ADU Rules in Brookline, MA
Brookline follows the Massachusetts state baseline with local regulations.
HIGH 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
S-10 — Single-Family S-10
Single-family residential, 10,000 sqft min lot
| 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 |
S-7 — Single-Family S-7
Single-family residential, 7,000 sqft min lot
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 |
T-5 — Two-Family T-5
Two-family residential district
| Type | Approval | Max Size | Height | Parking | Owner Occ. |
|---|---|---|---|---|---|
| Interior Conversion | By Right | 900 sq ft | — | None | No |
Transit Stations
Properties near transit stations may qualify for parking exemptions.
Beaconsfield
SUBWAY
Brookline Hills
SUBWAY
Brookline Village
SUBWAY
Chestnut Hill
SUBWAY
Coolidge Corner
SUBWAY
Reservoir
SUBWAY
Saint Paul Street (B)
SUBWAY
Washington Square
SUBWAY