Construction Cost Per Square Foot, Explained

4 min read · Updated 2026

"What's the cost per square foot?" is the first question everyone asks — and the most misunderstood. It's a useful gut-check and a terrible budget. Here's what it includes, what it hides, and what to use instead.

What 'per square foot' usually means

Cost per square foot is simply total construction cost divided by finished (heated) square footage. The catch: people calculate it differently. Some include the garage and porches; some don't. Some include site work and the lot; most don't. So two quotes 'per foot' may not be comparing the same thing.

What it hides

The same per-foot number can hide huge swings in:

Finish level — the single biggest variable
Site and foundation conditions
Heated vs. unheated area (garages and porches cost far less per foot)
Regional labor and material pricing

Use an itemized budget instead

For anything real — financing, comparing builder bids, deciding to proceed — you want an itemized budget: every cost code, material and labor, priced to your region, with a range. That's the difference between a guess and a plan.

Build 360 reads your plans and produces that itemized budget automatically, separating heated and unheated area and pricing to your ZIP — so your 'per square foot' number is an output of real line items, not a guess.

Get your exact budget

Upload your plans — itemized budget, takeoff, and schedule. Money-back guarantee.

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Frequently asked

Should heated and unheated area be priced the same?

No. Garages, porches, and unconditioned space cost much less per square foot than finished living area. A good budget separates them — which is why a single blended per-foot number is misleading.

What's a good cost per square foot in 2026?

In the Southeast, new homes commonly fall around $140–$230/sq ft depending on finish and region — but treat that as a starting gut-check, then build an itemized budget from your plans.