ADU Pass
Smithfield
ADU Pass helps homeowners in Smithfield, Providence 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
ADUs by right under Town of Smithfield Chapter 320 (as amended 2024-02-06) and RIGL Sec 45-24-73. Online intake mandatory since 2025-03-05.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 200 | $2,200 | $58,000 | $60,200 |
| 600 | 600 | $3,400 | $207,000 | $210,400 |
| midpoint | 900 | $4,500 | $310,500 | $315,000 |
| maximum | 1,200 | $5,800 | $414,000 | $419,800 |
Fee breakdown (as of 2026-04)
Permitting process
- Pre-application research at Smithfield Building & Zoning Office (~3d)
Confirm zoning district (RA, RM, R-15, R-20, R-40 etc.) and lot eligibility under Chapter 320. Office at 64 Farnum Pike accepts walk-ins; Smithfield Permit Fee Estimator available on the town website to forecast costs. - Submit zoning application via permits.ri.gov (mandatory online since 2025-03-05) (~1d)
All Smithfield zoning applications must be filed through the statewide RI e-permitting portal. Required: site plan, floor plan, elevations, structural plans, IECC 2018 compliance documentation, RIDEM septic / well capacity letters where applicable. - Zoning compliance review (~14d)
Smithfield Zoning Officer reviews setbacks, lot coverage, parking, and ADU-specific dimensional standards under Chapter 320. - Building plan review (combined building / electrical / plumbing / mechanical) (~21d)
Smithfield Building Official routes plans to plumbing and electrical inspectors concurrently. Plan review aims for completion within 21 days. - Smithfield Water Supply Board capacity confirmation (where on municipal water) (~7d)
For parcels in the Smithfield Water Supply Board service territory (Greenville, Esmond, parts of Stillwater), SWSB confirms capacity for the additional dwelling. Phone 401-233-1066. - Permit issuance and fee payment (~2d)
After approvals, permit issues through the state portal. Fees paid online per RI state schedule. - Construction inspections
Foundation, frame, MEP rough, insulation, drywall, final. Smithfield uses combined inspections where possible. - Certificate of occupancy (~5d)
Final inspection by Building Official triggers CO.
Viability (permitted uses)
- Long-term rental: yes Long-term rental of ADU explicitly permitted under Chapter 320 / RIGL Sec 45-24-73.
- Short-term rental: with-restrictions Smithfield does not have a dedicated STR ordinance; STR of an ADU permitted but parcel still subject to nuisance/noise ordinances. Bryant University corridor has informal owner expectations re: student rentals.
- Office rental: no Chapter 320 limits ADU to dwelling-unit use.
- Home office: yes Home occupation permitted in residential districts subject to use-table conditions.
- Studio / workshop: yes Personal artist / workshop studio permitted as accessory residential use.
- Agriculture: with-restrictions RA Rural Agricultural district allows broader agriculture uses; ADU use itself remains residential.
- Relative support: yes Family-occupancy ADU permitted; in-law suite was the dominant pre-2024 use case.
Contacts
Staff: Smithfield Water Supply Board (Water utility (Greenville / Esmond / partial Stillwater)), Smithfield Department of Public Works (Sewer / streets)
Utilities
- Water: Smithfield Water Supply Board (Greenville, Esmond, partial Stillwater); private wells elsewhere including most of Georgiaville · 21d connect · $5,500
- Sewer: Town of Smithfield WPCF (Pleasant View Ave plant); broad service area but rural southwestern parcels remain on septic · 21d connect · $7,500
- Electric: Rhode Island Energy · 21d connect · $1,800
- Gas: Rhode Island Energy (gas) - mains throughout most of Smithfield · 21d connect · $1,900
Property values & taxes
Market rent by ADU size
| Sq ft | Rent |
|---|---|
| 400 | $1,300/mo |
| 700 | $1,850/mo |
| 1,200 | $2,400/mo |
Construction timeline
Realistic total: best 7mo · typical 11mo · worst 16mo
Smithfield contractor depth slightly better than NS due to larger affluent suburban demand. Bryant University corridor specialty trades (cabinetry, custom millwork) more available.
Modular pathway RI State Building Code Commission - Modular Home Program · inspectors are occasional with modular
Smithfield's Putnam Pike (US 44) and Pleasant View Ave routes accommodate standard module widths; Stillwater Reservoir bridges can constrain larger transports.
Financing
State ADU loans:
- RIHousing - state mortgage / refi products eligible for ADU (Rhode Island Housing and Mortgage Finance Corporation)
Insurance impact
Stillwater Reservoir watershed policies sometimes require additional disclosure; carriers active in market.
HOA prevalence & preemption
Smithfield has higher HOA share than rural NS due to several condo and townhouse developments in Greenville and Esmond. RI statute voids any HOA covenant conflicting with the ADU statute.
Regulatory overlays (2)
- flood-zone — FEMA SFHA Zone AE along Stillwater River and Woonasquatucket River; Zone X-shaded along Stillwater Reservoir · +14d · +8% cost
Stillwater Reservoir and the Woonasquatucket / Stillwater Rivers create significant flood-zone footprint in southern Smithfield. (map) - wetlands — RIDEM-mapped freshwater wetlands throughout Smithfield (significant Stillwater Reservoir and Georgiaville Pond shorelines) · +30d · +5% cost
RIDEM Freshwater Wetlands permit may be required if construction within 50 ft of wetland boundary or 200 ft of perennial stream. (map)
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Rhode Island State Building Code (SBC-1) - amendments to IRC 2018 — RI removes IRC R313 sprinkler mandate; modifies frost depth and energy provisions.
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: Town of Smithfield Code of Ordinances Chapter 320 - Zoning, adopted 2013, last amended 2024-02-06
- 2024-02-06 — Town of Smithfield Zoning Ordinance comprehensive amendment (city-ordinance)
Town Council adopted comprehensive Zoning Ordinance amendments updating Chapter 320 to align with 2024 RI statutory framework, including ADU provisions.
Effect: Brought Smithfield's ADU rules into conformance with the new statewide minimums; ADUs now permitted by right where previously they required special-use permit in some districts. - 2024-06-25 — RI H 7062 / S 2998 signed - statewide ADU mandate codified at RIGL Sec 45-24-73 (state-law)
Required every Rhode Island municipality to allow one ADU by right on owner-occupied 1-3 family residential lots, subject to statutory size and design minimums.
Effect: Smithfield's February 2024 amendment was already substantially compliant; minor follow-up amendment may issue. - 2025-03-05 — Smithfield online-only zoning application requirement (city-ordinance)
Per RIGL Sec 45-24-58.1, all Smithfield zoning applications now must be submitted online through the statewide e-permitting portal.
Effect: Eliminated paper intake; routes all ADU and zoning paperwork through the state portal at permits.ri.gov.
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
- 02917
Post Office
- 290 Old County Rd, 02917