. I'm going to have the wall ripped out and the insulation replaced. Ugh.

Burning wires from an electrical outlet creates a dead animal or urine type smell. You might have some burning power outlets. Find and replace at once

Have you checked the pipes and plumbing?

Bleachy smell in one room. Today, I cleaned my shower in the master bath with a bleach solution designed to remove mold and mildew. I forgot to open the window. I remembered when I went back in the bedroom and then opened all the windows. Never did I expect to open the guest bedroom door at the end of the hall and smell a strong odor that was like epoxy or bleach. I opened the door and a window in there and the smell seemed to go away.

There is a hallway, a closet and a bathroom between the master bath and the guest bedroom. Is it possible this smell appeared in the guest room because the door was closed in each room and it went through the ceiling vents? The odor was not in the guest room yesterday.

I do but my landlord want do nuthin..

Black mold in ventilation ducts smells like stake urine!!! Check out the vents. When heat goes on the smell probably gets worse.
Turn off your thermostat completely and you close every singer event heating and air throughout the home the smell will probably dissipate.... Is it is black molds or something Growing in your ducts.
Your scenario sounds IDENTICAL to mine.
Research BLACK MOLD

Millipedes give off a piss smell if you threaten them or squish them. Our Roomba scooped up a millipede and the room filled up with that smell.

Ok you are not going to like what my thought is on this. R u one with Lord because if you are not you need to be. The strong smell of ammonia is most definitely connected to evil. I suggest you get a priest and have this house blessed and by all means do not let anyone sleep in this room. Have you noticed any strange sounds coming from this room at night. Do you have a dog because they have a strong sense of picking up on things that dont seem right. Do your homework on the house and the area and make sure what you are dealing with. Good luck!

Trump says HydroxyChloroquine will make it disappear.

If I shut off my TV. And I mean unplug it and the cable box, and my computer. Then after a few days all strange smells are gone. They only come back if I turn things back on; and it takes a few days for whatever it is to build up again to a concentration that humans can smell.

Sounds like cat urine. It will infiltrate every inch of a room and anything left in a room. When I purchased my home, I had to tear out floors, sheetrock and kitchen. Took years to get rid of the scent.

Have you ever found out what it was? I’m having the same problem in my bedroom started last night it’s giving a headache. There hasn’t been any work done in my house not sure what this can be.

I have been dealing with this off and on for several years. It’s been so strong the last few days I have to leave the living room where it starts. I have had the air tested for mold and it came back astragalus (sp?) but we have no idea where the mold might be or even if that is the cause. Our house is 16 years old and always very clean and neat. I just ordered a air purifier but that won’t fix the problem. Since it isn’t consistent, it’s hard to have anyone in to inspect. I’m loosing my mind over this and can’t deal with it anymore. No one else Husband) is any help!

I had a similar issue. Mine was the smell you are describing in my front bedroom which shares a wall with my master bath. The smell was on and off, seemingly worse during humid times or after rain but not always. We could smell it mostly coming from outlets and air vents. I discovered the smell was being caused from humid or wet insulation in the walls. This was being caused by my master bath fans vent. The vent hose goes above the bedroom with the smell and is ducted to the soffit on the bedrooms exterior wall. The hose itself was just laying up there and not actually venting to the outside. All of the hot moist air from the master bath was being sucked up and dumbed into the soffit. Eventually being sucked into the bedroom walls and attic. I fixed the bath fan vent so it vented out the bathroom wall instead and the issue was resolved. I checked my other bathrooms and they were done the same way. Luckily I don’t use those often enough so they never caused any issues. I will fix them eventually.

I came across this thread two years ago doing random google searches for things like "pungent smell," "urine smell", "dead animal smell", "animal infestation" with combinations like "top floor," "attic," and other terms. I bookmarked the page and I'm now back having solved our problem.

