Skip to main content
PermitBase

Accessory Dwelling Unit (ADU) in Riverton, Utah

Required for construction of a secondary dwelling unit on a residential property in Riverton, including basement apartments, detached cottages, and garage conversions. Riverton charges a $175 ADU fee (planning) plus a valuation-based building permit.

Verified 2026-07-01 · Source

When you need this permit

  • Property must qualify under Riverton zoning for ADU use — contact Planning & Zoning at 801-208-3149
  • Maximum size limits and setback requirements vary by zone
  • Separate entrance from primary dwelling required
  • A rental business license from Riverton may be required before renting

Required documents

Check off what you have — your progress is saved on this device.

Not ready yet — 0 of 4 required documents checked.

This checker covers one permit. A full project usually triggers several — our paid checklist will assemble all of them, from $29 →

Fee schedule

ADU Application / Planning FeeVerified flat fee, confirmed via full-text extraction of Riverton City FY2025-26 Adopted Fee Schedule, line 69: "Accessory Dwelling Unit Fee — $175.00 — July 1, 2020" (Planning & Zoning section).
$175.00
Building Permit — valuation-basedGrounded, published valuation-based fee — Riverton City FY2025-26 Adopted Fee Schedule, line 165 ("Permits - Building, valuation data based on February 2020 ICC (BVD) Table"). Plan check fee is 45% of building permit fee for SFD residential (line 172).
Assessed on project valuation per the 1994 Modified UBC 1-A Fee Table; valuation per February 2020 ICC BVD Table
Re-Inspection FeeRiverton City FY2025-26 Adopted Fee Schedule, line 180
$50.00 per occurrence

Review timeline

Plan reviewTypical estimate — confirm current times with the Riverton building department
~14–30 business days

How long did your Accessory Dwelling Unit (ADU) permit actually take in Riverton?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Foundation

    Footings, forms, rebar — before concrete pour.

  2. 2

    Framing

    Structure, fire separation, egress windows.

  3. 3

    MEP Rough-In

    Mechanical, electrical, plumbing rough-ins before walls closed.

  4. 4

    Insulation

    Insulation and vapor barrier before drywall.

  5. 5

    Final

    All work complete, smoke/CO detectors, address posted, ready for occupancy.

See the full Riverton inspection guide — scheduling & re-inspection fees →

Tips

  • Riverton charges a $175 ADU application fee through Planning & Zoning in addition to the valuation-based building permit — confirm current ADU eligibility with Planning at 801-208-3149.
  • Utah HB 82 (2021) requires most cities to allow at least internal ADUs; Riverton may allow additional ADU types depending on zone.
  • Basement ADU bedrooms must have IRC-compliant egress windows (5.7 sq ft minimum opening).
  • A Land Disturbance Permit from Riverton Stormwater (stormwater@rivertonutah.gov) is typically required alongside the building permit.

Frequently asked questions

Riverton requires an accessory dwelling unit (adu) permit for: Property must qualify under Riverton zoning for ADU use — contact Planning & Zoning at 801-208-3149; Maximum size limits and setback requirements vary by zone; Separate entrance from primary dwelling required; A rental business license from Riverton may be required before renting. If your project isn't listed, confirm with Riverton City Building Division at (801) 208-3138 before starting work.

Riverton charges a $175 ADU planning application fee (FY2025-26 fee schedule) plus a valuation-based building permit using the 1994 Modified UBC 1-A table. Plan check is 45% of the building permit fee for residential. Contact building@rivertonutah.gov for a fee estimate based on your project scope.

Plan review for an accessory dwelling unit (adu) permit in Riverton typically runs 14–30 business days. This is an estimate, not a published figure — confirm current review times with Riverton City Building Division at (801) 208-3138.

You'll need: Building Permit Application; Site Plan; Construction Plans; Zoning Compliance Verification. See the required-documents checklist on this page for details on each.

Riverton requires 5 inspection(s) for an accessory dwelling unit (adu) permit, in order: Foundation, Framing, MEP Rough-In, Insulation, Final. Schedule each through Riverton City Building Division ((801) 208-3138).

Apply through Riverton City Building Division at 12830 S Redwood Road, Room 105, Riverton, UT 84065. Phone: (801) 208-3138, email: building@rivertonutah.gov. Office hours: Mon–Fri 8:00 AM – 5:00 PM. Official information: https://www.rivertonutah.gov/building/.

