Garage Conversions: Holbrook vs Wellesley
How do garage conversions rules compare between Holbrook, MA and Wellesley, MA?
Wellesley has fewer restrictions than Holbrook.
Holbrook, MA
Norfolk County
Garage conversion rules in Norfolk County are set by each municipality through zoning bylaws and building codes. A building permit is required. The 2024 MA ADU law may facilitate some garage-to-ADU conversions by right.
View full Holbrook 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 | Holbrook | Wellesley |
|---|---|---|
| Building Permit? | Yes — required for all garage conversions | - |
| Code Compliance | 780 CMR — ceiling height, egress, insulation | - |
| ADU Conversion | May be by-right under 2024 Affordable Homes Act | - |
| Parking Impact | Check town zoning for off-street parking minimums | - |
| County Rule? | None — state code and municipal zoning | - |
| 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.
Holbrook FAQ
Can I convert my garage into living space in Norfolk County?
Garage conversion rules in Norfolk County are set by each municipality through zoning bylaws and building codes. A building permit is required. The 2024 MA ADU law may facilitate some garage-to-ADU conversions by right.
What permits do I need for a garage conversion in Norfolk County?
Building Permit?: Yes — required for all garage conversions. Code Compliance: 780 CMR — ceiling height, egress, insulation. ADU Conversion: May be by-right under 2024 Affordable Homes Act. Parking Impact: Check town zoning for off-street parking minimums.
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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