ADU Rules in Fall River, MA
Fall River follows the Massachusetts state baseline with local regulations.
State Baseline Only
This page uses Massachusetts state baseline rules. Local setbacks, height limits, and other dimensional standards may vary. Contact your local building department for specifics.
State Baseline: Affordable Homes Act
Up to 900 sq ft or 50% of principal dwelling (whichever is smaller). By-right approval statewide.
Zoning Districts
RES — Default Residential
Default residential zone (state baseline only — specific district not yet researched)
| Type | Approval | Max Size | Height | Parking | Owner Occ. |
|---|---|---|---|---|---|
| Detached ADU | By Right | 900 sq ft | — | 1 space | No |
| Attached ADU | By Right | 900 sq ft | — | 1 space | No |
| Interior Conversion | By Right | 900 sq ft | — | None | No |
Transit Stations
Properties near transit stations may qualify for parking exemptions.
Fall River Depot
Building Department
Fall River Inspector of Buildings
1 Government Center, Fall River, MA 02720, USA
Phone: (508) 324-2500
Explore ADU Topics in Fall River
ADU Zoning in Fall River, MA
ADU Permit Process in Fall River, MA
ADU Costs in Fall River, MA
ADU Size Limits in Fall River, MA
ADU Setback Requirements in Fall River, MA
ADU Parking Requirements in Fall River, MA
ADU Types Explained in Fall River, MA
ADU Financing in Fall River, MA
ADU Timeline in Fall River, MA
ADU Property Value Impact in Fall River, MA
ADU Rental Income in Fall River, MA
Frequently Asked Questions
Are ADUs allowed by right in Fall River, MA?
Yes. ADUs in Fall River are approved by right — you submit your plans to the building department and receive a building permit without a public hearing or special permit process. This is guaranteed by the Affordable Homes Act.
What types of ADUs can I build in Fall River?
Fall River allows detached, attached, conversion ADUs. With up to 900 sq ft allowed, a detached ADU gives you the most flexibility for a full living space.
Do I need to live on the property to build an ADU in Fall River?
No. Fall River does not require owner occupancy — this is a right guaranteed by the Affordable Homes Act. You can rent both your main home and the ADU, making this a pure investment property if you choose.
How big can I build an ADU in Fall River, MA?
In Fall River, you can build an ADU up to 900 square feet or 50% of your home's living area, whichever is larger. With 900 sq ft, you have enough room for a full 2-bedroom cottage with a kitchen, bathroom, and living area. This is guaranteed by the Affordable Homes Act.
Does Fall River have historic district rules for ADUs?
Yes. Fall River has historically significant areas including Corky Row Historic District, Fall River Heritage State Park, Fall River Waterfront Cultural District, Lafayette-Durfee House, Maplecroft. If your property is in or near a historic district, your ADU design may require review by the local historical commission for architectural compatibility. This can affect timelines and design choices.
Can I rent out my ADU in Fall River?
Yes, long-term rentals are allowed for ADUs in Fall River. However, short-term rentals (like Airbnb) are not currently allowed for ADUs. With a population of 93,885, Fall River has strong rental demand.
How accurate is the ADU data for Fall River?
The information on this page reflects Massachusetts state baseline rules under the Affordable Homes Act. Fall River may have additional local requirements that differ from the state baseline. We recommend confirming with your local building department before starting your project.