Methodology
Last reviewed June 2026. Anyone using a cost calculator deserves to see the math behind the numbers.
Where the baselines come from
We start from publicly cited 2024 to 2026 contractor surveys, manufacturer wholesale price lists, and trade association job reports (Roofing Contractors, ACCA, AGCA, PHCC). For each trade we publish a national low, typical, and high price per unit. The unit is whatever the trade is actually quoted in: square feet for roofs, system tons for HVAC, gallons for water heaters, and per-job for foundation repair.
How regional multipliers work
Every state has a multiplier that captures local labor wages, permit costs, and supply prices relative to the US average (1.00). Metros override states because urban premiums are real and large. A San Jose roof costs more than a Sacramento roof, which costs more than the California state average.
What we don't do
We don't invent statistics. We don't publish fake author bios or fabricated reviews. We don't ship calculators that pretend to know your exact quote: the output is a range, every time. If a contractor in your market quotes outside our band, that is useful signal, not a bug.
How often we update
Cost data is reviewed quarterly. Major equipment categories (HVAC and tankless water heaters) get a mid-cycle review when manufacturers post price increases. The "last reviewed" date in the footer is the single source of truth.
What you should do with the numbers
Use them as a sniff test before your first contractor visit. If three quotes cluster inside our typical band, the market is functioning. If one is half and one is double, ask both contractors to explain. Walk away from the one that can't.