ADU Pass
Jamestown
ADU Pass helps homeowners in Jamestown, Newport County, Rhode Island navigate the permit paperwork for building an accessory dwelling unit. This area covers 1 ZIP code.
Map
ADU details
ADU legality: allowed
By-right ADU under state law and town zoning. CRMC permits are the dominant added complexity rather than zoning - most Jamestown parcels lie within the 200-ft CRMC jurisdictional setback from tidal water.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 150 | $2,800 | $48,900 | $51,700 |
| 600 | 600 | $3,500 | $195,600 | $199,100 |
| midpoint | 675 | $3,700 | $220,050 | $223,750 |
| 1000 | 1,000 | $4,500 | $335,000 | $339,500 |
| maximum | 1,200 | $5,200 | $414,000 | $419,200 |
Fee breakdown (as of 2026-04)
Permitting process
Viability (permitted uses)
- Long-term rental: yes Long-term tenancy permitted under by-right ADU framework. Year-round housing supply is constrained on the island - long-term ADUs serve a real need.
- Short-term rental: with-restrictions Jamestown registers and regulates STRs separately. Conanicut Island is a popular summer destination; STR demand is strong. Verify town STR registration requirements before listing.
- Office rental: with-restrictions Office rental of an ADU to non-resident requires home-occupation permit; not generally permitted as accessory use.
- Home office: yes Owner home-occupation permitted with restrictions on signage, customer traffic.
- Studio / workshop: yes Personal artist or workshop use is by-right; Jamestown has a small artist community.
- Agriculture: with-restrictions Limited urban agriculture and small-livestock allowed in some lower-density zones; CRMC restricts wetland/coastal-edge agriculture.
- Relative support: yes Family-member ADU is a common pathway; Jamestown families use ADUs to keep adult children on the island given high property values.
Incentives
Contacts
Utilities
- Water: Jamestown Water & Sewer Department (urban district served); private wells (rural parcels) · 30d connect · $5,500
Town water serves the Conanicut village urban district (downtown, near the Newport bridge approach). Outlying parcels (north Conanicut, Beavertail State Park area, Dutch Island side) rely on private wells. Reach Water & Sewer at 401-423-9808. - Sewer: Jamestown Sewer Division (urban district); OWTS / septic (rural and Beavertail-area parcels) under RI DEM and CRMC jurisdiction · 30d connect · $7,500
Town sewer covers ~50% of parcels (urban district). The remaining lots use OWTS systems regulated by RI DEM and, in coastal zones, by CRMC. New OWTS design+install for ADU often runs $20K-$35K on island parcels. - Electric: Rhode Island Energy · 30d connect · $1,800
RI Energy serves all of Conanicut Island via a single submarine cable from the mainland. Service-upgrade common for ADU additions. - Gas: No piped natural gas on Conanicut Island; propane delivery typical · 14d connect · $2,500
Conanicut Island is not served by piped natural gas. Most homes use propane (delivered by trucks from mainland) or all-electric (heat pumps). ADU design typically follows existing primary-dwelling fuel choice.
Property values & taxes
Construction timeline
Realistic total: best 8mo · typical 13mo · worst 20mo
Island construction adds 2-4 weeks vs mainland Newport County: bridge logistics for materials, fewer GCs willing to commute daily, CRMC review timelines. Beavertail State Park area parcels often have wells and OWTS that need ADU coordination.
Modular pathway inspectors are occasional with modular
Financing
State ADU loans:
Insurance impact
Island-wide coastal exposure plus FEMA SFHA prevalence drives substantial NFIP/RCBAP flood insurance burden on top of standard ADU premium delta. Wind insurance is a separate consideration on Aquidneck Island peers and applies here too. Jamestown insurance premiums frequently double or triple the typical RI ADU delta.
HOA prevalence & preemption
HOA prevalence very low; mostly limited to a few small condominium developments near Jamestown Village. Most Jamestown parcels are single-family non-HOA. R.I.G.L. § 45-24-73 voids HOA covenants conflicting with state ADU minimums.
Regulatory overlays (4)
- coastal-commission
CRMC jurisdiction is the dominant regulatory layer - the entire town sits on Conanicut Island and nearly all parcels are within 200 ft of tidal water requiring CRMC Assent. Beavertail State Park, Mackerel Cove, Sheffield Cove, Dutch Harbor, and Narragansett Bay shoreline parcels face stricter coastal-buffer rules. - flood-zone
Substantial FEMA AE/VE Special Flood Hazard Areas around Mackerel Cove, Sheffield Cove, Dutch Harbor, Round Marsh, and Narragansett Bay shoreline. Elevation Certificates required for SFHA parcels; VE-zone parcels require pile or column foundations. - historic-district
Jamestown Historic District (Jamestown Village) registered with the National Register of Historic Places. Historic District Commission reviews exterior alterations on contributing structures within the district. - wetland-overlay
Round Marsh, Marsh Meadows Wildlife Preserve, and Hodgkiss Brook wetlands trigger RI DEM freshwater wetlands review for ADU work nearby. Buffer typically 100 ft from wetland edge.
