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 Friday is the quietest day in Massachusetts permit records - and in one town it does not existhttps://masspermits.com/research/friday-permit-gapAcross 37,361 Massachusetts building permits from 31 municipal sources, Friday accounts for 12.8% 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 499 heating-system permits in the 10 Massachusetts towns whose records can answer, heat pumps are 35.5% of installations - and range from 20.0% to 46.7%.Tue, 18 Aug 2026 09:00:00 +0000https://masspermits.com/research/heat-pump-share We found 136 accessory-dwelling-unit permits in Massachusetts records - and the apparent boom is not realhttps://masspermits.com/research/adu-permits136 ADU permits across 18 Massachusetts towns. Raw monthly counts climb from 1 to 37, but normalized against the same sources the rate is flat. 25.0% mention a garage.Tue, 18 Aug 2026 09:00:00 +0000https://masspermits.com/research/adu-permits 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.Tue, 18 Aug 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.Tue, 18 Aug 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.Tue, 18 Aug 2026 09:00:00 +0000https://masspermits.com/research/corrections