ADU Rules in Newton, MA
Newton follows the Massachusetts state baseline with local regulations.
MEDIUM Confidence Data
MA
State Baseline: Affordable Homes Act
Up to 900 sq ft or 50% of principal dwelling (whichever is smaller). By-right approval statewide.
Zoning Districts
MR1 — Multi-Residence 1
Multi-family residential
| Type | Approval | Max Size | Height | Parking | Owner Occ. |
|---|---|---|---|---|---|
| Interior Conversion | By Right | 900 sq ft | — | None | No |
SR1 — Single Residence 1
Low-density single-family residential
Default Zone
| Type | Approval | Max Size | Height | Parking | Owner Occ. |
|---|---|---|---|---|---|
| Detached ADU | By Right | 900 sq ft | 15 ft | 1 space | No |
| Attached ADU | By Right | 900 sq ft | 25 ft | 1 space | No |
| Interior Conversion | By Right | 900 sq ft | — | None | No |
SR2 — Single Residence 2
Medium-density single-family residential
| Type | Approval | Max Size | Height | Parking | Owner Occ. |
|---|---|---|---|---|---|
| Detached ADU | By Right | 900 sq ft | 15 ft | 1 space | No |
| Interior Conversion | By Right | 900 sq ft | — | None | No |
SR3 — Single Residence 3
Higher-density single-family residential
| Type | Approval | Max Size | Height | Parking | Owner Occ. |
|---|---|---|---|---|---|
| Detached ADU | By Right | 900 sq ft | 15 ft | None | No |
| Interior Conversion | By Right | 900 sq ft | — | None | No |
Transit Stations
Properties near transit stations may qualify for parking exemptions.
Auburndale (CR)
COMMUTER RAIL
Eliot
SUBWAY
Newton Centre
SUBWAY
Newton Highlands
SUBWAY
Newtonville (CR)
COMMUTER RAIL
Waban
SUBWAY
West Newton (CR)
COMMUTER RAIL
Woodland
SUBWAY