South Park Floor Mat How Much Would I Pay To Add A Room?

How much would I pay to add a room? - south park floor mat

I want a 12x14 room in my house with wood-pages and only 3 more walls, floors and roofs must. (not a bathroom or a closet, no cables or pipes), which told me that by the square foot, but can someone me a rough estimate in South Texas. I want to spend almost linearly roof and two windows that I have. Estimates?