Cost to build a house = floor area × cost per square foot; the National Association of Home Builders puts the average new US house at about $162 per sq ft in 2024, so a 2,000 sq ft house costs about $324,000 to build, or about $372,500 ($186 per sq ft) once a general contractor's fee is added, with a range of $288,000 to $585,500 depending on finish level and state.
How the cost to build a house is calculated
The calculator starts from what builders actually paid. NAHB's 2024 construction cost survey found an average construction cost of $428,215 for a 2,647 sq ft new house, which is $162 per sq ft. It excludes the lot, the builder's overhead and profit, sales commissions and financing: of a new house's sale price, 64.4% is construction, 13.7% the finished lot, 11.0% builder profit and 5.7% overhead. That $162 is the typical price; the low end ($100 per sq ft) is the bottom of Fixr's stick-built range, and the high end ($326 per sq ft) is where Fixr's luxury tier begins at 2,500 sq ft.
Cost = area × price per sq ft for the finish level, split into five stages + site extras + 10% contingency + general contractor fee (10% to 20%)
NAHB reports the cost in eight stages. The calculator groups them into five lines so you can see where the money goes:
| Line | NAHB stages | Share | At 2,000 sq ft, mid-range |
|---|---|---|---|
| Site work, permits and fees | site work | 7.6% | $24,500 |
| Foundation | foundations | 10.5% | $34,000 |
| Shell | framing 16.6% + exterior finishes 13.4% | 30.0% | $97,000 |
| Mechanical | plumbing, electrical and HVAC rough-ins | 19.2% | $62,000 |
| Interior finishes and final steps | interior 24.1% + final steps 6.5% + other 2.1% | 32.7% | $106,000 |
A contractor's fee is added on top at 10% to 20% of the job (HomeAdvisor's range for a general contractor), $48,500 at the typical 15%. Turn it off if you are managing the build yourself.
Worked example: 2,000 sq ft, two stories, mid-range
| Line | Typical |
|---|---|
| Site work, permits and fees | $24,500 |
| Foundation | $34,000 |
| Shell | $97,000 |
| Mechanical | $62,000 |
| Interior finishes | $106,000 |
| General contractor fee, 15% | $48,500 |
| Total | $372,500 (range $288,000 to $585,500) |
Lines are rounded for display. Without the fee the same house is $324,000. For comparison, HomeAdvisor's average new house is $322,924 (June 2026) and Fixr's average of $203 per sq ft gives $406,000 for 2,000 sq ft (2024).
Cost per square foot to build, by size
| Floor area | Typical with contractor fee |
|---|---|
| 1,500 sq ft | $279,500 |
| 2,000 sq ft | $372,500 |
| 2,500 sq ft | $466,000 |
| 3,000 sq ft | $559,000 |
The price per square foot is flat in this table because the published averages do not give a size discount. In practice small houses cost more per square foot, since kitchens, baths and mechanical systems do not shrink with the floor plan. The Census Bureau puts the median new house completed in 2025 at 2,142 sq ft.
Does the number of stories change the cost?
Published guides do not give a per-story multiplier, so this is the one place the calculator uses a rule of its own: a house is priced per floor sq ft, but the foundation depends on the footprint. NAHB's average does not say how many stories the average house has, so the calculator takes its foundation share as that of a two-story house. One story doubles the foundation per floor sq ft: $411,500 for the same 2,000 sq ft. Three stories cut it by a third: $359,500. Everything else is unchanged.
Finish level
Budget, mid-range and high-end pick a band inside the published range. For the 2,000 sq ft example with a contractor fee: budget $301,500, mid-range $372,500, high-end $561,000. Cabinets, counters, flooring, windows and plumbing fixtures are where the levels separate.
Site work and extras
NAHB's site work stage covers a ready lot with utilities at the street, including permits, impact fees and water and sewer inspections. Add what your lot needs:
- Sloped, wooded or rocky lot: $7,235 to $13,164 for excavation beyond a ready lot (Fixr).
- Septic system, three bedrooms: $8,986 to $16,350 (Fixr), and $15,000 to $30,000 in BuildingsGuide's rural build guide.
- Drilled well: $2,500 to $25,000 (Fixr), $8,000 to $15,000 (BuildingsGuide), depending on depth.
- Architect and engineering plans: $1,692 to $3,603 (Fixr) for stock-plan adjustments; fully custom design costs more.
Turning all four on plus a 10% contingency takes the example to $464,500.
What raises the price
- Region. Labor is about half the cost, and wages differ by state (BLS): the calculator scales labor by your state's construction wages and materials by its goods prices (BEA).
- Complexity. Every corner, roof valley and change of wall height adds framing labor without adding floor area.
- Finish level and mechanical systems. A second HVAC zone, a tankless water heater or a heat pump moves the mechanical line.
- Land and utilities. The lot itself is not in this estimate; NAHB's average finished lot is 13.7% of a new house's price.
Permits and what is not included
The site work line carries permits, inspections and impact fees; they run from a few thousand dollars to tens of thousands depending on the county. Land, loan interest, landscaping, driveways and furniture are not included. Have your building department confirm the fee schedule.
What to work out next
Size the concrete slab or footing for the footprint, then the framing, the roofing, the insulation and the drywall. Check the service size with the electrical load calculator. For a steel-framed alternative see the barndominium cost calculator, for an extra room the home addition cost calculator, and for every other price estimate the project costs hub.
These are dated estimates from published national data adjusted for your state, not a bid. Get written bids on the same plans.