ADU Rules in Worcester, MA
Worcester 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
RL-7 — Residential Limited 7
Limited residential, two-family allowed
| Type | Approval | Max Size | Height | Parking | Owner Occ. |
|---|---|---|---|---|---|
| Interior Conversion | By Right | 900 sq ft | — | None | No |
RS-10 — Residential Single-Family 10
Single-family residential, 10,000 sqft minimum
| 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 |
RS-7 — Residential Single-Family 7
Single-family residential, 7,000 sqft minimum
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 |
Transit Stations
Properties near transit stations may qualify for parking exemptions.
Worcester Bus Hub
BUS RAPID
Worcester Union Station
COMMUTER RAIL