Corrections & verification log

Every cost on this site is built from published federal data — wage series, material price indexes, regional adjustments. That claim is worth nothing unless we also publish the times we got a figure wrong. So this page lists them, with what it said, what it says now, and how long the error stood.

Everything in the first section was live on the site. Problems caught in review before publishing are not listed there; calling those “corrections” would flatter us and tell you nothing. Our corrections policy explains the standard, and this page is the record of it being kept.

Think a number is wrong? Email info@getwindowcost.com with the page and, if you price this work for a living, what you actually see in your market. Contractor corrections on regional labour are the most useful mail we get.

Corrections

Published figures that were wrong. Newest first.

1. July 23, 2026State pages — labour wage

   Where we hold no state-specific glazier wage, the model falls back to the national figure. State pages displayed that fallback without saying it was national, so a reader could take a national average for their own state's rate. The estimate was defensible; presenting it as local was not.

   Now reads: A national fallback wage is labelled as national wherever it is used

   Source: BLS Occupational Employment and Wage Statistics

Verification log

Checks of the data we publish, listed whether or not they found an error. A check that finds nothing is not a non-event — it is the only evidence that the checking happens at all.

1. July 27, 2026Glazier wages

   Re-ran the wage ingest against the newest Bureau of Labor Statistics occupational employment release.

   Result: Wages refreshed to the May 2025 series. Areas the BLS did not publish in the new release are held at their last published value rather than interpolated, and are marked as such.

2. July 15, 2026State and utility window rebates

   Verified every rebate programme we list, including whether the federal 25C credit still applies and whether each state programme rebates windows specifically or merely folds them into a whole-home retrofit.

   Result: The federal 25C credit is confirmed expired. Direct per-window rebates survive in only three states; eight programmes bundle windows into broader retrofits and two offer no window benefit at all. Several source links had gone dead and were re-found or flagged. The published asset was reframed around that finding rather than around the more attractive story we expected to tell.

3. June 7, 2026Material price index

   Refreshed the producer price index series behind material costs.

   Result: Current through April 2026.

Our estimates are a modelled starting point, not a bid. Prices move with local labour and material markets — always get multiple written quotes from licensed contractors for your specific project.