Cambridge building & ADU permits
Recent permit activity, updated continuously.
Cambridge sits across the Charles River from Boston and is home to Harvard and MIT. Under the 2024 Affordable Homes Act, ADUs are now allowed by right across Massachusetts; Cambridge publishes its new-construction permits under a public-domain (PDDL) license, which Igni ingests and classifies.
Igni is tracking 232 residential and building permits in Cambridge, MA — including 1 classified accessory-dwelling-unit (ADU) filing. The most active ZIP is 02138. The most recent filing Igni tracked was Sep 15, 2026. All records come from data.cambridgema.gov (Socrata), an official government open-data feed, and are refreshed continuously.
232
Permits tracked
1
ADU permits
5
Distinct ZIP codes
Sep 15, 2026
Newest permit
Recent permits
A sample of the freshest permits in this jurisdiction — ZIP and city only (no street addresses).
| ZIP | Permit type | ADU type | Valuation | Applied |
|---|---|---|---|---|
| 02140 | Residential | — | $2,703,997 | Aug 1, 2026 |
| 02141 | Residential | — | $2,268,600 | Jun 1, 2026 |
| 02139 | Residential | — | $850,000 | May 18, 2026 |
| 02139 | Residential | — | $850,000 | May 18, 2026 |
| 02138 | Residential | — | $1,000,000 | Dec 3, 2025 |
| 02138 | Residential | — | $1,080,000 | Dec 4, 2025 |
| 02139 | Residential | — | $2,300,000 | Apr 18, 2026 |
| 02139 | Residential | — | $2,100,000 | Apr 18, 2026 |
| 02140 | Residential | — | $1,878,675 | Jan 12, 2026 |
| 02141 | Residential | — | $2,200,000 | Mar 16, 2026 |
| 02141 | Residential | — | $266,900 | Feb 14, 2019 |
| 02139 | Residential | — | $437,612 | Apr 23, 2020 |
| 02140 | Commercial | — | $68,300,000 | Mar 20, 2019 |
| 02139 | Residential | — | $335,000 | Oct 20, 2020 |
| 02139 | Residential | — | $795,671 | Jun 29, 2026 |
| 02141 | Residential | — | $785,000 | Mar 1, 2026 |
| 02138 | Residential | — | $2,800,000 | Oct 30, 2025 |
| 02138 | Residential | — | $732,250 | Nov 10, 2025 |
| 02138 | Residential | — | $732,250 | Nov 10, 2025 |
| 02138 | Residential | — | $697,250 | Nov 10, 2025 |
Top ZIP codes by recent activity
Housing law — Massachusetts
Massachusetts legalized accessory dwelling units by right statewide through the Affordable Homes Act (2024); as of February 2025, an ADU up to 900 sq ft is allowed by right in single-family zoning districts in nearly every community, without an owner-occupancy requirement.
The MBTA Communities Act (2021) requires the 177 MBTA-served cities and towns to zone for multifamily housing as of right near transit; the state's highest court upheld the law as constitutional and enforceable in 2025.
Data source
Sourced from data.cambridgema.gov (Socrata). PDDL — public domain.
Nearby cities — Massachusetts
Learn more about ADUs & building permits
Background reading on accessory dwelling units, building permits, and how Igni turns Cambridge permit records into leads.
Cambridge permit data — FAQ
Where does Igni get Cambridge permit data?
How fresh is Cambridge permit data?
Does Cambridge allow accessory dwelling units (ADUs)?
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Informational only, not legal advice. Headline counts reflect all permits Igni has tracked for this jurisdiction; the table shows recent activity. Housing law changes — verify current statutes before relying on this.