Accessory Structures in Norfolk County, MA (2026)

5 county-level rules, plus city-specific rules for 6 cities in Norfolk County, Massachusetts.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Norfolk County. If you live within an incorporated city, that city's own rules apply — see the city list below.

ADU Rules

Massachusetts 2024 Affordable Homes Act (MGL c. 40A §3) grants property owners the right to build ADUs on owner-occupied lots by right. Cities and towns cannot ban ADUs but may regulate size (up to 900 sq ft for internal ADUs). Norfolk County has no additional ADU rules.

Norfolk County ADU (Accessory Dwelling Unit) Rules

Few Restrictions

Full ordinance details →Official source ↗

Shed Rules

Shed rules in Norfolk County are set by individual municipalities through local zoning bylaws. Norfolk County has no county-level shed ordinance. Permit requirements, setbacks, and size limits vary by town.

Norfolk County Shed & Outbuilding Rules

Few Restrictions

Full ordinance details →Official source ↗

Garage Conversions

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.

Norfolk County Garage Conversion Rules

Some Restrictions

Mass. Gen. Laws ch. 40A, § 3A (MBTA Communities Multi-Family Zoning Act — Statewide Density Mandate Affecting Conversions of Existing Structures) (Massachusetts General Laws; applies to all cities/towns within the county)

Section 3A. (a)(1) 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.

Full ordinance details →Official source ↗

Carport Rules

Norfolk County has no carport rule. 780 CMR requires building permit. Setbacks governed by each town's zoning. Brookline and Quincy impose strict setback requirements; Weymouth is more permissive.

accessory-structures/carport-rules

Some Restrictions

Full ordinance details →Official source ↗

Tiny Homes

MA adopted IRC Appendix Q (tiny homes under 400 sq ft) into 780 CMR 9th Edition. Tiny homes on foundations must meet building code. Tiny Homes on Wheels (THOW) classified as RVs — mostly prohibited as permanent dwellings.