ADU rules in Suffolk County, MA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
ADUs are now allowed by right statewide under MA Affordable Homes Act (Ch. 150, Acts of 2024, §8, effective Feb 2, 2025). No county-level ADU authority. Each Suffolk County city must comply. Max 900 sq ft or 50% of principal dwelling. Cities cannot require owner-occupancy for protected ADUs.
The Affordable Homes Act (effective February 2, 2025) allows one ADU by right on single-family lots everywhere. Max 900 sq ft or 50% of principal dwelling. No owner-occupancy or special permits required. Near MBTA stations no parking needed. Each city processes permits through its building department.
Building permits required. Non-compliant ADUs face local enforcement.
Suffolk County, MA
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See how Suffolk County's adu rules rules stack up against other locations.
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