ADU Rules: Quincy vs Weymouth
How do adu rules rules compare between Quincy, MA and Weymouth, MA?
Quincy and Weymouth have similar restriction levels.
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 →Weymouth, MA
Norfolk County
Weymouth Town Council passed ADU Ordinance Amendment (Measure 24-119) adding Article 29 to Chapter 120. ADUs are allowed by right on single-family lots up to 900 sq ft or 50% GFA. Lots under 5,000 sq ft are ineligible.
View full Weymouth rules →Key Facts Comparison
| Fact | Quincy | Weymouth |
|---|---|---|
| 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 | - |
| Code Section | - | Weymouth Code Ch. 120, Art. 29 (Measure 24-119) |
| Max Size (small lots) | - | 750 sq ft (lots under 25,000 sq ft) |
| Max Size (large lots) | - | 900 sq ft (lots over 25,000 sq ft) |
| Ineligible Lots | - | Under 5,000 sq ft |
| Parking | - | 1 space (waived within 0.5 mi of transit) |
Highlighted rows indicate differences between cities.
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.
Weymouth FAQ
Can I build an ADU on my property in Weymouth?
Weymouth Town Council passed ADU Ordinance Amendment (Measure 24-119) adding Article 29 to Chapter 120. ADUs are allowed by right on single-family lots up to 900 sq ft or 50% GFA. Lots under 5,000 sq ft are ineligible.
What are the size limits for an accessory dwelling unit in Weymouth?
Code Section: Weymouth Code Ch. 120, Art. 29 (Measure 24-119). Max Size (small lots): 750 sq ft (lots under 25,000 sq ft). Max Size (large lots): 900 sq ft (lots over 25,000 sq ft). Ineligible Lots: Under 5,000 sq ft.
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