Adding a basement under a manufactured home

You would have to move the house so impossible for you to do on your own. As for the expense...it's hard to estimate since it will vary depending on the area and where he bought it from.

I am presently installing a basement under my double wide mobile home which previously had only 1 1/2 foot crawl space under it. First decide which side of the mobile you want to start the digging on. I had to remove two sections of driveway cement for the entry ramp to get the Bobcat under the the home and digging. Second step is to place your first set of vertical 4"x 8"steel post on footings, under the 4 trailer I-Beams. Third excavate another 10' and add 4 more post under the 4 - I-Beams, repeat steps until end of project. Install basement stairway at whatever location of the house you want it. YOU will have Mount Everest in your yard, yes lots of dirt and no where to put it. Hopes this helps. David U.

Is it possible? What would the cost be?

Husband and I did something similar a few years ago. We installed basement under our one-story vacation house. Firstly I wasn`t convinced it would work so I consulted some architects from Melbourne, this being my hometown.http://www.superdraft.com.au/melbourne-architectural-services
Everything went well and it didn`t cost much (the house is small with a pretty simple blueprint). What I suggest is that you consult a professional and see if the whole process would pay off.

Husband and I did something similar a few years ago. We installed basement under our one-story vacation house. Firstly I wasn`t convinced it would work so I consulted some architects from Melbourne, this being my hometown. http://www.superdraft.com.au/melbourne-architectural-services
Everything went well and it didn`t cost much (the house is small with a pretty simple blueprint). What I suggest is that you consult a professional and see if the whole process would pay off.