Worcester allows ADUs in residential zones with reasonable regulations. The city is moderately ADU-friendly, with straightforward permitting and moderate size limits suitable for most development goals.
Zoning & Size Requirements
| Allowed Zones | Residential zones A and B |
| Max Size (Detached) | 850 sq ft |
| Max Size (Attached) | 750 sq ft |
| Max Size (JADU) | Not allowed |
| Max Height | 30 feet |
| Max Units | 1 ADU per lot |
Setback Requirements
| Rear Setback | 20 feet |
| Side Setback | 5 feet |
| Front Setback | 20 feet |
| Parking Required | 1 space per unit |
| Owner Occupancy | Not required |
| Min Lot Size | 5,000 sq ft |
Permit Process & Fees
| Approval Process | Building permit |
| Review Timeline | 60-80 days |
| Permit Fees | $2,800-$4,500 |
| Impact Fees | $1,000-$1,800 |
| Plan Check | 2-3 weeks |
| Pre-Approved Plans | Not available |
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Construction Costs
| Average Build Cost | $140,000-$280,000 |
| Cost per Sq Ft | $165-$330 |
| Garage Conversion | $70,000-$160,000 |
| Prefab ADU (Installed) | $110,000-$250,000 (installed) |
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| Avg Rent (1 Bedroom) | $1,250-$1,650/mo |
| Avg Rent (2 Bedroom) | $1,550-$2,150/mo |
| Short-Term Rental | Not permitted |
| Est. Annual ROI | 7-10% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half. Compare top prefab manufacturers.
Compare Prefab ADUs →Recent Law Changes
What's Changed Recently
- 2024: Expanded ADU allowance in residential zones
- 2023: Streamlined permitting timeline
- 2024: Increased max detached ADU size from 750 to 850 sq ft
- 2023: Reduced impact fees for ADU development
Tips for Building an ADU in Worcester
- Worcester's lower property costs vs. Boston/Cambridge create excellent ROI
- Revitalization efforts increasing neighborhood stability and demand
- Good cash flow potential due to cost basis advantages
- Community college and hospital create stable tenant base
Frequently Asked Questions
Can I build an ADU in Worcester?
Yes. ADUs are allowed in Residential zones A and B in Worcester. The maximum size for a detached ADU is 850 sq ft. No owner-occupancy is required.
How much does an ADU cost in Worcester?
ADU construction in Worcester typically costs $140,000-$280,000. Garage conversions run $70,000-$160,000, and prefab ADUs cost $110,000-$250,000 (installed).
How much can I rent an ADU for in Worcester?
Average ADU rents in Worcester are $1,250-$1,650/mo for a 1-bedroom and $1,550-$2,150/mo for a 2-bedroom unit.
Do I need parking for an ADU in Worcester?
1 space per unit. Check with Worcester planning department for the latest Massachusetts ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Worcester?
The permit review timeline in Worcester is 60-80 days. Fees range from $2,800-$4,500.
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