ADU Rules in Plainville, MA
Plainville 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 |
Building Department
Explore ADU Topics in Plainville
ADU Zoning in Plainville, MA
ADU Permit Process in Plainville, MA
ADU Costs in Plainville, MA
ADU Size Limits in Plainville, MA
ADU Setback Requirements in Plainville, MA
ADU Parking Requirements in Plainville, MA
ADU Types Explained in Plainville, MA
ADU Financing in Plainville, MA
ADU Timeline in Plainville, MA
ADU Property Value Impact in Plainville, MA
ADU Rental Income in Plainville, MA
Frequently Asked Questions
Are ADUs allowed by right in Plainville, MA?
Yes. ADUs in Plainville 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 Plainville?
Plainville 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 Plainville?
No. Plainville 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 Plainville, MA?
In Plainville, 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 Plainville have historic district rules for ADUs?
Yes. Plainville has historically significant areas including Historic District Commission, James Humphrey House, Plainville’s History Museum & Archives. Home to the Plainville Historical Commission, North End Historic District, Plainville Historic Center, Plainville Town Hall. 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 Plainville?
Yes, long-term rentals are allowed for ADUs in Plainville. However, short-term rentals (like Airbnb) are not currently allowed for ADUs.
How accurate is the ADU data for Plainville?
The information on this page reflects Massachusetts state baseline rules under the Affordable Homes Act. Plainville may have additional local requirements that differ from the state baseline. We recommend confirming with your local building department before starting your project.