Sudbury
Middlesex County · Pop. 18,934
Sudbury has approved 3 of 3 ADU applications (100% approval rate) and has 4 of 10 bylaw provisions consistent with state law.
Based on 3 approved ADU applications and 18,934 residents
Permits
3 applications since the ADU law took effect in Feb 2025
| Address | Type | Status | Value |
|---|---|---|---|
| Oakwood Ave | Internal | Issued | $50,000 |
| Willow Rd | Detached | Issued | $297,000 |
| Fox Run | Attached | Issued | $300,000 |
Bylaw Consistency
Sudbury’s bylaw was partially gutted by the AG in October 2025 — 3 provisions deleted, 1 partially struck. The surviving ‘architecturally harmonious’ requirement is a gray area. Confirm with the building department which version of the bylaw they’re enforcing.
Provision-by-provision analysis available
We've mapped 10 provisions in Sudbury against Chapter 150. See which specific bylaw sections appear inconsistent with state law.
See full compliance analysisCost Snapshot
Based on 3 permitted ADU projects in Sudbury
Try the full cost estimatorADU Impact on Housing Production
In 2024, Sudbury issued 10 total residential building permits. In the first year of the ADU law, 3 ADU permits were approved — equivalent to 30% of prior-year housing production.
Source: Census Bureau (2024) via UMass Donahue Institute; EOHLC ADU Survey (2025)
How Sudbury Compares
Next Steps
Sources: EOHLC ADU Survey 2025. Individual permit records from municipal building department. Population estimates from 2024 Census ACS.
Disclaimer: ADU Pulse provides data for informational purposes only. It does not constitute legal, financial, or construction advice.Bylaw consistency analysis reflects our interpretation of public records and may not reflect the most current local amendments.
See methodology for details on data collection, scoring, and consistency analysis.