ADU Rules: Wakefield vs Waltham
How do adu rules rules compare between Wakefield, MA and Waltham, MA?
Wakefield and Waltham have similar restriction levels.
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 →Waltham, MA
Middlesex County
Waltham must permit Accessory Dwelling Units by-right under the 2024 Massachusetts Affordable Homes Act (MGL c.40A s.3A). ADUs up to 900 sq ft are allowed on single-family lots without special permits.
View full Waltham rules →Key Facts Comparison
| Fact | Wakefield | Waltham |
|---|---|---|
| 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 | By-right, standard building permit |
| Governing law | - | MA Affordable Homes Act 2024 / MGL c.40A |
| Effective date | - | February 2, 2025 statewide |
| Max size | - | 900 sq ft or 50 percent of primary |
| Owner occupancy | - | Cannot be required |
Highlighted rows indicate differences between cities.
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.
Waltham FAQ
Can I build an ADU in Waltham without a special permit?
Yes. Since February 2025, ADUs up to 900 sq ft are allowed by-right on single-family lots under state law.
Can I Airbnb my Waltham ADU?
The state law allows cities to prohibit short-term rentals (under 30 days) of ADUs. Check Waltham's current short-term rental rules.
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