Accessory Structures in Quincy, MA (2026)
4 verified accessory structures rules for Quincy, Massachusetts, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Quincy allows ADUs by right under MGL c. 40A §3 and the 2024 Affordable Homes Act. One ADU per single-family lot is allowed as internal, addition, or detached unit. Maximum size is 50% of principal dwelling or 900 sq ft, whichever is less. Minimum size is 320 sq ft for detached units.
Quincy ADU Rules
Few RestrictionsMass. Gen. Laws ch. 40A, § 3 (Accessory Dwelling Unit Provisions)
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
Quincy regulates sheds and accessory structures through its zoning dimensional regulations (Chapter 375 Section 4.0). Accessory structures must meet zoning setback requirements. Building permits are required for permanent structures.
Quincy Shed and Accessory Structure Rules
Some RestrictionsGarage Conversions
Garage conversions in Quincy require a building permit. If converting to living space or an ADU, the conversion must comply with Massachusetts Building Code (780 CMR), zoning setbacks, and ADU size rules under QZO and MGL c. 40A §3.
Quincy Garage Conversion Rules
Some RestrictionsCarport Rules
Quincy regulates carports as accessory structures under Quincy Code Chapter 196 (Zoning). Carports must comply with the dimensional and setback requirements of the underlying residence district set by Chapter 196 and obtain building permits from the Department of Inspectional Services under 780 CMR (Massachusetts State Building Code, Tenth Edition).
Carport Rules in Quincy
Some RestrictionsLooking for Norfolk County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Quincy city rules.
Accessory Structures in Norfolk County →