Research built on 80,002 Massachusetts building-permit records from 77 municipal sources. Every figure on these pages is recomputed from the live dataset each time the site is built, and every article publishes the rule it used, the sources it excluded, and a downloadable file of its own numbers.
Three articles, not thirty. 8 candidate findings were mined from this data and 3 survived checking. The other 4 are on the corrections page with the reason each was killed - along with 3 claims that were published and then corrected.
Friday carries barely half the permits of any other weekday - and one town has never recorded a single one. What that says about how towns keep records.
ADU permits appear to be climbing steeply. Normalized against the same sources, they are not. A negative result, published as one.
At addresses that file more than one trade, some trades reliably arrive weeks after another. Which ones, how long the gap is, and which apparent sequences are really one job filed twice.
Exact addresses, contractor details, and a sortable file — plus a free sample so you can see the quality first.
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MassPermits. “Research - original analysis of Massachusetts permit data”. Updated 2026-09-27. https://masspermits.com/research/
Method: https://masspermits.com/research/methodology · Corrections: https://masspermits.com/research/corrections · Licence: CC BY-NC 4.0