Cambridge's Inspectional Services Department at 831 Massachusetts Avenue permits and inspects construction for a city of about 123,000 built at Boston’s density but governed under the state Zoning Act rather than Boston's own code. Its distinguishing rule is energy: Cambridge adopted the Specialized Stretch Energy Code in January 2023 with effect from that July, in the very first group of municipalities, requiring new construction to meet high-performance standards, prepare buildings for all-electric heating and hot water, and make parking facilities ready for electric vehicles.
The department’s other distinction is procedural. Its online permitting system handles permit applications, renewals and communication with the inspectors. The office opens at 7:00 am: until 6:00 pm on Mondays, 3:30 pm Tuesday to Thursday and noon on Fridays, with the permit counter itself open in shorter windows within those hours.
This guide covers the City of Cambridge in Massachusetts. Boston, Somerville, Watertown, Arlington and Belmont each run their own departments. The Cambridge on the Chesapeake, in Dorchester County to the south, is an unrelated jurisdiction sharing only the name.
Specialized code, and early. Cambridge’s adoption of the Specialized code means new construction must meet high-performance standards, be pre-wired for all-electric systems where it uses fossil fuel, and make parking ready for electric vehicles. A new-build design brought over from a base-code or stretch-code town will not pass here. Additions, alterations and renovations follow the stretch code, as in any stretch-code town.
What requires a building permit in Cambridge?
What is local in Cambridge is the building department, the fee schedule, zoning, and the Specialized energy code and the department's digital portal.
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- New construction, which meets the Specialized code’s performance, electrification-readiness and electric vehicle requirements; additions, alterations and renovations follow the stretch code
- Any construction, reconstruction, alteration, repair, removal or demolition, and any change of use or occupancy
- Trade work — electrical, plumbing and gas — permitted separately under the state codes and inspected by the city's own inspectors
- New buildings, additions and any structural work on an existing building
- Alterations, repairs and reconstruction under the existing building provisions, and any change of use or occupancy
- Decks (except small, low, freestanding ones), sheds over 200 square feet at a one- or two-family home or 120 square feet elsewhere, swimming pools 24 inches deep or more, and solar installations
Often exempt
- Ordinary repairs that do not alter structure, egress or systems
- Ordinary repairs that do not alter structure, egress or systems
- Painting, wallpapering, flooring, cabinets and similar finish work
- Small items on the code’s exempt list, such as fences up to 7 feet and retaining walls up to 4 feet
- Work on a building owned by the Commonwealth, which the State Building Inspector enforces rather than the town
What is actually local, and what is not
The code is the Commonwealth's and cannot be amended locally. Cambridge's layer is the building department itself, its fee schedule and filing route, the zoning bylaw or ordinance and the zoning enforcement that precedes the permit, the conservation commission's wetlands jurisdiction under the Wetlands Protection Act, and the Specialized energy code the city adopted in the first wave and the digital permitting portal that issues its certificates.
Massachusetts has one State Building Code, 780 CMR, for every city and town; towns cannot rewrite it, though many opt into a stricter energy code. The trades run under their own state codes. Massachusetts rules
Who handles permitting in Cambridge?
The Inspectional Services Department is the enforcing office, with its building inspectors, wiring and plumbing inspectors and housing inspectors working from Massachusetts Avenue and through the city's online portal. The Community Development Department administers the zoning ordinance and the Specialized code programme, the board of zoning appeal hears relief under the state Zoning Act, the historical commission reviews designated properties and districts, and the conservation commission holds the wetlands jurisdiction.
| Detail | Information |
|---|---|
| Department | City of Cambridge Inspectional Services Department |
| Office | 831 Massachusetts Avenue, Cambridge, MA 02139 |
| Phone | (617) 349-6100 |
| Hours | Office Monday 7:00 am to 6:00 pm, Tuesday to Thursday 7:00 am to 3:30 pm, Friday 7:00 am to noon. Counter Monday 7:00–8:30 am and 3:30–5:30 pm; Tuesday to Thursday 7:00–8:30 am and 2:30–3:30 pm; Friday 7:00–8:30 am and 11:00 am to noon |
| Filing | City online permitting system for applications, renewals and communication with inspectors |
| Energy | Specialized Stretch Energy Code, adopted January 2023, effective July 1, 2023 |
Not sure this scope needs a permit?