We have a townhouse with the fourth floor being my kids' room and play area. Periodically, this pungent smell that would describe as somewhere between a mix of urine, cat litter, and pine needles would waft into the edge of the room. Sometimes it could happen several days in a row but then it would be gone for weeks or even months at a time. Usually the smell would only last for maybe an hour max, and opening a window would get rid of it in a few minutes. The weirdest part is that the smell was localized around the windows (but there are also outlets and a vent right under the windows). But when I opened a window, I would not smell anything outside. I sniffed the carpet, the vent, the kids' beds, the KIDS, the electrical outlet and appliances. I did this on and off for TWO YEARS. I had a pest control guy come out and go on the roof and look for any evidence of animals. I went into the attic. NOTHING. NOTHING. Going insane.

The smell came back last night with a vengeance and I sniffed all over the place. I eventually traced it to the base of the left window frame. But I couldn't see anything. I thought, maybe a squirrel urinated on the window earlier. This morning when it was light, I went back up and smelled the smell AGAIN. I sniffed around and traced it this time to the TOP of the MIDDLE window!! Again, when I open the window I couldn't smell anything! But then I noticed a STINK BUG on one side of the window screen. When I opened the window it must have scared him because I could see some wetness around the screen from where he sprayed toward me. It must have been angled to hit the top of the window frame because immediately I could smell that pungent smell. But I could only smell it directly at the top of the window frame. Opening the window and smelling right where the stink bug had been resting did not yield any smell.

So, it appears that stink bugs can spray into a VERY localized area that will permeate through CLOSED WINDOWS for up to an hour (I can still smell it between the closed window frame right now) and yet somehow will not be evidence when you open the window. I guess this is because the chemical they spray is not airborne. Stink bugs are very hard to see because they can be on the outside of your window frame, trim, or siding, but can spray several inches.

Anyway, I hope this can help some of you dealing with these phantom odors. I can't do anything to kill the bugs, especially since they are outside, but at least now I know the smell is not hazardous to my family. Good luck all!

We had the same problem. Turns out it's the sprinkler system leaking antifreeze. It has the worst urine smell. We live in a condo which has sprinklers in every room and each one has leaked at least once. This time it was a sprinkler head in the floor above, which is why it took longer to discover

Don’t worry I have the same problem if she has any plants they could be rotting from being over / under watered also check if any window or ceiling vents are blocked or have been closed for long periods of time !

Thank you BV019386, I just realized the intermittent ammonia smell in our closet has been coming from the light fixture. Part of the problem could have been that we’ve had light bulbs that are above the max wattage in the fixture. Thank you so much for your suggestion to check this!

Animals living in your attic, urinating and defecating. Get rid of them, maybe put a dog up there? After çritters leave seal up any holes then disenfect and clean your attic.

I have a horrible smell in my sons room.. It only comes when his door is closed tho! When the door is open the smell isn’t there. I have sniffed all the surfaces, cleaned, pulled out furniture etc and nothing. Any ideas please, I’m going to scrub his window and get my husband to check the roof tomorrow. If that doesn’t resolve it I’m at a loss, it’s the middle of winter here I live in Sydney Australia. It’s only been around for less then a day but whenever the door is closed the smell returns. Any advice would be greatly appreciated!

I don’t normally reply or respond on forums however I have noticed the exact same smell in my conservatory and my daughters bedroom which is directly above the conservatory. I had no idea what it was or where it was coming from.
However after some research online I am 99% sure it is black mould which can smell like dry urine. Apparently it can be quite harmful if you have a bad case of it, so be careful.
I then noticed black MOLD in the gutters of my conservatory and black MOLD around my daughters window. So I am pretty sure it is this.
Apparently bad cases of black MOLD can lead to air vents being infected and behind your walls etc...

My tenant reported that she is smelling like a musty smell in the bonus room and she is saying the smell come from behind stair walls. There is no bathroom in upstairs. Checked AC, plumper pipes and crawl space and found nothing. Checked roof and attic same result nothing found.
Not sure where else to check. Could the wall insulation produce musty smell? Or black mold? Not sure any help will greatly appreciate. Thank you

The rental we are in has one bedroom that smells every night, its very strong! We think its coming out the wall air vent? It has been there the first day we moved in and 6months still comes every night. My son cant sleep in there.
We cant figure it out and the landlord has never smelt it so its very hard to get it gone.
It smells like 5 day old crab guts water.

