Building Permits in Cambridge, MA
Check permit requirements for home improvement projects in Cambridge. Select a project type below to see local requirements, estimated fees, and how to apply.
Recent permit activity in Cambridge
We track 9,328 permit records from Cambridge's official open-data feed, updated 7 days ago. Filed by 3,490 different contractors.
Thinking about a project? Check what permits have already been pulled on a property — data is current to 7 days ago. Useful for buyers vetting a listing, or homeowners curious about their neighbors' renovations.
Key Exemptions in Cambridge
These projects typically don't require a building permit in Cambridge:
Cosmetic bathroom renovations (paint, tile, fixtures in same location) do not require a permit in Cambridge, MA.
Small at-grade patio slabs under 120 square feet are typically exempt from building permits per IRC R105.2 (extended via local amendment). The slab must be at-grade (not more than 30 inches above adjacent grade) and not part of an accessible route.
Freestanding decks not exceeding 30 inches above grade do not require a building permit in Cambridge, MA.
Replacing an existing driveway in the same footprint with no changes to the curb cut is generally exempt from permit requirements.
Replacing a light fixture or outlet in-kind does not require an electrical permit in Cambridge, MA.
See all rules by selecting a project type below, or use our free lookup tool for a personalized answer.
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Cambridge Building Department
Nearby Cities in Massachusetts
Permit Guides
Read our in-depth guides for common home improvement projects: