Research built on 37,361 Massachusetts building-permit records from 31 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. Six candidate findings were mined from this data and three survived checking. The other three are on the corrections page with the reason each was killed.
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.
Only a third of Massachusetts sources keep records capable of answering whether a heating replacement was a heat pump. Here is what those towns show - and why the rest had to be excluded.
ADU permits appear to be climbing steeply. Normalized against the same sources, they are not. A negative result, published as one.
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