Accessory Structures in Weymouth, MA (2026)
4 verified accessory structures rules for Weymouth, Massachusetts, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Weymouth Town Council passed ADU Ordinance Amendment (Measure 24-119) adding Article 29 to Chapter 120. ADUs are allowed by right on single-family lots up to 900 sq ft or 50% GFA. Lots under 5,000 sq ft are ineligible.
Weymouth ADU Rules (2025 Ordinance)
Few RestrictionsMass. Gen. Laws ch. 40A, § 3 (Zoning Act — Statewide Protections for Accessory Dwelling Units and Residential Uses)
Section 3. No zoning ordinance or by-law shall regulate or restrict the use of materials, or methods of construction of structures regulated by the state building code, nor shall any such ordinance or by-law prohibit, unreasonably regulate, or require a special permit for the use of land for the primary purpose of commercial agriculture, aquaculture, silviculture, horticulture, floriculture or ...
Shed Rules
Weymouth's zoning ordinance requires accessory structures (other than private garages) to be located in the rear yard. A one-story accessory structure may be built no closer than 5 feet to a side or rear lot line.
Weymouth Shed and Accessory Structure Rules
Some RestrictionsGarage Conversions
Garage conversions to ADUs in Weymouth are permitted under the 2025 ADU ordinance (Article 29). Conversions require a building permit, Site Plan Approval, and design review. The converted ADU must comply with the 750–900 sq ft size limit and setback requirements.
Weymouth Garage Conversion Rules
Some RestrictionsMass. Gen. Laws ch. 40A, § 3A (MBTA Communities Multi-Family Zoning Act — Statewide Density Mandate Affecting Conversions of Existing Structures)
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.
Carport Rules
Weymouth treats carports more flexibly than most accessory structures. Under Weymouth Code § 120-54 (Confinement of accessory uses to rear yard), private garages and carports are explicitly exempted from the general rule that accessory uses must be confined to the rear yard - though they still may not be placed within the required front yard setback. Permits are issued by the Department of Municipal Licenses and Inspections under 780 CMR (Massachusetts State Building Code, Tenth Edition), and dimensional standards in Article XV of Chapter 120 control side and rear setbacks.
Carport Rules in Weymouth
Few RestrictionsLooking for Norfolk County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Weymouth city rules.
Accessory Structures in Norfolk County →