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Amendment
- Amendment
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: Town of Jamestown Zoning Ordinance (as amended 2024 for ADU compliance), adopted 1965-01-01, last amended 2024-09-16
- 2024-06-25 — RI H 7062 / S 2998 signed - statewide by-right ADU mandate (state-law)
RI 2024 ADU enabling package preempts municipalities, sets minimum standards.
Effect: Required Jamestown to update zoning ordinance ADU language. - 2024-09-16 — Jamestown Zoning Ordinance ADU Amendments (RIHousing MTAP-tracked) (town-ordinance)
Town Council adopted amendments to align Jamestown zoning with R.I.G.L. § 45-24-73 ADU minimums; documented in RIHousing Municipal Technical Assistance Program tracking.
Effect: Ministerial administrative-permit pathway for ADUs replaces prior zoning-board route on owner-occupied lots.
Known issues (2)
- policy-review — CRMC Assent timelines (60-90 days standard, longer for Category B applications) frequently dominate the critical path. Plan ADU schedule around CRMC review window, not town building permit window.
- other — Most Jamestown parcels rely on private wells and OWTS (septic) under RI DEM jurisdiction. ADU water-supply capacity test and OWTS sizing review can add $5K-$15K of soft cost.
Rhode Island state — ADU law and programs
State ADU law
Rhode Island enacted statewide ADU preemption in 2024 through H 7062 (chief sponsor Rep. June Speakman and colleagues; co-sponsored in the Senate as S 2710), which amended the Zoning Enabling Act (Title 45, Chapter 24). Municipalities must permit ADUs by-right on any lot containing a single-family dwelling, subject only to uniform minimum standards set by the statute. One of the most ADU-friendly state statutes in the country as of 2025.
- R.I.G.L. § 45-24-73 — Design standards required for accessory dwelling units; Consistent statewide treatment of accessory dwelling units required — Core ADU standards added by H 7062 (2024). Requires municipalities to permit ADUs by-right. Caps 1-bedroom and studio ADUs at 900 sqft or 60% of the principal dwelling's floor area, whichever is less. Caps 2-bedroom ADUs at 1,200 sqft or 60%, whichever is less. Prohibits owner-occupancy requirements. Caps additional parking at 1 off-street space per bedroom. Prohibits ADU-specific impact fees. Voids HOA, condominium, and similar private-covenant restrictions that conflict with the statute as against public policy.
- H 7062 (2024 RI General Assembly) — An Act Relating to Housing — Accessory Dwelling Units — The enacting bill. Also cited by municipalities adopting conforming ordinances (Providence 2024 Chapter 3584, East Providence 2024 ADU Ordinance, South Kingstown 2024-07-12 regulations).
State HOA preemption
R.I.G.L. § 45-24-73 explicitly voids homeowners' association, condominium association, or similar private-covenant restrictions on ADUs when those restrictions conflict with the statute's ADU minimums. The preemption is framed as a public-policy void, meaning the offending covenant is unenforceable rather than simply regulated. Pre-existing ADU-friendly covenants remain valid (the statute only void conflicting restrictions). Applies to all common-interest communities governed by the Rhode Island Condominium Act (R.I.G.L. Title 34, Chapter 36) and Rhode Island Condominium Ownership Act (Title 34, Chapter 36.1), as well as HOAs in planned-community subdivisions.
- R.I.G.L. § 45-24-73 (HOA preemption clause added by H 7062 (2024)) — Provides that private covenant restrictions imposed by condominium associations, homeowners' associations, or similar residential property governing bodies that conflict with the ADU provisions are void as against public policy. Drafted broadly — covers declarations, bylaws, rules and regulations, and recorded covenants.
State financing programs
RIHousing, the state's housing finance agency, operates an ADU financing program built around the FHA 203(k) loan product. Covers attached and interior ADUs for both purchase and refinance. Detached ADUs are NOT eligible. Requires mandatory homebuyer education, use of an FHA-approved 203(k) consultant, and a RI licensed and insured contractor. No state-specific grant program for ADUs is in effect as of 2026-04-21; the federal 203(k) rails are the production vehicle.
State housing programs
Rhode Island does not currently operate a single statewide pre-approved-ADU-plan catalog (as California's CalHFA and Washington's Commerce plan libraries). Implementation of the 2024 ADU law is happening municipality-by-municipality, with the Executive Office of Housing (EOH) coordinating technical assistance. Providence published a citywide ADU Guide (February 2025) as the leading model; East Providence adopted a conforming ordinance in 2024; South Kingstown published regulations in 2024. RIHousing runs the ADU financing side (see stateFinancing).
Federal (United States) — ADU-relevant rules and programs
Federal ADU law
The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.
Federal financing programs
Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.
Federal tax credits
There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.
Federal housing programs
HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.
ZIP Code
- 02835
Post Office
- 109 Narragansett Ave, 02835