ADU Rules in Lowell, MA
Lowell 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
SR — Suburban Residential
Low-density suburban 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 |
TR — Traditional Residential
Traditional neighborhood residential
| Type | Approval | Max Size | Height | Parking | Owner Occ. |
|---|---|---|---|---|---|
| Interior Conversion | By Right | 900 sq ft | — | None | No |
UR — Urban Residential
Medium-density urban 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.
Gallagher Transit Terminal
BUS RAPID
Lowell Station
COMMUTER RAIL