Get a free quote →In 2025, building permits issued in Cambridge authorized 59 new privately owned housing units, 16 of them single-family homes, according to the U.S. Census Bureau Building Permits Survey.
Permit types
Residential permits
A Cambridge house or condominium project files through the portal against the state building code, the city's zoning ordinance and the Specialized energy code, with the supervising individual's Construction Supervisor Licence and the contractor's Home Improvement Contractor registration where the work is residential for an owner-occupant. A new house triggers the Specialized pathway, which is the single biggest design consequence of building in Cambridge rather than a neighbouring stretch-code town; additions and renovations follow the stretch code.
Commercial permits
Commercial, laboratory and institutional work in Cambridge — a city whose Kendall Square and university campuses generate a heavy permit load — runs through zoning and the Specialized code's commercial pathway, with the department's inspectors covering the trades. Applicants who work the city regularly file through the portal and communicate with the inspectors inside it rather than by telephone.
Zoning, conservation and the 30-day clock
The approvals that run ahead of the building permit are the local ones: zoning sign-off under Cambridge's bylaw or ordinance, and, where the work is within 100 feet of a wetland or within the riverfront or floodplain areas, an order of conditions from the conservation commission under the Wetlands Protection Act, which is a hearing rather than a counter transaction. In Cambridge the Community Development Department administers the zoning ordinance and the energy programme, the historical commission reviews the city's designated districts, and the conservation commission holds the Wetlands Protection Act jurisdiction along the Charles and Alewife Brook. Appeals from the building official go to the local zoning board of appeals on zoning matters and to the State Building Code Appeals Board on code matters.
Rather talk it over?
Call 1-855-478-4290 →Massachusetts has no general contractor licence: the supervising individual holds a Construction Supervisor Licence, and contractors working on existing owner-occupied homes register as Home Improvement Contractors. Massachusetts rules
Cambridge permit costs and fees
Fees follow the city's schedule, paid through the online portal, with trade permits charged separately under the state codes.
| Item | Fee or rule |
|---|---|
| Building permit | City schedule by project type and valuation, paid through the portal |
| Trade permits | Electrical, plumbing and gas permits filed separately and inspected by the city's inspectors |
| Renewals | Processed through the portal, with certificates issued digitally |
| Zoning relief | Board of zoning appeal application under the state Zoning Act |
| Conservation | Wetlands Protection Act filing fees where the work is in a resource area |
| Energy compliance | Specialized code documentation filed with the application |
The portal is the process. Cambridge runs applications, renewals and inspector communication through its online permitting system, and the counter is open only in short windows each day — the department’s expectation is that the portal, not the counter, is where the work happens.
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Get a free quote →Trade permits and who may pull them
Permit required
- New construction — Specialized code compliance documentation with the application
- Electrical — state-licensed electrician; separate wiring permit under 527 CMR 12
- Plumbing and gas — state-licensed plumber or gas fitter; separate permits under 248 CMR
- Sheet metal work — state sheet metal licence where the work falls under it
- Fire protection and alarms — fire department plan review through the building permit, plus any fire department permit under 527 CMR; alarms by a state-licensed systems contractor
Typically exempt
- Fixing a leaking faucet or valve, clearing a blocked drain, or adjusting gas appliance controls, which need no plumbing or gas permit
Trade work is permitted separately and inspected by the municipality’s own wiring and plumbing inspectors under the state codes. Massachusetts rules
How to apply for a Cambridge building permit
Zoning sign-off under the local bylaw or ordinance, and any variance or special permit the project needs, must come before the building permit.
