Accessory Structures in Norfolk County, MA (2026)

1 county-level rule, plus city-specific rules for 3 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.

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 ↗

Accessory Structures by City in Norfolk County

3 cities in Norfolk County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.

QuincyPop. 101,636

2 verified rules • ADU Rules, Shed & Carport Rules

BrooklinePop. 63,191

1 verified rule • Garage Conversions

WeymouthPop. 57,746

2 verified rules • ADU Rules, Garage Conversions

All Norfolk County ordinances

See every category we cover for Norfolk County: parking, noise, fences, fires, animals, pools, and more.

Norfolk County Ordinance Hub →