Garage Conversions: Brookline vs Wellesley
How do garage conversions rules compare between Brookline, MA and Wellesley, MA?
Wellesley has fewer restrictions than Brookline.
Brookline, MA
Norfolk County
Brookline's 2024 ADU bylaw amendment eliminates the prior 5-year age requirement for garage conversions to ADUs. Conversions require a building permit and must meet 780 CMR standards. Detached garage ADUs must comply with ZO §§ 5.63 and 5.72.
View full Brookline 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 | Brookline | Wellesley |
|---|---|---|
| 5-Year Rule | Eliminated by 2024 ADU amendment | - |
| Code Sections | ZO § 4.05; ZO §§ 5.63, 5.72 | - |
| Permit Required | Yes | - |
| Building Dept. | (617) 730-2090 | - |
| 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.
Brookline FAQ
Can I convert my garage into living space in Brookline?
Brookline's 2024 ADU bylaw amendment eliminates the prior 5-year age requirement for garage conversions to ADUs. Conversions require a building permit and must meet 780 CMR standards. Detached garage ADUs must comply with ZO §§ 5.63 and 5.72.
What permits do I need for a garage conversion in Brookline?
5-Year Rule: Eliminated by 2024 ADU amendment. Code Sections: ZO § 4.05; ZO §§ 5.63, 5.72. Permit Required: Yes. Building Dept.: (617) 730-2090.
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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