Riverton, Utah has adopted: 2024 International Building Code (IBC), including Appendices C and J — Riverton City Code § 15.10.010 (dynamic adoption clause: 'the most recent version... adopted by the state of Utah... [with] adoption of updated versions by the state of Utah after the date of this chapter [having] the effect of updating Riverton City's building code(s)'); Utah Code § 15A-2-103(1)(a); effective 2026-07-01, superseded the 2021 edition that had been in effect since July 1, 2023; 2021 International Residential Code (IRC), including Appendices AE and AQ — Riverton City Code § 15.10.010; Utah Code § 15A-2-103(1)(b)/(c)/(k); unchanged by the 7/1/2026 code cycle; 2024 International Plumbing Code (IPC) — Riverton City Code § 15.10.010; Utah Code § 15A-2-103(1)(d); effective 2026-07-01, superseded the 2021 edition that had been in effect since July 1, 2023; 2024 International Mechanical Code (IMC) — Riverton City Code § 15.10.010; Utah Code § 15A-2-103(1)(e); effective 2026-07-01, superseded the 2021 edition that had been in effect since July 1, 2023; 2024 International Fuel Gas Code (IFGC) — Riverton City Code § 15.10.010; Utah Code § 15A-2-103(1)(f); effective 2026-07-01, superseded the 2021 edition that had been in effect since July 1, 2023; 2023 National Electrical Code (NEC) — Utah Code § 15A-2-103(1)(g); statewide adoption; unchanged by the 7/1/2026 code cycle; also listed on rivertonutah.gov/building/code.php; Residential provisions of Chapter 11, Energy Efficiency, of the 2015 International Residential Code — rivertonutah.gov/building/code.php item 7 (verified live 2026-07-16, wording unchanged from before this fix); Riverton's own residential-energy baseline citation, distinct from the statewide IECC line below and NOT altered by the 7/1/2026 code cycle per the city's own current page; 2024 International Energy Conservation Code (IECC), commercial provisions — Riverton City Code § 15.10.010; Utah Code § 15A-2-103(1)(h); effective 2026-07-01, superseded the 2021 edition that had been in effect since July 1, 2023; 2024 International Existing Building Code (IEBC) — Riverton City Code § 15.10.010; Utah Code § 15A-2-103(1)(i); effective 2026-07-01, superseded the 2021 edition that had been in effect since July 1, 2023; ICC/ANSI A117.1-2009 — rivertonutah.gov/building/code.php item 10; 2024 International Swimming Pool and Spa Code (ISPSC), residential provisions — Utah Code § 15A-2-103(1)(n); effective 2026-07-01, superseded the 2021 edition that had been in effect since July 1, 2023; NOTE (verified 2026-07-16): Riverton's own 'Building Codes in Use in Riverton City' list at rivertonutah.gov/building/code.php is headed 'Effective July 1, 2023' and still enumerates the 2021 IBC/IRC/IPC/IMC/IFGC, 2021 IEBC, and 2021 ISPSC, plus 'Commercial provisions of the 2021 International Energy Conservation Code' — that page has NOT been updated for the 7/1/2026 code cycle. However, Riverton City Code § 15.10.010 itself dynamically adopts 'the most recent version... adopted by the state of Utah' and states that state updates automatically update Riverton's code with no separate city action required — so as a matter of law the 2024 editions already govern in Riverton regardless of the outdated summary page. Confirmed directly against Utah Code § 15A-2-103 (version effective 7/1/2026, superseded 1/1/2027) at le.utah.gov.. Local amendments apply — see the Riverton overview page for the full list.

Most likely yes. Utah state law (HB 82, 2021) requires cities to allow internal ADUs. Riverton may also allow detached ADUs depending on zoning. Contact Riverton Planning & Zoning at 801-208-3149 to confirm your property qualifies and review setback requirements.

Sources & verification

Verified against official sources. Last reviewed 2026-07-01.

Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Riverton building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

Other permits in Riverton

Residential Building PermitElectrical PermitPlumbing PermitMechanical / HVAC PermitRoofing Permit (Re-Roof)Solar Panel PermitDeck PermitBasement Finish PermitDemolition PermitCommercial Building PermitCommercial Tenant Improvement / Tenant Finish PermitSign PermitFire Sprinkler & Fire Alarm PermitEV Charger / EVSE PermitChange of Use / Certificate of Occupancy Compliance

Accessory Dwelling Unit (ADU) in other cities

Bountiful, UtahDraper, UtahEagle Mountain, UtahKaysville, UtahLayton, UtahLehi, UtahLogan, UtahNorth Salt Lake, Utah

Compare accessory dwelling unit (adu) fees across Utah →

Look up this fee in a different city →

Embed this data card →

Related guides

ADU / In-Law Suite

Now live

Build your Riverton project checklist

Describe your project once and get every permit, document, and fee it triggers in Riverton — in one checklist. Sign up and pay once to generate it, or go unlimited with Pro.

Get started →