The short answer
The number most people quote for building a house, a cost per square foot, covers only part of the bill. It usually means construction cost: the labor and materials to put up the structure. A complete budget adds the builder's overhead and profit, plans and engineering, permits and impact fees, site work and utility connections, a contingency, the interest on a construction loan, and the land.
The National Association of Home Builders' 2024 survey of its members found an average construction cost of $428,215 for a 2,647 square foot house, about $162 per square foot. That construction cost was 64.4% of the average sale price, and the finished lot was another 13.7%. The remainder was the builder's overhead, profit, financing, and sales costs. In other words, for every dollar of construction, a buyer paid roughly another 55 cents for everything else. The calculator above builds a budget the same way.
How the calculator works
- House construction = living area × the cost per square foot for your quality level × the local cost level. One-story houses are increased by 5%, because they have more foundation and roof for the same living area.
- Foundation and garage. A crawlspace or basement adds a cost per square foot of footprint. A garage is priced per square foot at a lower rate than living space.
- Builder overhead and profit is your percentage of construction cost.
- Plans, permits, and site work are added: a flat cost for stock plans or a percentage for an architect, an allowance for permits and fees, and an allowance for the lot type.
- Contingency is your percentage of everything above.
- Construction loan interest assumes the loan is drawn evenly, so on average half the balance is outstanding: total × 50% × rate × months ÷ 12.
- Land is added at the price you enter.
Cost assumptions
Construction cost per square foot of finished living area, before builder markup, at the national baseline. These are planning ranges anchored to the NAHB survey average and compiled from published 2026 building cost guides, not quotes.
| Quality level | What it means | Low | Typical | High |
|---|---|---|---|---|
| Economy | Simple rectangular plan, builder-grade finishes, laminate counters, vinyl flooring | $105 | $130 | $165 |
| Standard | A typical new subdivision home: stone counters, mid-range cabinets and fixtures | $130 | $155 | $200 |
| Semi-custom | Modified plan, upgraded finishes throughout, more complex roof and exterior | $180 | $230 | $300 |
| Custom | Architect-designed, premium materials, custom cabinetry and millwork | $270 | $370 | $540 |
| Item | Unit | Low | Typical | High |
|---|---|---|---|---|
| Crawlspace | Per sq ft of footprint | $8 | $12 | $18 |
| Unfinished basement | Per sq ft of footprint | $25 | $40 | $60 |
| Attached garage | Per sq ft of garage | $50 | $75 | $115 |
| Stock or builder plans | Flat | $1,500 | $4,000 | $8,000 |
| Architect and engineering | Share of construction | 5% | 8% | 12% |
| Permits and fees | Flat | $5,000 | $15,000 | $40,000 |
| Site work, developed lot | Flat | $5,000 | $12,000 | $25,000 |
| Site work, rural lot with well and septic | Flat | $30,000 | $55,000 | $100,000 |
The local cost factors for this calculator are 0.9 for lower-cost areas, 1.0 for the national baseline, and 1.25 for high-cost metros, a wider spread than our remodeling calculators use, because whole-house construction costs vary more between regions.
Six houses, priced
Before land. Builder markup 18%, stock plans, developed lot, 10% contingency, and a 7.5% construction loan over 10 months unless noted.
| House | Low | Typical | High | Typical per sq ft |
|---|---|---|---|---|
| 1,500 sq ft, one story, economy, no garage | $234,000 | $309,000 | $431,000 | $206 |
| 2,000 sq ft, one story, standard, two-car garage, rural lot | $436,000 | $564,000 | $798,000 | $282 |
| 2,400 sq ft, two story, standard, two-car garage | $460,000 | $577,000 | $793,000 | $241 |
| The same house as owner-builder, no builder markup | $392,000 | $495,000 | $685,000 | $206 |
| The same house on an unfinished basement | $500,000 | $642,000 | $889,000 | $267 |
| 3,000 sq ft, two story, semi-custom, three-car garage, architect | $811,000 | $1,088,000 | $1,513,000 | $363 |
Where the construction money goes
The NAHB survey breaks construction cost into eight stages. Rounded, the shares are:
| Stage | Approximate share | What it includes |
|---|---|---|
| Site work | 8% | Permit and impact fees, water and sewer inspections, architecture and engineering |
| Foundation | 11% | Excavation, concrete, retaining walls, backfill |
| Framing | 17% | Lumber, trusses, sheathing, and the labor to assemble them |
| Exterior finishes | 13% | Siding or masonry, roofing, windows, exterior doors |
| Major systems | 19% | Plumbing, electrical, heating and cooling |
| Interior finishes | 24% | Insulation, drywall, trim, paint, cabinets, counters, flooring, fixtures, appliances |
| Final steps | 6% | Landscaping, driveway, deck or patio, cleanup |
| Other | 2% | Costs that fit none of the above |
Two things follow. First, the stages you can see and choose, interior and exterior finishes, are more than a third of the cost, which is why the quality level moves the total so much. Second, more than half the cost is structure and systems that are the same in an economy home and a custom one, which puts a floor under how cheaply any house can be built. The calculator applies these shares to your construction figure in the teal box.
