ADU Rules: Cambridge vs Wakefield
How do adu rules rules compare between Cambridge, MA and Wakefield, MA?
Cambridge and Wakefield have similar restriction levels.
Cambridge, MA
Middlesex County
Cambridge allows accessory dwelling units by right under the 2024 MA Affordable Homes Act and MGL c.40A s.3A, the statewide ADU mandate. Most residential districts now permit one ADU by right.
View full Cambridge rules →Wakefield, MA
Middlesex County
Wakefield adopted a local Accessory Dwelling Unit zoning bylaw at the May 2025 Annual Town Meeting to comply with Massachusetts' Affordable Homes Act (Chapter 150 of the Acts of 2024, Section 8), which took effect statewide February 2, 2025. The state law amends G.L. c. 40A and allows ADUs up to 900 sq ft (or 50% of the primary dwelling, whichever is smaller) by-right in all single-family zoning districts.
View full Wakefield rules →Key Facts Comparison
| Fact | Cambridge | Wakefield |
|---|---|---|
| State law | MGL c.40A s.3A Affordable Homes Act | - |
| By-right status | Yes on single-family lots | - |
| Max size | 900 sq ft or half primary unit | - |
| Owner occupancy | Cannot be required | - |
| Historic districts | Extra commission review | - |
| State Code | - | G.L. c. 40A; Affordable Homes Act §8 |
| Effective Date | - | February 2, 2025 (statewide) |
| Local Bylaw | - | Adopted May 2025 ATM |
| Max ADU Size | - | 900 sq ft or 50% of primary |
| Approval | - | By right; no special permit |
Highlighted rows indicate differences between cities.
Cambridge FAQ
Can I build an ADU in my Cambridge backyard without a special permit?
Yes in most cases. Under the 2024 state law it is by-right up to 900 sq ft, subject to zoning review.
Can Cambridge require me to live on site if I build an ADU?
No. The state law prohibits owner-occupancy mandates for ADUs.
Wakefield FAQ
Are ADUs allowed by-right in Wakefield?
Yes. Under Section 8 of the Massachusetts Affordable Homes Act (effective February 2, 2025) and Wakefield's local bylaw adopted at the May 2025 Annual Town Meeting, one ADU up to 900 sq ft is allowed by-right in any zoning district that allows single-family dwellings.
How big can a Wakefield ADU be?
Up to 900 sq ft, or 50% of the primary dwelling's gross floor area, whichever is smaller, under the state law amending G.L. c. 40A. The ADU must have a separate entrance and meet the State Building Code (780 CMR).
Can Wakefield require owner-occupancy or a special permit?
No. The Affordable Homes Act prohibits municipalities from requiring owner-occupancy or a special permit/variance for ADUs in single-family zones, though objective dimensional and short-term-rental restrictions are allowed.
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