Permits in Cambridge, MA
We file solar, heat pump, mini-split and generator permits with Cambridge's Inspectional Services Department through its OpenGov portal, and handle the corrections and inspections.
Who issues permits
- Office
- City of Cambridge Inspectional Services Department (ISD)
- How filings are submitted
- Online Permitting System (OpenGov)
What residential jobs need in Cambridge
Solar
- Cambridge has a dedicated solar building permit on its OpenGov portal.
- Electrical permits are issued to Massachusetts licensed electricians.
Heat pumps and HVAC
- Heat pumps and ductless splits are filed as mechanical permits, which the city also uses for air conditioning.
- Building permits go to construction supervisors licensed by the City of Cambridge.
Standby generators
- Emergency generators are on the mechanical permit; gas work uses its own application.
For any trade not listed here, we confirm the requirements with the department during jurisdiction research, before we file.
Where filings stall
- Projects in historic or conservation districts go to the Cambridge Historical Commission, which adds a review step.
- Work started before the permit is issued is charged triple fees.
Massachusetts rules that apply
- Building work on one- and two-family homes has to be supervised by a Construction Supervisor License (CSL) holder or a registered design professional, and most work on existing owner-occupied homes also needs a Home Improvement Contractor (HIC) registration. Massachusetts does not recognize out-of-state contractor licenses.
- The state's one- and two-family building permit application asks for the CSL number, the HIC registration number and a workers' compensation affidavit. A permit is not issued without the affidavit.
- State guidance says installing a mini-split on a one- or two-family home triggers a building permit. A CSL is not needed for a basic install, but it is if building elements are cut or notched.
- Sheet metal work needs a licensed sheet metal worker and a permit from the local building department before work starts.
Sources
Checked October 2026 against the city's and state's own pages. Requirements change, so we confirm them again on every project.
- Cambridge: Apply for a building permit
- Cambridge: Building permits (all other)
- Cambridge: Electrical permits
- Cambridge: Electric, plumbing and gas permits
- Cambridge: Mechanical fees
- Mass.gov: When a Construction Supervisor License is required
- Mass.gov: Building permit application, one- or two-family dwelling
- Mass.gov: Mini-split permitting and licensing guidance
- Mass.gov: Sheet metal regulatory reminders
Send us the project.
You shouldn't have to become an expert in every city's permit process just to keep crews working.
$150 to file. $100 to run your inspections through final. City comments never billed, however many rounds.
Questions? Email us at permits@getpromatic.com
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