Garage Conversions: Quincy vs Wellesley
How do garage conversions rules compare between Quincy, MA and Wellesley, MA?
Wellesley has fewer restrictions than Quincy.
Quincy, MA
Norfolk County
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.
View full Quincy rules →Wellesley, MA
Norfolk County
Wellesley allows garage conversions to ADUs under Wellesley Zoning Bylaw §5.13 (as amended April 15, 2025 by Article 40.1) consistent with Section 8 of the Massachusetts Affordable Homes Act. Converted garage ADUs are by-right in Single Residence Districts with a building permit from the Inspector of Buildings and an annual Certificate of Compliance from the Planning Department.
View full Wellesley rules →Key Facts Comparison
| Fact | Quincy | Wellesley |
|---|---|---|
| Permit Required | Yes | - |
| ADU Rules Apply | If converting to ADU — max 900 sq ft | - |
| Building Code | 780 CMR for habitable space | - |
| Contact | Inspectional Services: (617) 376-1450 | - |
| Local Code | - | Wellesley Zoning Bylaw §5.13 |
| Approval | - | By-right (since 4/15/2025) |
| Max Size | - | 900 sq ft or 50% of primary |
| Permits | - | Building permit + annual Certificate |
| Setbacks (existing) | - | Grandfathered for conversion |
Highlighted rows indicate differences between cities.
Quincy FAQ
Can I convert my garage into living space in Quincy?
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.
What permits do I need for a garage conversion in Quincy?
Permit Required: Yes. ADU Rules Apply: If converting to ADU — max 900 sq ft. Building Code: 780 CMR for habitable space. Contact: Inspectional Services: (617) 376-1450.
Wellesley FAQ
Can I convert my Wellesley garage to a separate dwelling?
Yes, by-right since April 15, 2025. Wellesley Zoning Bylaw §5.13 (as amended by Article 40.1) and the Massachusetts Affordable Homes Act allow detached/attached garage conversions to ADUs without a Special Permit in Single Residence Districts.
How big can a Wellesley garage-conversion ADU be?
Up to 900 sq ft or 50% of the primary dwelling's gross floor area, whichever is smaller, under §5.13 and the MA Affordable Homes Act (G.L. c. 40A as amended).
What permits do I need for a Wellesley garage conversion?
A building permit from the Wellesley Inspector of Buildings (with HVAC, plumbing, and electrical sub-permits) and an annual Certificate of Compliance from the Wellesley Planning Department.
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