Do I need a permit for shed or accessory structure in Cambridge?
It depends. Whether shed or accessory structure needs a permit in Cambridge comes down to the details of your project.
The Massachusetts Residential Code exempts one-story detached accessory structures used as tool and storage sheds, playhouses, and similar uses with a floor area not over 200 square feet from a building permit (780 CMR 51.00 R105.2 item 1). A larger or habitable shed needs a building permit, and the state's guidance chart notes a construction supervisor license is needed for a shed over 200 square feet on a one- or two-family lot unless the homeowner exemption applies. The exemption is from the building code only; local zoning setbacks and any electrical permit still apply.
Documents you may need
- Building permit application for a shed over 200 square feetSometimes required
- Site plan showing the shed, property lines, and setbacksLikely required
- Floor area, height, and foundation detailsSometimes required
- Electrical permit if the shed will have powerSometimes required
Possible inspections
- Footing or foundation inspection where a building permit is issued
- Electrical inspection by the inspector of wires if wiring is added
- Final building inspection where a building permit is issued
Frequently asked questions
- Do I need a permit for shed or accessory structure in Cambridge?
- It depends. Whether shed or accessory structure needs a permit in Cambridge comes down to the details of your project. The documents and inspections sections on this page list what the building department typically asks for.
- Who issues the permit in Cambridge?
- The local building department for Cambridge handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
- How do I find out the exact requirements for my project?
- Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.
PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.