Work in or near wetlands, rivers or land that floods needs conservation commission approval under the Wetlands Protection Act, usually an order of conditions, before work starts.
The Construction Supervisor Licence of the supervising individual, and the Home Improvement Contractor registration where the work is on an existing owner-occupied home of one to four units.
The building official reviews the documents against 780 CMR and the energy code the town has adopted.
Fees are the town's own and are due before issuance; trade permits are filed separately.
Footing to final, with the wiring and plumbing inspectors on their own trades, then a certificate of occupancy for a new building or change of use, or a certificate of completion for other work.
Review, corrections and what actually causes delay
Cambridge's building official acts on a complete application within 30 days under the state code, and the portal shows status throughout. What delays a file here is an energy submission built for the base or stretch code, zoning relief sought late, and communication attempted outside the portal.
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Get a free quote →Inspections in Cambridge
Inspections follow the code's sequence — footing and foundation, frame, insulation and final — with the wiring and plumbing inspectors covering their own trades, and are requested from the building department by permit number. Work that passes final receives a certificate of occupancy for new buildings and changes of use, or a certificate of inspection where the code requires one. Buildings in the use groups listed in 780 CMR Section 110 also carry periodic inspections, with proof of maintenance filed with the building official. Cambridge's building, wiring and plumbing inspectors carry the code's inspection sequence, scheduled and communicated through the portal; the certificate of occupancy follows the finals, and the department also runs the city's housing inspection function.
Cambridge permit search and official resources
- Cambridge Inspectional Services — the department, its portal and its hours
- Cambridge Specialized Stretch Energy Code — the city's adoption and what it requires
- Massachusetts State Building Code, 780 CMR — the 10th edition the department enforces
- Massachusetts State Building Code, 780 CMR — the 10th edition and its Massachusetts amendments from the Board of Building Regulations and Standards
- Home Improvement Contractor registration — the consumer-protection registration and Guaranty Fund
- Construction Supervisor Licence — the examined licence held by the individual supervising the work
Inspections are where schedules slip.
Get a free quote →Frequently asked questions
Which Cambridge is this?
Cambridge across the Charles from Boston. The Cambridge on the Chesapeake, in Dorchester County to the south, is an unrelated jurisdiction with its own building department.
Which energy code applies?
The Municipal Opt-in Specialized Stretch Energy Code, adopted in January 2023 and effective from July 1, 2023 — among the first adoptions in the Commonwealth.
Does the Specialized code reach renovations?
No. The Specialized code applies only to new construction. Additions, alterations and renovations follow the stretch code, which Cambridge first adopted in December 2009.
How do I file?
Through the city's online portal, which handles applications, renewals, communication with inspectors and digital certificate issuance.
When is the counter open?
The office opens at 7:00 am and closes at 6:00 pm on Mondays, 3:30 pm Tuesday to Thursday and noon on Fridays. The permit counter keeps shorter windows: Monday 7:00–8:30 am and 3:30–5:30 pm, Tuesday to Thursday 7:00–8:30 am and 2:30–3:30 pm, Friday 7:00–8:30 am and 11:00 am to noon.
Which building code edition applies?
The 10th edition of the Massachusetts State Building Code, 780 CMR, in effect since October 11, 2024 and the only code in force since July 1, 2025.
Simplify Cambridge permitting with Alliance Permitting
Cambridge asks for a harder energy design than its neighbours and makes everything else easier. We build the Specialized compliance into the drawings rather than bolting it on, file and correspond in the portal, and keep the renewal cycle inside it.
Ready to break ground in Cambridge sooner?
Send us the scope and the parcel. We confirm the review path with the Cambridge Inspectional Services Department, assemble the submittal, file it, and track it through issuance — corrections included.
More Massachusetts permitting guides
More Massachusetts permitting guides
This guide is provided by Alliance Permitting for general information about Cambridge permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.