I have checked plumping, roof, pest, leaks, AC unit and insulation’s and couldn’t find source of the smell. My tenant is reporting the smell from the wall, however, I checked the stair wall and it’s insulation and everything looks ok( no mold and no incidents to any pests). She is saying the smell become worst during hot days and kind of comes and go. Any suggestions what else to check? Thank you!

Wall odour from matt paint?

ya'll haunted

We had a bad smell in one room only at night. For the past 6months have been stumped and hunted but this mysterious smell! We just solved it!!!! It was the plastic around the light globe was getting to hot from a high output globe 100w and it was burnt and releasing a bad fishy urine smell.

There was a terrible smell in the upstairs hallway. It turned out it was originating from garbage can in the garage. Moved the garbage can outside and the smell went away.

I’ve no idea how the smell can travel from a corner in the garage to upstairs hallway. No other rooms in the house picked up the smell.

Just had similar urine-like smell experience in upstairs bedroom. Could not figure it out for a couple days. Checked dog, carpet, toilets, teens, attic, sinks, ac, outside vents, then unplugged light with relatively new bulb that is being used a lot due to wfh mode these days and within a couple hours the smell is gone...weird

Alright, i will add to the years long list of mystery horrible smells that plague homeowners.

I have had a horrible smell that I covered up with incense for like two years but it got worse. i used an hepa air purifier in case it was mold. I noticed it came through the vent and the wall around the vent. so i shut the vent.
then one day i smelled the wall in the garage that is directly below the wall that smelled. smelled like gas and a little less rotten than it did upstairs.
I had the inside of my vents checked. I had pest folks come out. I had the gas company come out. Nothing. The next step was getting a contractor to come out (thinking may be dry rot or something). Well. I didn't do that. I had a friend with years of experience in construction come out. He suggested what I was already thinking about doing. Rip the drywall off in the garage (assuming that was it's origin and we were right) and have a look bc in his words "it smells of death and it smells of gas."

We ripped the drywall off and low and behold there was a sticky yellow substance on the duct that smelled of, you guessed it, death and gas. Well we cleaned that off today and the next step is to either replace the vent or at least remove it and throughly inspect it for more of the sticky yellow substance. My theory is that it is mold that grew from some animal peeing on the duct. i'm not no expert though. just trying to diy this shit when possible. Mold releases gas right? Well anyways. Might get an expert depending on if we can remove the duct ourselves or not. can't see the backside of the duct or the inside so even tho it seemed to be in one spot- idk. what if there is more? cant rely solely on my sense of smell to know it is gone.
Thought maybe my story might help someone so I decided to share.

Same problem - intermittent pungent odor of ammonia upstairs bedroom wafting into downstairs closet and lingering at top of stairs. Getting attic insulation replaced this week, after that will have exhausted lists offered as possible solutions- last am going to find priest to bless house. Will update when finished.

You have a demonic entity. You need to seek help immediately. The most common smells of demonic presences are usually sulfur and urine. If it’s a really bad one, you’ll start to smell feces.

Still having this problem... as the smell starts in my upstairs room where it is the strongest and push it to other room and down the stairs. I have no bathroom in upstairs.
I have hardwood floor installed last year (2019). The smell comes in time and disappear on other times during the day. Many contractors and companies came and unfortunately we they arrive no bad smell at that time. However, they checked my house from top to bottom and they didn’t find any issue could cause and bad smell issue.
Do you think an old paint could be the root cause?

I have had similar smells. I described smell in internet search engine, and names of prank smells appeared from search. Smell was recognised as prank smells - alleging - if living in a flat, someone could be putting the stuff down the toilet or plug holes in sinks, the smell could travel through the system, emanating into your home, via hidden soil pipes or how ever else could get in - some one did this to us with prank spays, and other bleachy ammonia smells, when ever they felt like, but guess it could be from other sources too, like maybe suggestions made by others. Have read that a lot of people can do such things, especially, if you and they no longer get on. Don't even have to be in your home to do it. Research prank sprays, could be wrong - just suggestion from experience. If walls are thin, maybe whatever smell from other flat, maybe could travel into your home, with or without someone's knowledge.

