ADU Rules: Fitchburg vs Worcester
How do adu rules rules compare between Fitchburg, MA and Worcester, MA?
Fitchburg and Worcester have similar restriction levels.
Fitchburg, MA
Worcester County
MA Affordable Homes Act (Ch. 150, Acts of 2024, §8), effective Feb 2, 2025 — ADUs allowed by right in single-family zones statewide, max 900 sq ft or 50% of principal dwelling GFA. Fitchburg Zoning Chapter 181 governs setbacks, height, and bulk. No owner-occupancy requirement.
View full Fitchburg rules →Worcester, MA
Worcester County
Worcester allows ADUs on properties with existing single-, two-, or three-family dwellings as of January 2024. ADUs are limited to 900 square feet. Massachusetts law now allows ADUs by right statewide.
View full Worcester rules →Key Facts Comparison
| Fact | Fitchburg | Worcester |
|---|---|---|
| State Law | Ch. 150, Acts of 2024, §8 | By right statewide |
| By-Right | Yes, in single-family zones | - |
| Max Size | 900 sq ft or 50% of dwelling | 900 sq ft |
| Local Regs | Chapter 181 setbacks/height | - |
| Effective | - | January 9, 2024 |
| Eligible | - | 1-3 family properties |
| Number | - | One per property |
Highlighted rows indicate differences between cities.
Fitchburg FAQ
Can I build an ADU on my property in Fitchburg?
MA Affordable Homes Act (Ch. 150, Acts of 2024, §8), effective Feb 2, 2025 — ADUs allowed by right in single-family zones statewide, max 900 sq ft or 50% of principal dwelling GFA. Fitchburg Zoning Chapter 181 governs setbacks, height, and bulk. No owner-occupancy requirement.
What are the size limits for an accessory dwelling unit in Fitchburg?
State Law: Ch. 150, Acts of 2024, §8. By-Right: Yes, in single-family zones. Max Size: 900 sq ft or 50% of dwelling. Local Regs: Chapter 181 setbacks/height.
Worcester FAQ
Can I build an ADU in Worcester?
Yes. ADUs up to 900 square feet are allowed on properties with existing 1-3 family dwellings. Massachusetts law now allows ADUs by right statewide.
Where can an ADU be placed on my property in Worcester?
ADUs cannot be in the front yard. If attached to the side of the main building, the ADU must be setback 5 feet from the front elevation. Detached ADUs go in the rear yard.
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