ADU Rules: Brookline vs Weymouth
How do adu rules rules compare between Brookline, MA and Weymouth, MA?
Brookline and Weymouth have similar restriction levels.
Brookline, MA
Norfolk County
Brookline updated its ADU bylaw (§ 4.05) in 2024 to comply with MGL c. 40A §3. One ADU by right on single-family lots is allowed up to 900 sq ft or 50% of principal floor area. Owner-occupancy requirements removed. FAR cap for ADUs eliminated.
View full Brookline 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 | Brookline | Weymouth |
|---|---|---|
| Code Section | Brookline ZO § 4.05 (2024 amendment) | Weymouth Code Ch. 120, Art. 29 (Measure 24-119) |
| Maximum Size | 900 sq ft or 50% of principal GFA | - |
| Owner-Occupancy | No longer required | - |
| Parking | Max 1 space; exempt within 0.5 mi of transit | 1 space (waived within 0.5 mi of transit) |
| Architecture | Must match principal dwelling style | - |
| 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 |
Highlighted rows indicate differences between cities.
Brookline FAQ
Can I build an ADU on my property in Brookline?
Brookline updated its ADU bylaw (§ 4.05) in 2024 to comply with MGL c. 40A §3. One ADU by right on single-family lots is allowed up to 900 sq ft or 50% of principal floor area. Owner-occupancy requirements removed. FAR cap for ADUs eliminated.
What are the size limits for an accessory dwelling unit in Brookline?
Code Section: Brookline ZO § 4.05 (2024 amendment). Maximum Size: 900 sq ft or 50% of principal GFA. Owner-Occupancy: No longer required. Parking: Max 1 space; exempt within 0.5 mi of transit.
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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