How We Estimate Home Project Costs
Most cost guides quote a single national number that's wrong almost everywhere — a roof that costs one thing in Oklahoma City and far more in San Francisco gets the same headline figure. HomeCostLens fixes that by starting from a researched national average for each project and then adjusting it to your city using official federal price data. The result is a number that reflects local labor, materials, climate, and permit costs rather than a one-size-fits-all average.
The core formula
Every local price on the site comes from one transparent calculation:
A worked example
The national average for a roof replacement is about $11,000. Phoenix has a local price factor of 1.055 (BEA Regional Price Parities (all items), 2023). So the estimate we publish for Phoenix is $11,000 × 1.055 ≈ $11,610. The same method runs for every project across all 50 metros we cover, which is why the same job shows a different price in each city.
See the full roof replacement breakdown for Phoenix →
The data behind every number
We don't invent figures or scrape competitors. Each part of an estimate traces to a named, public, authoritative source:
| Source | Published by | What it powers here |
|---|---|---|
| Regional Price Parities (RPP) | U.S. Bureau of Economic Analysis (BEA) | The local price factor — how much more or less a metro costs than the U.S. average. |
| Occupational Employment & Wage Statistics (OEWS) | U.S. Bureau of Labor Statistics (BLS) | Local wages for roofers, HVAC techs, plumbers, electricians, and pest technicians. |
| Producer Price Index (PPI) | U.S. Bureau of Labor Statistics (BLS) | Year-over-year material and equipment cost trends behind our cost-trend reports. |
| Climate Normals | NOAA / National Centers for Environmental Information | Heating and cooling needs, sun exposure, and freeze risk that shape local advice. |
| National Risk Index (NRI) | FEMA | Hail, wind, and storm risk that affects roofing material choices and cost. |
| Earthquake Hazard Maps | U.S. Geological Survey (USGS) | Seismic considerations for structural and solar mounting work. |
| DSIRE incentives database | NC Clean Energy Technology Center | State and utility solar incentives and net-metering rules. |
National base costs
The starting point for each project is a national average built from current industry cost research, manufacturer and supplier pricing, and typical installed scopes — not a single source we can't verify. We express each project as a low, average, and high figure so the local estimate carries a realistic range, because two homes in the same city legitimately pay different amounts depending on size, materials, and complexity.
Real prices from homeowners
Data models are a strong starting point, but real receipts are better. Every cost page invites homeowners to report what they actually paid. Once enough verified submissions exist for a project in a city, we publish the reader median alongside our modeled estimate — so you can see how the data-driven number compares to what neighbors are paying. Submissions are moderated before they appear.
Our quality bar
Not every page meets our standard, and we'd rather publish fewer good pages than many thin ones. A city-and-project page is only indexed when it has complete local data — a valid price factor, local wage data, climate detail, and permit information — and enough substance to genuinely answer the question. Pages that fall short are held back rather than published as filler. We also keep clear lines between editorial and revenue: ads and quote referrals never influence the cost figures, which come only from the data above.
What these numbers are — and aren't
Our estimates are a well-sourced, locally-adjusted starting point to help you budget, sanity- check a bid, and understand what drives the price. They are not quotes, and they can't account for the specifics of your home. Always get multiple written quotes from licensed local contractors before making a decision. For legal, tax, or financial questions — solar tax treatment, for example — consult a qualified professional.
Frequently asked questions
- Are these prices quotes or guarantees?
- No. Every figure is an informational estimate based on public data and typical project scopes. Actual quotes depend on your specific home, materials, and contractor — always get at least three written bids.
- Where does the local price difference come from?
- From the BEA Regional Price Parities, the federal government's official measure of how much goods and services cost in one metro versus the national average. We apply that factor to a researched national base cost for each project.
- How current are the numbers?
- We review the national base costs and local factors at least once a year; the dataset was last reviewed January 2026. Cost-trend pages track year-over-year movement using BLS producer-price data.
- Do you take money to rank contractors?
- No. We don't rank or recommend specific contractors. When you request quotes we may share your request with vetted local pros, and we may earn referral or ad revenue — but that never changes the cost figures, which come only from data.