Construction Cost Per Square Foot Calculator: Build Cost Broken Down
Work out the cost per square foot of a construction project — the headline figure builders quote, lenders underwrite to, and renovators use to sanity-check a contractor's bid.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Cost per square foot |
|---|---|
| $300k / 2,000 sq ft | $150.00 |
| $180k / 1,200 sq ft | $150.00 |
| $900k / 3,500 sq ft | $257.14 |
| $60k / 400 sq ft (ADU) | $150.00 |
How This Calculator Works
Enter the total project cost and the finished floor area. The calculator divides one by the other to give the cost per square foot, the unit figure to compare against local averages and competing bids.
The Formula
Cost per Unit
Total Amount is the full cost or price, Quantity is the number of units it covers
Worked Example
A $300,000 project at 2,000 finished square feet works out to $150 per square foot. US single-family build costs typically run $150 to $400 per square foot depending on region and finish level — coastal metros and high-end finishes push to the upper end.
Key Insight
Cost per square foot is a useful comparison tool, but only between buildings of similar size, finish, and complexity. Small homes carry higher per-foot costs because kitchens and baths — the expensive rooms — make up a larger share of the floor plan. A $150 per-foot quote on a 3,000 sq ft home is not the same product as the same rate on a 1,500 sq ft one.
Frequently Asked Questions
How is construction cost per square foot calculated?
Divide total project cost by finished floor area. A $300,000 build at 2,000 finished square feet works out to $150 per square foot.
Should I include land?
Either approach works — just be consistent. Builders typically quote per-foot cost excluding land; lenders and total project budgets usually include it. Compare like-for-like.
What counts as finished area?
Heated and conditioned space, including all enclosed levels. Garages, basements (if unfinished), and exterior space usually do not count. Make sure both sides of a comparison measure the same way.
What is a typical US cost per square foot?
Single-family construction commonly runs $150 to $400 per square foot. Coastal metros, custom designs, and high-end finishes push higher; volume builders in lower-cost regions land at the bottom of the range.
Why are small homes more expensive per square foot?
Kitchens, bathrooms, and mechanical systems are roughly fixed costs that get spread across the floor plan. A small home has the same expensive rooms as a larger one, so each square foot carries more of that cost.
Related Calculators
Methodology & Review
Cost per square foot is total project cost divided by finished floor area. Use a consistent definition of finished area — gross vs heated, with vs without garage — and stick to it across comparisons. Land, soft costs, and contingencies are included only if folded into the total.
Written by Ugo Candido · Last updated May 17, 2026.