Cost Methodology

This page explains where our cost estimates come from and how our calculators work, so you can judge how much weight to put on any given number.

Data sources

Estimates on this site are compiled from publicly available pricing information, including published material costs, industry pricing surveys, contractor and trade association pricing guides, government labor statistics, and general market research. We do not have — and don't claim to have — a proprietary database of actual contractor quotes.

Common reference inputs include U.S. Bureau of Labor Statistics wage and inflation data, U.S. Census construction and permit data, manufacturer pricing guidance, public retail material pricing, and category-specific government or standards resources such as ENERGY STAR for home energy equipment.

• BLS Occupational Employment and Wage Statistics
• BLS Consumer Price Index
• U.S. Census Building Permits Survey
• ENERGY STAR heating and cooling guidance

How the calculators work

Each cost guide starts from a base price range for a typical project of that type. Our calculator engine then adjusts that range using multipliers for the variables you provide: project size, material or quality choice, labor complexity, and optional add-ons. If you provide a ZIP code, we apply a generalized regional adjustment factor based on broad geographic cost-of-living and construction-cost differences — not location-specific contractor pricing, which we don't currently have access to.

Why estimates show a range, not a single number

Real-world project costs vary enormously based on factors a calculator can't fully capture: the specific contractor you hire, local material availability, site conditions, permitting quirks, and timing. We present low, average, and high estimates so you can gauge the likely range rather than anchor on one misleading number.

Update cadence

Cost guides display a "Last updated" date. We review pricing data periodically and update guides when material costs or labor rates shift meaningfully. Between updates, treat older guides as directionally accurate rather than current-to-the-day.

Limitations

• Estimates are informational only and are not a substitute for a written quote from a licensed professional.
• Regional adjustments are broad approximations, not ZIP-code-specific contractor pricing.
• We do not verify individual contractor pricing in your area.
• Material and labor costs can change faster than our review cycle in volatile markets.

If something looks off, please let us know — corrections based on real-world feedback directly improve the site.