MassPermits Research https://masspermits.com/research/ Original analysis of Massachusetts building-permit records. Every figure recomputed from the live data, with the method published alongside.en-us What 31 Massachusetts towns publish in their permit recordshttps://masspermits.com/research/coverageEvery one of the 31 Massachusetts municipal sources behind MassPermits, what each publishes, and what it does not - 20 publish no project value and 2 publish coordinates.Sun, 06 Sep 2026 09:00:00 +0000https://masspermits.com/research/coverage Methodology - how MassPermits measures Massachusetts permit datahttps://masspermits.com/research/methodologyHow MassPermits collects Massachusetts building-permit records, how work is classified, what is deliberately withheld, and the four rules every research page on this site follows.Sun, 06 Sep 2026 09:00:00 +0000https://masspermits.com/research/methodology Corrections and rejected analyseshttps://masspermits.com/research/correctionsCorrections and rejected analyses. Every figure MassPermits computed, verified and then declined to publish, with the reason it did not survive.Sun, 06 Sep 2026 09:00:00 +0000https://masspermits.com/research/corrections What permit follows what in Massachusetts, and how long afterhttps://masspermits.com/research/permit-sequenceAcross 6,670 Massachusetts addresses that filed more than one trade, 10 pairs of trades run reliably one way. A kitchen/bath permit is followed by electrical 84% of the time, a median 18 days later.Thu, 20 Aug 2026 09:00:00 +0000https://masspermits.com/research/permit-sequence Friday is the quietest day in Massachusetts permit records - and in one town it does not existhttps://masspermits.com/research/friday-permit-gapAcross 37,571 Massachusetts building permits from 31 municipal sources, Friday accounts for 13.0% of dated records against roughly 22.2% on Tuesday. In Hingham it is zero.Tue, 18 Aug 2026 09:00:00 +0000https://masspermits.com/research/friday-permit-gap We could only answer the heat-pump question in 10 of 31 Massachusetts townshttps://masspermits.com/research/heat-pump-shareAcross 550 heating-system permits in the 10 Massachusetts towns whose records can answer, heat pumps are 31.1% of installations - and range from 13.8% to 44.2%.Tue, 18 Aug 2026 09:00:00 +0000https://masspermits.com/research/heat-pump-share We found 141 accessory-dwelling-unit permits in Massachusetts records - and the apparent boom is not realhttps://masspermits.com/research/adu-permits141 ADU permits across 17 Massachusetts towns. Raw monthly counts climb from 4 to 37, but normalized against the same sources the rate is flat. 22.7% mention a garage.Tue, 18 Aug 2026 09:00:00 +0000https://masspermits.com/research/adu-permits