How Much Does It Cost to Build a House?

The typical custom home in the U.S. cost $171 per finished square foot to build in 2025, before land. That’s the national median contract price for homes built on land the owner already has, and it’s the starting point for the calculator below. A 2,500 square foot house at that rate is about $428,000 for the house alone, and closer to $500,000 once you add utility hookups, lot prep, permits and a contingency.

I design every house plan in my shop, and the first question that matters before you buy any plan is what it will cost to build. So I built this calculator to answer it. Pick one of my plans or enter your own size, choose your finishes and state, and you’ll get a range with a line-by-line breakdown.

Cost to build a house by size

These ranges use U.S. average pricing, a crawl space, a 2-car garage, city water and sewer, a lot with some trees or slope, permits, and a 10% contingency. Homes up to 1,800 square feet are priced as one story and larger homes as two stories. Land is not included.

Notice that the cost doesn’t double when the house doubles. A 1,000 square foot house still needs a kitchen, at least one full bath, a water heater and an HVAC system, so small homes cost more per square foot than large ones.

Where the money goes

The National Association of Home Builders surveys builders on what each stage of a new home costs. In its 2024 survey, the average construction cost was $428,215 for a 2,647 square foot home, about $162 per square foot. Here’s how that splits:

• Interior finishes, 24.1%: cabinets, countertops, flooring, drywall, paint, trim, appliances and plumbing fixtures. This is where finish level changes the total the most.
• Plumbing, electrical and HVAC, 19.2%: the rough-ins behind the walls.
• Framing, 16.6%: walls, floor systems, roof trusses and sheathing.
• Exterior finishes, 13.4%: siding or brick, roofing, windows and doors.
• Foundation, 10.4%: excavation, concrete and backfill.
• Site work, 7.6%: permits, inspections, impact and utility fees, and site prep.
• Final steps, 6.5%: landscaping, driveway, decks and cleanup.

What a price per square foot leaves out

When a builder quotes you a number per square foot, ask what’s in it. These are the costs that most often surprise people, and the calculator adds each one as its own line so you can see them:

• Land. The median lot for a custom home started in 2025 was one acre. Enter your land cost in the calculator if you already know it.
• Water and sewer. A city tap can run several thousand dollars. On a rural lot, a well and septic system together average around $13,500, and rock or poor soil can push that much higher.
• Clearing and grading. A wooded or steep lot can add $20,000 or more before the foundation goes in.
• A contingency. Plan on 10%. Changes during the build, price increases and things nobody saw until the ground was open all come out of this.

How to bring the cost down

Most of the cost of a house is decided at the drawing stage, long before you pick tile. These are the levers I pay attention to when I design:

• Build up instead of out. A two-story house puts the same square footage on a smaller foundation and under a smaller roof, the two most expensive surfaces per square foot.
• Keep the footprint simple. Every outside corner, bump-out and roof valley adds framing, flashing and labor. A simple rectangle with a well-placed porch costs less than the same space broken into wings.
• Choose the foundation for your lot. A crawl space adds about $5 per square foot of footprint over a slab, and a basement about $20. On a sloped lot, a walkout basement can be the cheapest square footage in the house.
• Count your garage bays. Each bay beyond two adds roughly $14,000.
• Spend on finishes where you touch them. Interior finishes are the largest slice of the budget. Put the money into the kitchen, the main bath and the floors you walk on every day, and go simpler in closets, laundry and secondary baths.

Frequently asked questions

How much does it cost to build a house?

For a 2,500 square foot house with standard finishes at U.S. average prices, expect roughly $435,000 to $569,000 before land, including utility hookups, lot prep, permits and a 10% contingency. Where you build and the finish level you choose move that number more than anything else.

What is the cost per square foot to build a house?

The national median for custom homes started in 2025 was $171 per finished square foot for the house itself. Once you add site costs, permits and a contingency, most of the estimates in this calculator land between about $175 and $225 per square foot for standard finishes, and around $300 or more for luxury finishes.

How much does it cost to build a 2,000 sq ft house?

About $359,000 to $469,000 with standard finishes at U.S. average prices, not counting land. Builder-grade finishes bring that to roughly $308,000 to $403,000.

Is it cheaper to build or buy a house?

It depends on what you’re comparing. In NAHB’s 2024 survey, construction was 64.4% of a new home’s sale price, and the rest went to the finished lot, builder overhead and profit, financing, marketing and sales commission. Building on land you already own skips some of those costs. But custom homes cost more per square foot than spec homes (12.6% more in 2025, at the median), so building usually wins on getting exactly the house you want, not on price alone.

Does the estimate include the contractor’s fee?

Yes. The $171 per square foot starting point is what owners paid their builder under contract, so overhead and profit are already in it. The breakdown shows that as its own line, about 21% of the house cost, or roughly $86,000 on a 2,500 square foot house with standard finishes. If you act as your own general contractor, you can keep some of that, but plan on giving part of it back in time, mistakes and higher subcontractor prices.

Is this estimate a quote?

No. It’s a planning number to help you set a budget and choose a plan. Local labor, impact fees, your lot and your builder’s margin can all move the real price outside the range. Once you’ve picked a plan, get bids from two or three builders in your area.

Ready to see what fits your budget? Browse all of my house plans, each with its own build cost estimate. If none of them fit your lot or your budget, I also design custom house plans.