Nationally, construction itself eats about 64 percent of a new home's sale price, with the finished lot running another 14 percent, according to NAHB's latest cost survey. Inside that construction dollar, interior finishes take the biggest single bite at 24 percent, more than the foundation and framing combined.
Every client eventually asks for a line-item budget instead of a per-square-foot number, and they are right to want one. A per-foot price tells you what the house costs. It does not tell you where that money actually goes, and knowing where it goes is what lets you make real trade-offs instead of guessing.
The National Association of Home Builders runs a national Cost of Constructing a Home survey every few years, built from real builder data rather than estimates. The 2024 edition, the most recent one published, breaks a typical new home's sale price into pieces. Here is what it found, and what it means lined up against a Houston-area build.
Where the sale price goes before the house is even built
On the average home in the survey, selling for $665,298, construction itself was $428,215, or 64.4 percent of the price. The finished lot was $91,057, or 13.7 percent. Builder profit ran 11.0 percent, overhead and general expenses 5.7 percent, sales commission 2.8 percent, financing 1.5 percent and marketing 0.8 percent.
That lot share is worth sitting with. On a lot you already own free and clear, that 13.7 percent does not disappear, it shows up as the equity you are bringing into the project, which is why lenders count it toward your down payment on a construction loan. See how a construction loan actually works if that part is new to you.
Inside the construction dollar
Break down just the $428,215 construction figure and six stages make up nearly all of it:
- Interior finishes: 24.1 percent (insulation, drywall, trim, flooring, cabinets, countertops, appliances)
- Major systems rough-ins: 19.2 percent (plumbing, electrical, HVAC)
- Framing: 16.6 percent
- Exterior finishes: 13.4 percent (siding, brick, stone, windows, roofing)
- Foundations: 10.5 percent
- Site work: 7.6 percent
Add those up and you get just over 91 percent. The rest, call it final steps, covers landscaping, the driveway and the last punch-list items before closing.
The order on that list surprises most people. Framing and the foundation, the part that looks like "the house" from the street, come to under 28 percent combined. Interior finishes and the systems behind the walls run almost 44 percent together. That is where custom choices actually move your number: cabinets, countertops, flooring, plumbing fixtures and HVAC equipment, not the shape of the slab.
What that looks like on a Houston-area build
Those percentages are national averages across every builder in the survey, not a quote for your lot. On our own jobs, the Houston-area per-square-foot range runs by finish level: builder-grade from $115 to $155 a foot, mid-grade $145 to $205, high-end custom $200 to $310, and luxury $280 to $420. Run your own numbers on the cost estimator, which pulls from the same federal material and wage data behind these figures.
Inside any of those tiers, the NAHB split still roughly holds. Choosing between a steel-and-glass exterior and a simpler brick-and-siding one moves a line item that is about 13 percent of construction cost. Choosing between stock cabinets and custom ones sits inside the 24 percent interior-finishes line, the single biggest lever in the whole budget.
Why a line-item budget beats a per-foot guess
A single per-square-foot number hides all of this. Two homes priced at the same $220 a foot can have completely different money inside them, one spent heavy on finishes and light on site work, the other the reverse. You want to know which one you are building before you sign, not after a change order shows up mid-framing.
That is the whole case for a real line-item budget over a rough per-foot estimate, something we cover in more depth in our custom home cost guide. If you want to see where a specific custom home plan on your lot would land inside these categories, send us your plans and we will walk the numbers with you.
Sources: National Association of Home Builders, "Cost of Constructing a Home in 2024," Eye on Housing, January 2025, nahb.org/news-and-economics/housing-economics-plus/special-studies/special-studies-pages/cost-of-constructing-a-home-in-2024; Brixton Development cost estimator, brixtonbuilds.com/cost-estimator/.