ADU Rules: Brockton vs North Plymouth
How do adu rules rules compare between Brockton, MA and North Plymouth, MA?
North Plymouth has fewer restrictions than Brockton.
Brockton, MA
Plymouth County
Massachusetts enacted statewide ADU legislation effective 2025, allowing ADUs by right in single-family zones. Brockton must comply with the new state requirements.
View full Brockton rules →North Plymouth, MA
Plymouth County
The 2024 Affordable Homes Act amended MGL Chapter 40A to require all Massachusetts municipalities to allow accessory dwelling units by-right in single-family zoning districts, preempting restrictive local rules.
View full North Plymouth rules →Key Facts Comparison
| Fact | Brockton | North Plymouth |
|---|---|---|
| State Law | MA Affordable Homes Act (2024) | - |
| By Right | Allowed in single-family zones | - |
| Permit | Building permit required | - |
| Size | Limited relative to primary dwelling | - |
| Statute | - | MGL Chapter 40A Section 3 |
| Maximum Size | - | 900 square feet |
| Approval Type | - | By-right, no special permit |
| Owner Occupancy | - | Cannot be required |
Highlighted rows indicate differences between cities.
Brockton FAQ
Can I build an ADU in Brockton?
Yes. Massachusetts now requires municipalities to allow ADUs by right in single-family zones under the Affordable Homes Act.
What are the requirements?
ADUs must comply with building code standards, size limits, setbacks, and obtain a building permit.
North Plymouth FAQ
Can a Massachusetts town still require a special permit for ADUs?
No. Under the amended Chapter 40A Section 3, ADUs up to 900 square feet must be allowed by-right in single-family zones. Special permit requirements are preempted statewide.
Does the Massachusetts ADU law allow short-term rentals?
The state law allows municipalities to prohibit short-term rental use of protected ADUs. Many local bylaws restrict ADU use to long-term tenancies of 30 days or more.
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