Boston Zoning & Land Use Guide
Last updated: Verified:
Key Zoning Facts
Regulatory Layers That Apply in Boston
Your property is subject to ALL of these regulatory layers. Each one can impose additional requirements beyond the others.
Federal
- FEMA Flood Zones: Applicable
- 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 — Suffolk County
- Role: Property records, tax assessment, unincorporated area planning
City / Municipal
The city's zoning ordinance, building codes, and local permits form the primary layer of land-use regulation for your property.
Overlay Districts
No overlay districts identified.
Private Restrictions
- HOA / CC&Rs common: Yes
- Check HOA CC&Rs for additional restrictions.
Primary Zoning Districts
| District Code | Name | Min Lot | Max Height | Front Setback | Side Setback | Rear Setback | FAR |
|---|---|---|---|---|---|---|---|
| 1F | Single-Family Residential | 5,000 sq ft | 35 ft | 15 ft | 10 ft | 20 ft | — |
| 2F | Two-Family Residential | 4,000 sq ft | 35 ft | 15 ft | 8 ft | 20 ft | — |
| LC | Local Commercial | 2,500 sq ft | 40 ft | 0 ft | 0 ft | 10 ft | — |
ADU Rules in Boston
ADUs:Allowed
- 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
Official Sources
Frequently Asked Questions
Frequently Asked Questions
Can I build an ADU in Boston?
Yes. Under the 2024 Massachusetts ADU law, single-family zones statewide must allow ADUs by right. Boston has adopted compliant regulations permitting ADUs up to 900 sq ft.
How do I find the zoning for my property in Boston?
Use the Boston Zoning Maps portal on the city's planning department website or contact the Boston Planning & Development Agency for parcel-specific zoning information.
What zones allow multi-family housing in Boston?
Multi-family housing is permitted in 3F (Three-Family), MFR (Multi-Family Residential), and various mixed-use and community commercial districts.
Disclaimer: The information on this website is provided for general informational purposes only and does not constitute legal, financial, or professional advice. Zoning codes and building regulations change frequently. Always verify current requirements with your local planning department and building authority before making any decisions.