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Massachusetts — M.G.L. c.40A §3A ADUs allowed

ADUs allowed by-right in single-family zones under 2024 MBTA Communities Act amendments.

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PDF export from MLS PIN, assessor record, or full-print sheet — fields auto-parsed, you confirm before analysis runs

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Manual Entry

Type property details directly. Good for phone calls, open houses, or off-MLS properties.

Always works

Re-check a Property

Load a previously saved property from your dashboard and re-run under updated zoning rules.

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MLS Format Guide

Supported Formats

MLSPin (MA)
Statewide MLS (RI)
MLS1 (RI)
Bright MLSpartial
CT MLSpartial
Custom / printoutmanual confirm

Fields that drive ADU scoring

  • ·Street address + city/town
  • ·Lot size (acres or sqft)
  • ·Zoning code
  • ·Sewer type (public / septic / cesspool)
  • ·Water type (public / private)
  • ·Garage count
  • ·Basement (yes/no, finished/unfinished)
  • ·Bedrooms / bathrooms
  • ·Year built
  • ·Living area (sqft)

Sewer type is critical

Septic or cesspool properties have a different ADU pathway under MA Title 5. Always confirm before advising your buyer.