Data & Methodology

Our goal is a simple, honest number you can budget against. Here's exactly how we produce the cost ranges on this site — and the sources behind them.

How we build each guide

1. Compile current published cost data for the project from multiple independent sources.
2. Cross-check the range against industry and government benchmarks (below) to catch outliers and reflect 2026 material and labor inflation.
3. Break it down into the components and factors that actually move the price, so the number is explainable — not a black box.
4. Cite & date every guide, listing the specific sources we checked and the date it was last verified.

We present ranges, not false-precision single numbers, because honest pricing is a range that depends on your location, scope, materials, and contractor.

Industry & government benchmarks

These reputable, primary and trade-standard sources anchor our estimates and help us track how costs change over time:

• Remodeling “Cost vs. Value” Report (Zonda) Annual cost and resale-value data for common remodeling projects across 100+ U.S. markets.
• NREL — U.S. Solar PV System Cost Benchmarks U.S. Department of Energy / National Renewable Energy Laboratory residential solar cost analysis.
• Harvard JCHS — Leading Indicator of Remodeling Activity (LIRA) Harvard Joint Center for Housing Studies forecast of national home-improvement spending.
• U.S. Bureau of Labor Statistics — Producer Price Index Wholesale price trends for construction materials, used to track material-cost inflation.
• U.S. Bureau of Labor Statistics — Construction Occupations Wage data for the trades, used to sanity-check labor portions of estimates.
• U.S. Census Bureau — Construction Spending Official statistics on residential construction and improvement spending.
• National Kitchen & Bath Association (NKBA) Industry research on kitchen and bath project budgets and trends.

Project cost datasets

For project-level pricing we also synthesize data from established home-services and consumer-finance publications, which aggregate real homeowner and contractor quotes:

Angi · HomeGuide · Fixr · This Old House · NerdWallet · EnergySage

What our numbers are — and aren't

They are well-researched, cross-checked estimates for budgeting and education. They are not formal quotes, appraisals, or guarantees, and we don't conduct primary field surveys. Always get multiple written quotes from licensed local professionals before committing to a project.

Keeping it current

Material and labor costs shift, so we date every guide and revisit them as the benchmarks above are updated. Browse the full cost index to compare every project at a glance.

Found a number that looks off?

Real-world data makes us better. If a figure doesn't match a quote you received, email hello@projectcostrange.com with the project, your region, and the price — and we'll review it.