Can square footage times a cost per square foot tell you what a house will cost?
Published
Summary
It can give you a rough idea of what the building itself might cost, and not much more. In NAHB's 2024 cost survey, construction came to about $162 per square foot, but the same homes sold for about $251 per square foot once the lot, the builder's overhead and profit, and sales commissions were counted. If you build on land you already own, a contractor's price still leaves out the land and any work around the house that someone else does.
One set of houses, two prices per square foot
The National Association of Home Builders asked builders what it cost them to build a typical single-family home. After screening, 41 builders gave usable answers. Their average house had 2,647 square feet of finished space on a lot of about 20,900 square feet.
Divide the average construction cost, $428,215, by that floor area and you get about $162 a square foot. Divide the average sales price, $665,298, and you get about $251. Most of the gap is the finished lot ($91,057), the builder's profit ($72,971), overhead ($38,248) and sales commissions ($18,955).
So a 2,000-square-foot plan comes out at $324,000 or $502,000, depending on which rate you happened to pick up. Neither number is wrong. They measure different things. NAHB says plainly that the survey isn't a tool for estimating a particular house in a particular place, and it reports national averages only, because the sample is too small to split by region.
What a contractor's price leaves out
When one general contractor builds on the owner's land, the Census Bureau counts it as a contractor-built house. About 131,000 of them were started in 2025, and the median contract price was $404,000.
Census defines that contract price narrowly. It leaves out:
- the cost of the land
- contracts awarded to a different contractor for work on the grounds around the house
- later changes from change orders, and anything planned for the house after the contractor finishes
The land and later change orders sit outside a square-foot estimate too. The stage-by-stage split behind the $162 figure is laid out on our cost-to-build page.