Cumberland

1. Confirm Cumberland Chapter 33 zoning of the lot (~3d)
   Verify lot zoning under Cumberland Code Chapter 33. A-1, A-2, A-3 single-family districts dominate; mill villages along the Blackstone (Valley Falls, Berkeley, Lonsdale, Ashton, Manville) have B district overlays; Diamond Hill area is typically A-3 large-lot. The 20,000 sf minimum lot size is one of the three by-right qualifying paths under the post-September 2024 ADU revisions.
2. Sewer-versus-septic determination (~21d)
   The Cumberland Sewer Department serves the historic mill-village strip along the Blackstone River (Valley Falls, Lonsdale, Ashton, parts of Berkeley and Manville). Outside that envelope, lots are on private septic regulated by RIDEM ISDS. An additional bedroom requires OWTS review for septic parcels - longest-pole permitting step at 60-90 days.
3. Pre-application meeting with Cumberland Planning Department (~7d)
   Recommended pre-application meeting at Cumberland Town Hall, 45 Broad Street. Strongly recommended for any work in the Lonsdale or Ashton mill-village historic districts.
4. Submit building permit via Cumberland OpenGov portal (~1d)
   Cumberland's Building & Zoning Department uses the OpenGov portal at cumberlandri.portal.opengov.com for online permit intake. The Building Department maintains a workstation for public use during regular business hours within the Building Department office at Town Hall. Phone 401-728-2400 with appropriate department extension.
5. Cumberland Water Department coordination for water tap (~14d)
   The Cumberland Water Department is a municipal department serving most of the town. Small portions of Cumberland near the Lincoln line are served by Pawtucket Water Supply Board (PWSB) instead. New water tap or service upsize processed through Cumberland Water Department.
6. Plan review by Cumberland Building Official (~20d)
   Plan review against IRC 2018 with RI amendments through the Cumberland Building & Zoning Department. RI removed the IRC R313 sprinkler mandate so detached ADUs do not need NFPA 13D. Typically 2 review cycles for ADUs.
7. Historic district review (if applicable) (~30d)
   Parcels in the Lonsdale or Ashton mill-village historic districts require Cumberland Historic District Commission review for exterior changes. The HDC cannot categorically prohibit ADUs but may condition exterior treatment.
8. Required inspections
   Footing, framing, MEP rough, insulation, and final inspections coordinated through the Cumberland OpenGov portal and the Building Official's office.
9. Certificate of Occupancy (~5d)
   Issued by Cumberland Building Official upon final inspection pass.

• Long-term rental: yes Long-term rental of ADU explicitly permitted under Cumberland Chapter 33 Article 6 (post-September 2024 revisions) conforming to RIGL 45-24-37(j). Owner-occupancy is no longer required for non-disability ADUs.
• Short-term rental: with-restrictions Cumberland regulates STRs separately from ADU permitting. Diamond Hill State Park and the CCRI Knight Campus generate seasonal STR demand.
• Office rental: with-restrictions Detached commercial office rental requires home occupation permit or rezoning under Cumberland Chapter 33.
• Home office: yes Home occupation permitted under Cumberland Chapter 33 with restrictions on signage and customer traffic.
• Studio / workshop: yes Personal artist or workshop studio is a permitted accessory residential use.
• Agriculture: with-restrictions Limited agriculture permitted in Cumberland's A-3 large-lot districts (notably Diamond Hill area); livestock varies by district under Chapter 33.
• Relative support: yes Family-disability or 62+ family-occupancy ADU explicitly permitted by-right on owner-occupied parcels per Chapter 33 Article 6; a recorded land-evidence declaration is required and lapses on title transfer or when the qualifying family member no longer resides.

• Water: Cumberland Water Department (municipal, most of town); small areas near Lincoln line served by Pawtucket Water Supply Board (PWSB) · 21d connect · $4,500
• Sewer: Cumberland Sewer Department (Blackstone-corridor mill villages: Valley Falls, Lonsdale, Ashton, parts of Berkeley/Manville); RIDEM ISDS septic elsewhere · 28d connect · $6,500
• Electric: Rhode Island Energy · 14d connect · $1,800
• Gas: Rhode Island Energy (gas - main areas only; Diamond Hill rural areas often propane or oil) · 21d connect · $1,500

Realistic total: best 7mo · typical 11mo · worst 17mo

State ADU loans:

• RIHousing ADU 203(k) financing
• Rhode Island Executive Office of Housing

RIGL 45-24-73 voids HOA / condo / similar private-covenant restrictions on ADUs that conflict with the statute's ADU minimums. Cumberland's late-20th-century Diamond Hill and Cumberland Hill subdivisions include HOA-controlled parcels; legacy Blackstone-corridor mill villages have minimal HOA structure.

• flood-zone
  Portions of Cumberland along the Blackstone River corridor (Valley Falls, Lonsdale, Ashton, Manville) are in FEMA Special Flood Hazard Areas; elevation certificates and flood-resistant construction required for SFHA parcels per FIRM panels for Cumberland, RI.
• historic-district
  Lonsdale and Ashton mill-village historic districts trigger Cumberland Historic District Commission review for ADUs in the historic boundaries. Diamond Hill area has separate rural-historic preservation considerations.
• septic-required
  Outside the Blackstone-corridor sewered envelope (Valley Falls, Lonsdale, Ashton), lots are on private septic; RIDEM ISDS approval for additional bedrooms is required and adds 60-90 days to timeline.