Accessory Structures in Lynn, MA (2026)
5 verified accessory structures rules for Lynn, Massachusetts, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Lynn allows one accessory dwelling unit by right on single-family lots, adopted February 11, 2025 under the state Affordable Homes Act. An ADU may not exceed 900 square feet or 50% of the main home's floor area.
Lynn ADU (Accessory Dwelling Unit) Rules
Some RestrictionsCity of Lynn Zoning Ordinance (adopted 2025-07-07), Section 9.B.2.a
By right. Subject to the requirements of this Ordinance, one accessory dwelling unit is allowed as of right on property located in a single-family residential zoning district, either within a principal dwelling or in a structure accessory thereto.
Shed Rules
Lynn does not require a building permit for a shed under 200 square feet. Larger structures need a permit. Sheds accessory to one- or two-family homes may not exceed 15 feet tall and must sit in the rear setback.
Lynn Shed & Outbuilding Rules
Few RestrictionsCity of Lynn Inspectional Services Department — Zoning/Building FAQ, Sheds
You do not need a building permit provided that the shed is less than two hundred square feet (200 ft2).
Garage Conversions
Converting a Lynn garage into living space requires a building permit under the MA Building Code (780 CMR). A conversion to a rentable unit must meet Lynn's ADU rules, and no garage may sit closer than the district's front setback.
Lynn Garage Conversion Rules
Some RestrictionsCarport Rules
A carport is an accessory structure in Lynn: it needs a building permit, may not exceed 15 feet tall on one- or two-family lots, and cannot sit in the required front or side setback — only the rear.
Lynn Carport Construction Rules
Some RestrictionsCity of Lynn Zoning Ordinance (adopted 2025-07-07), Section 4.5.c.i
In residential districts, no accessory structure shall be located within the required front or side setback but may be built in the rear setback.
Tiny Homes
Lynn bans tiny homes on wheels as dwellings — ADUs may not occupy RVs, campers, or structures on wheels. A tiny home on a permanent foundation must meet the MA Building Code and accessory-structure zoning limits.
Lynn Tiny Home & Small Dwelling Rules
Some RestrictionsCity of Lynn Zoning Ordinance (adopted 2025-07-07), Section 9.B.3.a
ADUs may not be located in temporary structures, mobile structures, campers, recreational vehicles (RVs), and other structures on wheels.
Looking for Essex County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Lynn city rules.
Accessory Structures in Essex County →