Garage conversion rules in Quincy, MA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Garage conversions in Quincy require a building permit. If converting to living space or an ADU, the conversion must comply with Massachusetts Building Code (780 CMR), zoning setbacks, and ADU size rules under QZO and MGL c. 40A §3.
Converting a garage to living space or an ADU in Quincy requires a building permit from the Department of Inspectional Services. ADU conversions must meet the 50%/900 sq ft maximum, comply with 780 CMR for habitable space requirements (insulation, egress, plumbing, electrical), and be consistent with zoning. If the garage is detached, it must meet the 320 sq ft minimum ADU size. Parking elimination must be accounted for, though no additional parking is required for ADUs under the 2024 Affordable Homes Act.
Unpermitted garage conversions are subject to stop-work orders and may require restoration to original use.
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Side-by-side rule comparisons with other cities in Norfolk County.
See how other cities in Norfolk County handle garage conversions.
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