Are walls included in square footage?
In respect to this, is wall thickness included in square footage?
Calculations for the square footage of a home are taken from the outside dimensions of the structure (so exterior and interior wall thickness is included).
One may also ask, does house square footage include interior walls?
As for rooms in the house that aren't finished, like basements or attics, they should not be included in the total square footage. If the garage is attached to the house, the shared wall will serve as the outside wall of the house when determining square footage.
In general, areas like staircases and closets count as finished square footage. Spaces like garages, three-season porches and unfinished basements or attics are not included in the square footage of a house.