Accessory Structures in Fitchburg, MA (2026)
3 verified accessory structures rules for Fitchburg, Massachusetts, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
MA Affordable Homes Act (Ch. 150, Acts of 2024, §8), effective Feb 2, 2025 — ADUs allowed by right in single-family zones statewide, max 900 sq ft or 50% of principal dwelling GFA. Fitchburg Zoning Chapter 181 governs setbacks, height, and bulk. No owner-occupancy requirement.
Fitchburg ADU (Accessory Dwelling Unit) Rules
Some RestrictionsShed Rules
Sheds in Fitchburg are accessory uses permitted by right with residential uses under Zoning Chapter 181. Per the Massachusetts State Building Code (780 CMR 105.2, 9th edition), one-story detached accessory structures of 200 square feet or less do not require a building permit, but zoning setbacks in Chapter 181 still apply.
Shed Rules in Fitchburg
Some RestrictionsGarage Conversions
Converting a garage to habitable space in Fitchburg requires a building permit under 780 CMR (MA State Building Code) and an updated occupancy permit from the Building Commissioner under Zoning Chapter 181. Conversion to an Accessory Dwelling Unit triggers ADU zoning rules and may require Zoning Board of Appeals relief depending on the underlying district.
Garage Conversion Rules in Fitchburg
Some RestrictionsLooking for Worcester County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Fitchburg city rules.
Accessory Structures in Worcester County →