ADU Rules: Attleboro vs Fall River
How do adu rules rules compare between Attleboro, MA and Fall River, MA?
Attleboro and Fall River have similar restriction levels.
Attleboro, MA
Bristol County
Under Massachusetts law (Ch. 358 of Acts of 2024, effective Feb 2025), ADUs under 900 sq ft are allowed by right on single-family lots statewide, including Attleboro. ADUs must have a separate entrance and cannot exceed 900 sq ft or half the principal dwelling area. Both attached and detached ADUs are permitted.
View full Attleboro rules →Fall River, MA
Bristol County
Under Massachusetts law (Ch. 358 of Acts of 2024, effective Feb 2025), ADUs under 900 sq ft are allowed by right on single-family lots statewide. Fall River Mayor Coogan raised concerns about the law but it applies regardless. ADUs must have a separate entrance and cannot exceed half the principal dwelling's floor area or 900 sq ft.
View full Fall River rules →Key Facts Comparison
| Fact | Attleboro | Fall River |
|---|---|---|
| State Law | Ch. 358 Acts of 2024 — by right | Ch. 358 Acts of 2024 — by right |
| Max Size | 900 sq ft or 50% of principal dwelling | 900 sq ft or 50% of principal dwelling |
| Types | Attached, internal, or detached | - |
| Owner Occupancy | Cannot be required by municipality | Cannot be required by municipality |
| Effective Date | - | February 2, 2025 |
Highlighted rows indicate differences between cities.
Attleboro FAQ
Can I build an ADU on my property in Attleboro?
Under Massachusetts law (Ch. 358 of Acts of 2024, effective Feb 2025), ADUs under 900 sq ft are allowed by right on single-family lots statewide, including Attleboro. ADUs must have a separate entrance and cannot exceed 900 sq ft or half the principal dwelling area. Both attached and detached...
What are the size limits for an accessory dwelling unit in Attleboro?
State Law: Ch. 358 Acts of 2024 — by right. Max Size: 900 sq ft or 50% of principal dwelling. Types: Attached, internal, or detached. Owner Occupancy: Cannot be required by municipality.
Fall River FAQ
Can I build an ADU on my property in Fall River?
Under Massachusetts law (Ch. 358 of Acts of 2024, effective Feb 2025), ADUs under 900 sq ft are allowed by right on single-family lots statewide. Fall River Mayor Coogan raised concerns about the law but it applies regardless. ADUs must have a separate entrance and cannot exceed half the...
What are the size limits for an accessory dwelling unit in Fall River?
State Law: Ch. 358 Acts of 2024 — by right. Max Size: 900 sq ft or 50% of principal dwelling. Effective Date: February 2, 2025. Owner Occupancy: Cannot be required by municipality.
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