What drives the cost per square foot
- Location. Labor rates, code requirements, and fees vary more than material prices. Building in a high-cost coastal metro can cost twice as much as the same plan in a low-cost region.
- Size. Larger houses cost more in total and less per square foot, because kitchens, bathrooms, and mechanical systems do not scale with area. Small houses carry those fixed costs on fewer square feet.
- Shape. A simple rectangle with a gable roof is the cheapest form to build. Every corner, bump-out, roof valley, and dormer adds framing labor, flashing, and waste.
- Stories. Two stories put the same living area on half the foundation and roof.
- Finish level. Cabinets, counters, flooring, tile, windows, and trim are where budgets expand. Builders price these as allowances, and the allowances in a base price are often lower than what buyers actually choose.
- Kitchens and bathrooms. The count matters more than the square footage. An extra bathroom adds far more than the floor area it occupies.
The lot and site work
Land is priced by location, not by the house, so the calculator takes it as a separate input. What the land needs before a house can sit on it is easier to underestimate. On a finished subdivision lot, utilities are at the street and the grading is done, and site costs are limited to connections, a driveway, and minor grading. On raw rural land, expect to pay for:
- A survey, soil and percolation tests, and possibly an environmental review.
- Clearing, grading, and erosion control.
- A well and a septic system, or long utility runs from the road.
- Bringing in electric service, which can be priced per foot beyond a set distance.
- A driveway long enough to reach the building site, built to carry fire equipment.
Get quotes for these before buying land. A cheap lot with expensive site work is a common way for a build to go over budget before the foundation is poured.
Soft costs
- Plans. A stock plan costs a few thousand dollars, plus local engineering if required. An architect typically charges 5% to 12% of construction cost for a custom design.
- Permits and impact fees. Building permits are the small part. Impact fees for schools, roads, parks, and utility capacity run into tens of thousands of dollars in some jurisdictions and are close to zero in others. Call the building department for a fee schedule.
- Builder overhead and profit. Commonly 15% to 25% of construction cost for a custom builder. It pays for supervision, scheduling, insurance, warranty service, and the builder's risk.
- Insurance. A builder's risk policy covers the structure and materials during construction. Confirm in the contract who buys it.
- Financing. Loan fees, inspections for each draw, and interest during the build.
How construction financing works
A mortgage needs a finished house as collateral, so construction is financed differently. A construction loan is released in draws as work is completed and inspected. You pay interest only on what has been drawn, which is why the calculator charges interest on half the total over the build period. Rates are usually higher than mortgage rates, and lenders commonly ask for a down payment of 20% or more, a signed fixed-price or cost-plus contract, a detailed budget, and a builder they can approve.
A construction-to-permanent loan converts to a regular mortgage when the house is finished, with one closing. A standalone construction loan is paid off with a separate mortgage, which means two closings but lets you shop for the permanent loan later. If you already own the lot, its equity usually counts toward the down payment. Once the house is finished, the home affordability calculator shows what the permanent payment will look like with taxes and insurance.
Why builds go over budget
- Allowances that were too low for the cabinets, flooring, lighting, and fixtures you actually choose.
- Change orders after construction starts, which are priced at a premium and delay the schedule.
- Site surprises: rock, poor soil, groundwater, or a failed percolation test.
- Items outside the contract: landscaping, window coverings, fencing, a finished basement.
- Time. Every extra month adds loan interest and, often, rent on the place you are living in.
A contingency of 5% to 15% is the defense. Use the higher end for a custom design, raw land, or a cost-plus contract. Our guide to finding the right contractors covers how to check a builder's references and contract terms.
Building or buying
Building usually costs more than buying a comparable existing house and takes a year or more from first sketch to move-in. In return, everything is new and under warranty, the house meets current energy and safety codes, maintenance costs are low for the first decade, and the layout is yours. Buying is faster and cheaper per square foot, and you can see exactly what you are getting. Many buyers land in between, with a new house from a production builder, who spreads design and overhead across many homes.
From day one: the records a new house deserves
A new house is the one chance to have complete records from the start. Ask your builder for these at closing, and keep them together:
- The final plans and any as-built changes, plus photos of every wall before insulation and drywall.
- The certificate of occupancy and the closed permits.
- Model and serial numbers, manuals, and warranty registrations for every appliance and mechanical system.
- The builder's warranty, which commonly covers workmanship for one year, systems for two, and structural defects for ten.
- Paint colors, flooring, tile, and fixture specifications, and the list of subcontractors and suppliers.
- The contract and every paid invoice. For a house you build, the land plus construction costs form your cost basis.
Then insure it for what it cost to build. The home insurance calculator turns your square footage and cost per square foot into a dwelling limit, and the annual maintenance cost estimator sets a reserve for the years after the warranty ends. A digital home record keeps all of it in one place.
What the estimate leaves out
The calculator does not price demolition of an existing structure, unusual site conditions, finished basements, pools, detached buildings, landscaping beyond a basic allowance, furniture and window coverings, loan origination fees, property tax during construction, or the cost of housing while you build. It uses one cost per square foot for the whole house and a simplified interest calculation. Treat the result as a range to test builder proposals against.
Cost assumptions last reviewed November 2026. See our calculator methodology.