ADU Rules: Holbrook vs Quincy
How do adu rules rules compare between Holbrook, MA and Quincy, MA?
Holbrook and Quincy have similar restriction levels.
Holbrook, MA
Norfolk County
Massachusetts 2024 Affordable Homes Act (MGL c. 40A §3) grants property owners the right to build ADUs on owner-occupied lots by right. Cities and towns cannot ban ADUs but may regulate size (up to 900 sq ft for internal ADUs). Norfolk County has no additional ADU rules.
View full Holbrook rules →Quincy, MA
Norfolk County
Quincy allows ADUs by right under MGL c. 40A §3 and the 2024 Affordable Homes Act. One ADU per single-family lot is allowed as internal, addition, or detached unit. Maximum size is 50% of principal dwelling or 900 sq ft, whichever is less. Minimum size is 320 sq ft for detached units.
View full Quincy rules →Key Facts Comparison
| Fact | Holbrook | Quincy |
|---|---|---|
| State Law | MGL c. 40A §3 — Affordable Homes Act 2024 | - |
| ADUs by Right | Yes — on owner-occupied single-family lots | - |
| Max Size (Internal) | Up to 900 sq ft (municipalities may limit) | - |
| Bans Allowed? | No — cities cannot ban ADUs under new state law | - |
| County ADU Rule? | None — regulated by state law and each town | - |
| Code | - | Quincy ZO + MGL c. 40A §3 |
| Maximum Size | - | 900 sq ft or 50% of principal, whichever is less |
| Minimum Size (detached) | - | 320 sq ft |
| Allowed Types | - | Internal, addition, or detached |
| Additional Parking Required? | - | No |
Highlighted rows indicate differences between cities.
Holbrook FAQ
Can I build an ADU on my property in Norfolk County?
Massachusetts 2024 Affordable Homes Act (MGL c. 40A §3) grants property owners the right to build ADUs on owner-occupied lots by right. Cities and towns cannot ban ADUs but may regulate size (up to 900 sq ft for internal ADUs). Norfolk County has no additional ADU rules.
What are the size limits for an accessory dwelling unit in Norfolk County?
State Law: MGL c. 40A §3 — Affordable Homes Act 2024. ADUs by Right: Yes — on owner-occupied single-family lots. Max Size (Internal): Up to 900 sq ft (municipalities may limit). Bans Allowed?: No — cities cannot ban ADUs under new state law.
Quincy FAQ
Can I build an ADU on my property in Quincy?
Quincy allows ADUs by right under MGL c. 40A §3 and the 2024 Affordable Homes Act. One ADU per single-family lot is allowed as internal, addition, or detached unit. Maximum size is 50% of principal dwelling or 900 sq ft, whichever is less. Minimum size is 320 sq ft for detached units.
What are the size limits for an accessory dwelling unit in Quincy?
Code: Quincy ZO + MGL c. 40A §3. Maximum Size: 900 sq ft or 50% of principal, whichever is less. Minimum Size (detached): 320 sq ft. Allowed Types: Internal, addition, or detached.
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