Plymouth
Plymouth County · Pop. 61,217
Plymouth has approved 34 of 42 ADU applications (81% approval rate) and has 5 of 10 bylaw provisions consistent with state law.
Based on 34 approved ADU applications and 61,217 residents
Permits
42 applications since the ADU law took effect in Feb 2025
| Address | Type | Status | Value |
|---|---|---|---|
| Talia Way | Conversion | Issued | — |
| Pine Mountain Dr | Conversion | Issued | — |
| Bearberry Path | Conversion | Issued | — |
| State Rd | Conversion | Issued | — |
| Billington Sea Rd | Conversion | Issued | — |
Bylaw Consistency
Plymouth has 3 inconsistent provisions on the books that haven’t been reviewed by the AG. Owner-occupancy and lot frontage requirements mirror provisions struck down in other towns. These are preempted by state law but may still be applied locally.
Provision-by-provision analysis available
We've mapped 10 provisions in Plymouth against Chapter 150. See which specific bylaw sections appear inconsistent with state law.
See full compliance analysisCost Snapshot
Based on 7 permitted ADU projects in Plymouth
Try the full cost estimatorADU Impact on Housing Production
In 2024, Plymouth issued 293 total residential building permits. In the first year of the ADU law, 34 ADU permits were approved — equivalent to 11.6% of prior-year housing production.
Source: Census Bureau (2024) via UMass Donahue Institute; EOHLC ADU Survey (2025)
How Plymouth 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.