Our goal is simple: give you a price range you can actually use when you talk to contractors. Here’s how every cost guide on Real Project Cost is built.
1. We start from multiple published sources
For each project we collect current installed-cost data from at least three established sources, such as national home-cost guides, manufacturer and retailer installation pricing, trade publications, and government data (for example ENERGY STAR and the U.S. Bureau of Labor Statistics for labor rates). Each guide lists the sources used at the bottom of the page.
2. We cross-check and build a realistic range
Sources rarely agree exactly, often because they include different things (unit only vs. full installation, permits, removal). We compare what each figure includes and publish a consensus range for a complete, professionally installed job, plus the typical price most homeowners pay. When sources disagree widely, we say so and explain why.
3. Our calculators use the same numbers
Each calculator combines the price components shown in the guide (materials, labor, common add-ons) and applies a regional adjustment. Regional factors are approximations based on differences in construction labor costs across U.S. regions; your local market can be higher or lower. With default settings, each calculator returns the typical price stated in the guide.
4. We review prices regularly
Material and labor prices change. Each guide shows the month its prices were last reviewed, and we recheck our guides at least once a year and whenever a major change (a tax credit ending, a price spike) affects them.
What our estimates are — and aren’t
Our figures are planning estimates, not quotes. The only way to know your exact price is to get written, itemized quotes from licensed local professionals. See our Disclaimer.