Land Use & Zoning
Massachusetts accessory dwelling unit (ADU) law (Chapter 40A, Section 3) requires municipalities to:
AProhibit ADUs in all single-family zones
BAllow accessory dwelling units as of right on lots with single-family homes, subject to certain size and other standards✓ Correct
CAllow ADUs only in multi-family zones
DRequire special permits for all ADUs
Explanation
Massachusetts Chapter 40A Section 3 (effective 2025) requires municipalities to allow accessory dwelling units (ADUs) as of right in all single-family residential districts, subject to size limits (no larger than half the main dwelling or 900 SF) and other standards.
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