Sources we use

The list, in numbers

241 distinct sources from 64 publishers, cited across 81 calculators — most recently verified 2026-09. The full list was hand-checked against the live pages in September 2026; each entry below shows the publisher, the month we accessed it, and how many calculators rely on it.

How we work with sources

• Every cost constant traces to a published page we actually read. The parenthetical in each citation names the data points that source establishes (for example, “$1–$3 per sq ft of wall”).
• Calculators combine these bands into a model, then show a low–typical–high range rather than a single price. A range is a planning estimate — never a quote.
• Each source carries an asOf month. Prices move; we re-verify the cost data quarterly and note the access month so you can judge how fresh it is.
• When only one published source exists for a figure, the calculator's methodology section says so instead of dressing a single data point up as a consensus.
• We don't accept paid placements in editorial cost data, and we don't invent expert names or ratings — this work is maintained by the FixTally Editorial Team.