ADU rules in Quincy, MA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Quincy allows ADUs by right under MGL c. 40A §3 and the 2024 Affordable Homes Act. One ADU per single-family lot is allowed as internal, addition, or detached unit. Maximum size is 50% of principal dwelling or 900 sq ft, whichever is less. Minimum size is 320 sq ft for detached units.
Under Quincy ZO and MGL c. 40A §3 (as amended by the 2024 Affordable Homes Act), one ADU is allowed by right on any owner-occupied single-family lot. The ADU may be: (1) within the existing dwelling, (2) an addition to the dwelling, or (3) a detached unit. Maximum floor area: the lesser of 50% of the principal structure's gross floor area or 900 sq ft. Minimum size for detached ADUs: 320 sq ft. No additional parking mandates, no owner-occupancy requirements beyond MGL c. 40A §3 compliance, and no architectural matching requirements. All units must meet 780 CMR (Massachusetts Building Code) and state plumbing code.
ADUs not meeting size, setback, or building code requirements are subject to zoning enforcement.
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Side-by-side rule comparisons with other cities in Norfolk County.
See how other cities in Norfolk County handle adu rules.
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