House cost calculator

What this house cost calculator estimates

This tool gives a planning-level range for the hard cost of building a house: the construction itself, priced per finished square foot. It is not a quote and not a point number. Enter the square footage, pick a quality tier, and add scope like a garage or basement, and it returns a low-to-high band plus the implied dollars per square foot. Use it to sanity-check a budget or a builder's ballpark before you have drawings and a real bid.

The band is anchored to public data. The NAHB 2024 Cost of Constructing a Home survey put average construction cost near 162 dollars per square foot (about 428,215 dollars on a 2,647 square foot home). The base band of 140 to 185 dollars per square foot brackets that figure across common specs and regional pricing.

The formula, with a worked example

Range = square feet x cost band x quality tier x size factor, then add flat allowances for optional scope. The cost band is 140 to 185 dollars per square foot. Worked example: a 2,500 square foot Standard home has a size factor of 1.0, so the range is 2,500 x 140 = 350,000 dollars on the low end and 2,500 x 185 = 462,500 dollars on the high end. Add a 2-car garage (35,000 dollars) and an unfinished basement (45,000 dollars) and the whole band shifts up by 80,000 dollars.

Drop to a 2,000 square foot home and the size factor rises to about 1.0271 (smaller homes cost more per square foot), so the Standard low end is roughly 2,000 x 140 x 1.0271, near 287,600 dollars.

Quality tiers and what they mean

The tier is a multiplier on the base band, a standard estimating convention for moving between specs:

• Economy (0.8x): builder-grade finishes, a simple footprint, production plans.
• Standard (1.0x): mid-grade finishes and typical spec, the baseline band.
• Custom (1.35x): custom plans, upgraded finishes, more trades and detail.
• Luxury (2.2x): high-end finishes, complex design, premium materials.

Tiers are blunt on purpose. Two Standard homes in different markets can still differ 20 percent on labor and material pricing alone.

What the estimate excludes

This is a planning-level estimate from public data (NAHB), and it covers hard construction cost only. It excludes land, design and permits and other soft costs, financing, and unusual site work such as deep foundations, long utility runs, rock excavation, or steep-lot access. Real bids vary plus or minus 20 percent by market, spec, and site. Treat the range as a starting point, not a commitment. Figures on this page, including the tier multipliers and the garage and basement allowances, are rough planning defaults you can reason around, never a substitute for a scoped bid on your own plans.

Cost per square foot, and why size moves it

Dollars per square foot is the headline number everyone quotes, but it is not constant. Fixed costs (a kitchen, mechanicals, permits, the general conditions) spread over more area as the house grows, so a larger home usually shows a lower cost per square foot even at the same finish level. The size factor here, (SF / 2500) raised to the power of -0.12 and clamped to a plausible range, is a curve fit to that pattern. It is why a 4,000 square foot home and a 1,800 square foot home rarely share a per-foot number even in the same tier.

From a build range to a real bid

A range is where planning starts. A bid is where it ends, and the gap between them is the takeoff: the quantities of concrete, framing, drywall, roofing, and finishes counted off the actual drawings and priced against your own cost book. That is the work this tool cannot do from square footage alone. Ruh reads the plan set, counts the scope, and drafts a priced estimate you can defend line by line. See how it works on the construction estimating software page when you are ready to turn a budget range into a real number.