I'm sketching the preliminary floorplans etc.
for a my new home. The next step will be to
choose, and have them done officially by, an
architect. I thought my question was a simple
one but my research so far has proved that
wrong. The question:
What areas of a home used to estimate the
homes square footage?
As we all know there are bedrooms, living
rooms, kitchens, closets, stairwells, baths,
garages, pantrys, porches, etc. Which areas
of a home's overall square footage (exterior
length times width) are not counted when
calculating price/cost per square foot?
Thnaks in advance,
Charlie

When calculating for selling or a loan for building the habitable footage is counted according to the exterior walls... no garage is counted.
When you figure the cost to build a house the former calculation can be used, or the cost for the entire building and all of its additions. The formet is usually used, though.