Accessory Structures in Attleboro, MA (2026)
4 verified accessory structures rules for Attleboro, Massachusetts, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
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.
Attleboro ADU (Accessory Dwelling Unit) Rules
Some RestrictionsMass. Gen. Laws ch. 40A, § 3 - Subjects which zoning may not regulate
No zoning ordinance or by-law shall prohibit, unreasonably restrict or require a special permit or other discretionary zoning approval for the use of land or structures for a single accessory dwelling unit, or the rental thereof, in a single-family residential zoning district; provided, that the use of land or structures for such accessory dwelling unit under this paragraph may be subject to re...
Shed Rules
Attleboro regulates accessory structures through its zoning ordinance. Building permits may be required depending on size. Structures must comply with zoning district setback requirements. The Planning & Development department handles zoning review.
Attleboro Shed & Outbuilding Rules
Some RestrictionsGarage Conversions
Garage conversions in Attleboro require building permits and must comply with the zoning ordinance and 780 CMR building code. Conversions to living space must meet residential code standards. ADU conversions may be allowed by right under the 2025 state law if under 900 sq ft.
Attleboro Garage Conversion Rules
Some RestrictionsMass. Gen. Laws ch. 40A, § 3A - MBTA communities multi-family zoning
An MBTA community shall have a zoning ordinance or by-law that provides for at least 1 district of reasonable size in which multi-family housing is permitted as of right; provided, however, that such multi-family housing shall be without age restrictions and shall be suitable for families with children. For the purposes of this section, a district of reasonable size shall: (i) have a minimum gr...
Carport Rules
Attleboro regulates carports as accessory structures under the City Zoning Ordinance (Chapter 17 of the City Code). Section 17-3.5(7) governs accessory use regulations. Carports must satisfy the dimensional and setback requirements of the underlying residence district (Single Residence SR or General Residence GR) and must sit on the same lot as the principal dwelling. Building permits are issued under 780 CMR (Massachusetts State Building Code) by Attleboro's Building Department.
Carport Rules in Attleboro
Some RestrictionsLooking for Bristol County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Attleboro city rules.
Accessory Structures in Bristol County →