Administrative overview · FIPS 25017
Middlesex County permit authority
The first compliance decision is jurisdictional: identify the office with statutory authority over your parcel, then use its filing and inspection sequence to keep the project moving.
Jurisdictional status
Municipal Fallback
This profile identifies a handoff outside the county’s ordinary structural permitting lane.
Required jurisdiction check
Confirm the controlling local or state authority before filing.
The record is marked Municipal Fallback. That means the county profile should be treated as a routing brief: incorporated municipalities, a state building department, or a state fire marshal may control plan review, permits, and inspections. Contact the named agency below and verify the parcel’s jurisdiction before paying a fee or scheduling field work.
Responsible agency
City of Cambridge Inspectional Services Department (representative municipal fallback)
For a project in or near Middlesex County, this office is the identified point of contact for permit intake, statutory code enforcement, plan review coordination, and inspection release conditions. Confirm the parcel’s boundary and project type before relying on the county lane.
Direct contact
617-349-6100
Call before mobilizing if the project has a boundary, occupancy, fire, septic, or utility question.
Permit counter
831 Massachusetts Avenue, 1st Floor, Cambridge, MA 02139
Operating hours
Monday 7:00 AM-6:00 PM; Tuesday-Thursday 7:00 AM-3:30 PM; Friday 7:00 AM-noon. Counter sessions: Monday-Thursday 7:00-8:30 AM, Monday 3:30-5:30 PM, Tuesday-Thursday 2:30-3:30 PM, and Friday 7:00-8:30 AM and 11:00 AM-noon.
Review expectation
The online process instructions state that the 30-day approval period begins after required pre-approvals and payment; complete applications are reviewed by ISD and other required departments before payment and conversion to a building permit application.
Compliance workbench
Choose the next project decision.
Apply online
Open the verified digital gateway, application form, and review timeline.
Open guide →Fees & penalties
Understand fee schedules, enforcement exposure, and stop-work liabilities.
Open guide →Codes & exemptions
Read the code framework, minor-work exemptions, and inspection lane.
Open guide →Agency website
Visit the primary public source for current notices and contact changes.
Open guide →Source trail
Official sources for this profile
Use these direct agency or licensing links to confirm current instructions before you file, pay, or schedule work. External pages control if their information differs from this directory.
Project questions
Frequently asked questions for Middlesex County
Who handles permitting for this jurisdiction?
This record is marked Municipal Fallback. Confirm whether a city, state agency, or other local authority controls the parcel before filing.
How should I begin an application?
Begin with the online permit gateway listed in the application guide. If the portal does not recognize the address or project type, contact 617-349-6100.
How long might review take?
The online process instructions state that the 30-day approval period begins after required pre-approvals and payment; complete applications are reviewed by ISD and other required departments before payment and conversion to a building permit application.
How are inspections scheduled?
The official pages reviewed do not publish a separate online inspection-booking form. After permitting, contact Cambridge Inspectional Services at 617-349-6100 or use the online permitting system for permit-related instructions; inspectors work through the Building, Electrical, Plumbing/Gas and other ISD divisions. Permits must be posted at the job site.
Which codes and exemptions should I review?
Massachusetts State Building Code 780 CMR Tenth Edition (applications from January 1, 2025 onward), Massachusetts Electrical, Gas, Plumbing, Mechanical, Housing and Sanitary Codes, 521 CMR accessibility regulations, Cambridge Zoning Ordinance, and Cambridge's Fossil Fuel-Free Ordinance for new construction and major renovation. Cambridge adopted the Stretch Energy Code effective July 1, 2010. Cambridge's official FAQ states that ordinary repairs as defined by the Building Code do not require a building permit, and a shed under 120 square feet does not require a building permit, although zoning still applies to sheds of any size. Construction, alteration, repair or demolition of structures and installation of signs otherwise require a permit before work begins; electrical, plumbing, gas and other specialized permits may still be required.