Shed permit rules in Somerville, MA β also referred to as storage shed, backyard shed, or accessory building regulations β set size limits, setbacks, and when a building permit is required.
Sheds under 200 square feet typically do not need a building permit in Somerville but must meet zoning setbacks. Larger sheds require a building permit from Inspectional Services.
Under the Massachusetts State Building Code (780 CMR), one-story detached accessory structures used as tool and storage sheds and not exceeding 200 square feet are exempt from building permit requirements, but they must still comply with local zoning. Somerville zoning typically requires rear yard accessory structures to be at least 3 feet from side and rear property lines, at least 10 feet from any dwelling, and no more than 15 feet tall. Sheds in front yards are generally prohibited. Sheds with electrical service need an electrical permit, and those with plumbing need a plumbing permit regardless of size. Lot coverage and impervious surface limits still apply. Sheds on concrete slabs may count toward impervious surface.
Contact your local code enforcement office for specific penalty information.
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