Cambridge Zoning & Land Use Guide
Notable local initiatives in Cambridge
Named ordinances, statutes, and reforms specific to Cambridge — each linked to an official source you can verify directly.
Citywide Multifamily Housing Zoning Petition (end of single-family-only zoning)(2025)
On February 10, 2025, the Cambridge City Council adopted the Citywide Multifamily Housing Zoning Petition, ending single-family-only zoning in every Cambridge neighborhood. The amendments permit residential buildings up to four stories as of right citywide, and up to six stories on lots of at least 5,000 sq ft that satisfy the city's inclusionary housing requirement (20% affordable units). Minimum lot size, maximum unit count, and maximum FAR caps on housing were eliminated.
Source · cambridgema.gov100% Affordable Housing Overlay (AHO)(2020)
The 100% Affordable Housing Overlay was adopted by the City Council in October 2020 and significantly amended in October 2023. It gives qualifying 100%-affordable developers (rentals ≥80% of units at ≤80% AMI, or for-sale ≥50% at ≤80% AMI) the as-of-right ability to build at greater height, density, and reduced setbacks/parking citywide. The 2023 amendments increased allowed heights (e.g., up to 13 stories on certain corridor lots).
Source · cambridgema.govMBTA Communities Act — Section 3A (rapid transit community)(2021)
Cambridge is designated a 'rapid transit community' under M.G.L. c. 40A § 3A because it is served by the MBTA Red Line (Alewife, Porter, Harvard, Central, Kendall/MIT). Rapid-transit communities faced the earliest compliance deadline (December 31, 2023) and must zone for as-of-right multi-family housing at a minimum gross density of 15 units/acre within designated districts.
Source · malegislature.govStatewide ADU by right — Affordable Homes Act §8(2024)
Chapter 150 of the Acts of 2024 (Affordable Homes Act), Section 8, amended M.G.L. c. 40A § 1A and § 3 to allow accessory dwelling units up to 900 sq ft (or 50% of the principal dwelling, whichever is less) as of right in single-family zoning districts statewide. The statewide ADU framework layers on top of Cambridge's already-permissive multifamily zoning regime.
Source · malegislature.gov
Key Zoning Facts
Regulatory Layers That Apply in Cambridge
Your property is subject to ALL of these regulatory layers. Each one can impose additional requirements beyond the others.
Federal
- FEMA flood mapping: check parcel-specific flood-zone status
- View FEMA Flood Map
State — Massachusetts
- Building Code: MA State Building Code (780 CMR, based on 2021 IBC)
- State ADU Override: Yes (MA ADU Law (2024) — requires single-family zones to allow ADUs by right)
County — Middlesex County
- Role: Property records, tax assessment, unincorporated area planning
City / Municipal
The municipality's zoning ordinance, building-code enforcement, and local permits form the primary local layer of land-use regulation for your property.
Overlay Districts
No overlay districts identified.
Private Restrictions
- Private covenants, deed restrictions, condominium rules, or association rules can impose requirements beyond zoning.
- Check HOA CC&Rs for additional restrictions.
Primary Zoning Districts
- Min Lot
- 6,000 sq ft
- Max Height
- 35 ft
- Front Setback
- 15 ft
- Side Setback
- 7.5 ft
- Rear Setback
- 25 ft
- Min Lot
- 2,500 sq ft
- Max Height
- 45 ft
- Front Setback
- 10 ft
- Side Setback
- 7.5 ft
- Rear Setback
- 20 ft
- Min Lot
- 2,500 sq ft
- Max Height
- 45 ft
- Front Setback
- 0 ft
- Side Setback
- 0 ft
- Rear Setback
- 10 ft
ADU Rules in Cambridge
- Max Size
- 900 sq ft
- Max Height
- 20 ft
- Rear Setback
- 5 ft
- Side Setback
- 5 ft
- Parking
- No additional parking required
- Owner Occupancy
- Not required under state ADU law
- Permit Timeline
- 60-90 days
Permit Costs & Timelines
Check Current Permit Fees & Timelines
Permit fees and review times can vary by project type, scope, valuation, and required approvals. Check the current schedule with the local permitting authority before filing.
Check current Cambridge permit information →Official Sources
City-specific