Shed permit rules in Chelsea, MA — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Accessory structures including sheds in Chelsea are governed by the Zoning Ordinance (Ch. 34) and 780 CMR (state building code). Permits required for structures over 120–200 sq ft or any structure with electrical/plumbing. Setback requirements vary by zoning district.
Under 780 CMR state building code, single-story structures under 120 square feet generally do not require a building permit. However, Chelsea's zoning code still requires compliance with setbacks, height limits, and lot coverage ratios. Given Chelsea's very small lot sizes in its dense urban environment, shed placement is often constrained by setback requirements. Larger sheds require building permits from inspectional services. Sheds cannot serve as dwelling units without proper ADU permitting.
Unpermitted sheds exceeding 120 sq ft face ISD enforcement. Setback violations require relocation or removal. Using a shed as living space is a serious violation.
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Side-by-side rule comparisons with other cities in Suffolk County.
See how other cities in Suffolk County handle shed rules.
See how Chelsea's shed rules rules stack up against other locations.
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