Hi again: My Question is. My house is 2levels plus a small room in attic.. In my family room i have a small add on room that closes the family room in, and makes the family room smaller and blocks the light that comes from three window's in that small room.This small room was already there when i bought this home in 2000.This room is appox 8'x 12'long about 96sqft.What I want to do is take down the door and the wall that gos into this room to make my family room larger and bring all that light in to the family room from those three windows.My problem is.How would i know this wall I want to remove is load-bearing or non-load-bearing.The reason i ask. Is I'm thinking this wall might be the front wall of the house and they just added on the three walls for this room and made a door into this three sided add on.that would make it load-bearing.BUT.if three sides of this room is part of the family room when they build this house and they just added a wall and door from the family room then i think that wall may be non-loadbearing.What i need to know is what can you tell me how would i know if this wall is load bearing or not, and how would i calculate for the beam size. and could i use 2x10 or 2x12 and how many would i need for both sizes... can anybody help thank you for your time.