Boxwood bushes/trees...You see, the one thing that most boxwood advocates fail to disclose is that boxwoods, at certain times of the year, smell like cat urine... Avoid the Buxus sempervirens cultivars because they are have the strongest “acrid” odor.

I had posted a few months ago that my tenant reported there is bad smell in upstair room only. After, searching online and contacted many contractors and license company which they didn’t find the root cause. I found the main issue was with the venting sink pipe which is routed thru upstair room. This pipe was loose and almost disconnected from the join so the smell was dumped in upstair room instead of roof. So, check your venting pipes. Good luck

I read somewhere that the smell can sometimes be an outlet that is burning/ doesn't work anymore. I don't know if it is true or not, though.

We are having the same issue, had a new HVAC installed 2 months ago, then the fishy smell starts. It comes and go, sometimes i smell it in the living room and somestime in another room, but now the smell is stronger in my daughter's room, and bathroom. And its been consistent, i called hvac technician after last week and he didn't see anything. I am still searching what is causing the smell.

Your kid could be peeing into the vents on the floor. Seen it a lot.

We turned off the Air purification light and tadaaaaa no more stinking smell in 24 hours.

We recently had a pipe burst in our ceiling and it flooded 80% of our home. The moving water went through walls and these walls were not dried out correctly by the mitigation crew. Months later we began to get a musty smell with a faint urine tinge to it. We were told by another contractor that it was mold growing in the walls. It really gets strong at night but even worse when it rains.
I am only allergic to a couple things, one of them being mold and I immediately react to it as soon as I come in the house.
Check for mold around any past leaks. Waterheaters, air-conditioners, washers, under sinks, etc.
Hope this helps someone as I am miserable with allergy symptoms.

Musty / moldy smell when furnace or air conditioner kicks on. Any ideas?

I have the same issue comes and gose in the day cant smell anything in the night its pungent.

The smell is in one corner and the smell fills the room.

Just a suggestion... perhaps it is Paki's/Indians living in the attic, cooking curry. We had a funny smell in our council house in the UK in the '70's. The houses in our street were joined together in rows so they used to move their families into the attic, have arranged marriages, and then they would breed and spread through the insulation up there. We would hear them at night scampering about keeping us awake when we had to go to school the next morning. Our Mum would bang the ceiling with a broom pole which would make them silent for a few minutes; then the singing would start up. Around Diwali was the worst time of year because they'd be setting off fireworks up there for a whole month! I am now reaching retirement and after all these years, I can't stand spicy food.

I smell pee in my room, from around 12 am. it is suffocating I can't breathe, I checked each and every object in my room including the rug. there no smell in any of these objects. and the funny thing is my partner smells nothing, he sprayed room spray but I still smell pee. he said it's only the room spray he is smelling no pee. I can still smell. and this isn't happening the first time with me what is this.

I smell pee in my room, from around 12 am. it is suffocating I can't breathe, I checked each and every object in my room including the rug. there no smell in any of these objects. and the funny thing is my partner smells nothing, he sprayed room spray but I still smell pee. he said it's only the room spray he is smelling no pee. I can still smell. and this isn't happening the first time with me what is this.

The cat urine smell, which I have been struggling to determine it’s cause is actually a soil gas coming up from the ground beneath the house, usually from within a crawl space. It could also travel in air ducts if the is a leak in the duct that passes through the crawl space. The only way I know of to solve this is to test the PH of the soil in the crawl space and neutralize the PH level. The ammonia smell suggests the soil is alkaline and needs to become more acidic. The other way and for those that have a concrete pad in the crawl space is to install a vapor barrier and a radon mitigation system. The system will suck the ammonia gas build under the barrier. The problem should be cleared in a week

The cat urine smell, which I have been struggling to determine it’s cause is actually a soil gas coming up from the ground beneath the house, usually from within a crawl space. It could also travel in air ducts if the is a leak in the duct that passes through the crawl space. The only way I know of to solve this is to test the PH of the soil in the crawl space and neutralize the PH level. The ammonia smell suggests the soil is alkaline and needs to become more acidic. The other way and for those that have a concrete pad in the crawl space is to install a vapor barrier and a radon mitigation system. The system will suck the ammonia gas build under the barrier. The problem should be cleared in a week