How we get our prices

Data version November 2026 · 27 category×state datasets across 3 states

Every calculator on CostLoft runs on the same pipeline, and every page lists the exact sources behind its numbers. This page explains how the data is built so you can judge it for yourself.

The rules

  1. Dual-source where possible. A state price tier counts as “verified” only when at least two independent 2025–2026 cost guides produce overlapping ranges. Single-source numbers are labeled “partial”, and values derived from national data are labeled “estimated” — on the page, not in the fine print.
  2. Metro aggregation, honestly labeled. Published contractor prices are usually city-level. Our state tiers aggregate the 2–3 largest metros, and the metro breakdown is shown on each state page.
  3. Low / mid / high, never one number. Tiers reflect real quote spreads (basic build vs. mid-grade vs. premium/complex), because that spread is what you'll actually see from contractors.
  4. Installed prices by default. Unless a line says “materials only”, our unit prices include labor. DIY savings estimates always cite the labor share.
  5. Quarterly refresh with a paper trail. Prices are re-checked every quarter; each page carries its update badge, and material price changes are logged.

What this is not

CostLoft is not a contractor, does not verify contractor credentials, and does not sell leads quietly. Our estimates are planning tools — estimates are for planning purposes only. actual prices vary by project details — always confirm with on-site quotes from licensed contractors.

Coverage

Questions about a specific number? Every calculator page lists its sources with retrieval dates — start there, then read about us.