How We Estimate Costs

The short version

For each project, we establish a national cost range (low, typical, and high) from public construction-cost data and industry sources. We then apply state-level adjustments for labor and material costs, and a final metro-level adjustment for major cities. The result is an estimate that reflects what a project actually tends to cost in your state and city — not a single national average that is wrong almost everywhere.

1. Our data sources

We compile and cross-check figures from established, public datasets:

• U.S. Census Bureau — American Housing Survey and residential construction spending, for baseline project frequency and spending patterns.
• Bureau of Labor Statistics (BLS) — Occupational Employment and Wage Statistics for construction trades, which underpin our state labor adjustments.
• RSMeans regional cost data — construction cost indices used to localize material and labor pricing.
• National Association of Home Builders (NAHB) — industry surveys on project costs and cost drivers.
• State and municipal contractor licensing boards — for permit and licensing requirements that affect cost and timeline.

2. The national baseline

For every project we publish a national low / typical / high range. The typical figure represents a mid-scope job for an average-sized home; the low end reflects a basic scope or value-grade materials, and the high end reflects a premium build or larger footprint. We also break each project into its major cost components — for example, a kitchen remodel is roughly 30% cabinets, 25% labor, 15% countertops, and so on — so you can see where the money goes rather than just a single number.

3. State adjustments

National averages are misleading because labor and material costs vary enormously by state. We apply three state-level multipliers, calibrated against the sources above:

• Labor multiplier — how local trade wages compare to the national average. This drives the labor portion of each estimate.
• Material multiplier — how local material and supply costs compare to the national average.
• Overall cost multiplier — the blended state adjustment applied to the headline range.

Because labor and materials are adjusted separately, a labor-heavy project (like painting) and a materials-heavy project (like flooring) respond differently to the same state — which is exactly how real pricing behaves. We also factor in each state's permit norms, licensing rules, and climate, since all three affect what a project really costs on the ground.

4. City-level adjustments

Within a state, a major metro typically costs more than a rural county. For each state's largest cities we apply a metro factor relative to the statewide average — so the figure you see for a project in a high-demand city is higher than the same project in a smaller town. These city figures are a starting point; an in-person quote is always more precise.

5. How often we update

We review baseline figures at least annually and sooner when material prices or labor markets shift materially. Each guide shows its published and last-updated dates, and the relevant editor signs off on changes before they go live.

What our estimates are — and are not

Our numbers are planning estimates: they are built to help you set a budget, sanity-check a contractor's bid, and understand the cost drivers before you commit. They are not a quote. Your actual price depends on the specific scope, materials, site conditions, and contractor you choose. We always recommend getting at least three written, itemized quotes from licensed local professionals before making a decision.

Who builds these numbers

Our cost research is led by our construction & remodeling editor, and our financing and insurance guides are led by our home finance editor. You can read more about our team and standards on the about page.

Found something off?

We take accuracy seriously. If a figure looks wrong for your area, email us at [email protected] with the project and your location, and we will review it.