{
 "slug": "adu-permits",
 "computed_from": "masspermits.com build",
 "corpus_fetched_at": "2026-08-18T09:33:48.710994+00:00",
 "corpus_rows": 37361,
 "corpus_sources": 31,
 "corpus_first": "2026-02-19",
 "corpus_last": "2026-08-18",
 "method": {
  "heat_pump": "heat\\s*pump|mini[\\s-]?split|minisplit|ductless|\\bashp\\b",
  "fossil": "\\bfurnace(s)?\\b|\\bboiler(s)?\\b|forced hot air|\\bgas heat\\b|oil burner",
  "adu": "\\baccessory dwelling|\\badu\\b|in[- ]law (apartment|suite)|accessory apartment",
  "min_desc_chars": 8,
  "min_heating_rows": 20,
  "min_gas_distinctness": 0.5,
  "min_weekday_rows": 100,
  "min_calendar_fridays": 6
 },
 "guards": {
  "adu_rows": [
   60,
   null
  ],
  "adu_towns": [
   8,
   null
  ],
  "garage_share": [
   10.0,
   45.0
  ],
  "n_months": [
   4,
   null
  ]
 },
 "stats": {
  "adu_rows": 136,
  "adu_towns": 18,
  "eligible_sources": 20,
  "n_sources": 31,
  "garage": 34,
  "garage_share": 25.0,
  "pooled_rate": 47.8,
  "raw_first": 1,
  "raw_peak": 37,
  "rate_min": 30.8,
  "rate_max": 72.0,
  "n_months": 7,
  "series": [
   {
    "month": "2026-02",
    "raw": 1,
    "base": 310,
    "rate": 32.3
   },
   {
    "month": "2026-03",
    "raw": 4,
    "base": 1300,
    "rate": 30.8
   },
   {
    "month": "2026-04",
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    "base": 2082,
    "rate": 72.0
   },
   {
    "month": "2026-05",
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    "base": 4477,
    "rate": 62.5
   },
   {
    "month": "2026-06",
    "raw": 37,
    "base": 7078,
    "rate": 52.3
   },
   {
    "month": "2026-07",
    "raw": 37,
    "base": 9814,
    "rate": 37.7
   },
   {
    "month": "2026-08",
    "raw": 14,
    "base": 3372,
    "rate": 41.5
   }
  ],
  "town_list": [
   "Amherst, MA",
   "Barnstable, MA",
   "Braintree, MA",
   "Cambridge, MA",
   "Chatham, MA",
   "Falmouth, MA",
   "Hanson, MA",
   "Hingham, MA",
   "Lexington, MA",
   "Mansfield, MA",
   "Milton, MA",
   "Plymouth, MA",
   "Randolph, MA",
   "Reading, MA",
   "Rockland, MA",
   "Taunton, MA",
   "West Bridgewater, MA",
   "Worcester, MA"
  ]
 }
}