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Detached Accessory Dwelling Unit (DADU) Permit — Plain City, Utah · Requirements sheet
Verified 2026-07-08 · Source: https://www.plaincityutah.gov/DocumentCenter/View/487/Detached-Accessory-Dwelling-Unit-Application
PermitBase is an independent reference and is not affiliated with any government agency. Requirements change and vary by project — confirm current details with the building department before you submit.
Detached Accessory Dwelling Unit (DADU) Permit in Plain City, Utah
Required for a Detached Accessory Dwelling Unit in Plain City — a detached structure, or a unit above/behind a detached garage, associated with a single-family dwelling. Governed by Plain City Code § 10-21 (adopted by Ord. 2022-10, 7-21-2022). Requires staff approval prior to issuance of the underlying building permit.
Verified 2026-07-08 · Source
When you need this permit
- Lot must be at least 18,500 square feet
- Detached structure, or a unit above/behind a detached garage, associated with a single-family dwelling
- Owner-occupied; the DADU is not intended for resale and must be sold together with the primary dwelling Owner-builder
- Unit may not be rented on a transient basis (periods less than 30 days); if used as a longer-term rental, the primary owner must hold a Home Occupation License
- Address must match the primary dwelling, designated as 'unit B'
- Comply with all building, fire, and health codes — building permit required, impact fees required
- Unit at least 10 feet from the primary dwelling; limited to 25% of the rear yard; minimum 25% of the unit located in the rear yard; meets accessory-building setbacks
- Adequate off-street parking on an approved surface; additional driveways at least 50 feet apart and at least 30 feet from an intersection
- Utility meter: primary house with a detached unit may have no more than two water, gas, and electricity services, in the property owner's name
Required documents
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Fee schedule
DADU (Detached Dwelling Accessory Dwelling) Filing FeeConfirmed by two independent official Plain City sources: (1) the Detached Accessory Dwelling Unit (DADU) Application form (Doc 487), which states 'DADU fee: $50.00' directly on the application; and (2) Plain City Fee Schedule, Resolution #2024-07, Exhibit A, 'Filing Fees' section: 'Detached Dwelling Accessory Dwelling (DADU) fee — $50.00.'
$50.00
Review timeline
Plan review
Not published — contact the department
Inspection process
See the full Plain City inspection guide — scheduling & re-inspection fees →
Tips
- Requests for DADUs must be approved by city staff prior to the issuance of the underlying building permit, per the DADU Application form (citing Ord. 2022-10, 7-21-2022, eff. 7-21-2022).
- A future purchaser of the property must reauthorize the DADU to continue its use — the accessory dwelling unit designation does not automatically transfer with a sale beyond the original owner-occupant. Owner-builder
- The DADU may not be used as a short-term rental (under 30 days) under any circumstances, per the Owner Occupancy Affidavit within the DADU Application.
Frequently asked questions
Plain City requires a detached accessory dwelling unit (dadu) permit for: Lot must be at least 18,500 square feet; Detached structure, or a unit above/behind a detached garage, associated with a single-family dwelling; Owner-occupied; the DADU is not intended for resale and must be sold together with the primary dwelling; Unit may not be rented on a transient basis (periods less than 30 days); if used as a longer-term rental, the primary owner must hold a Home Occupation License; Address must match the primary dwelling, designated as 'unit B'; Comply with all building, fire, and health codes — building permit required, impact fees required; Unit at least 10 feet from the primary dwelling; limited to 25% of the rear yard; minimum 25% of the unit located in the rear yard; meets accessory-building setbacks; Adequate off-street parking on an approved surface; additional driveways at least 50 feet apart and at least 30 feet from an intersection; Utility meter: primary house with a detached unit may have no more than two water, gas, and electricity services, in the property owner's name. If your project isn't listed, confirm with Plain City Building Department at (801) 731-4908 before starting work.
The DADU filing fee is $50.00, confirmed on both the official DADU Application form and Plain City's Fee Schedule (Resolution #2024-07). A separate building permit (with its own impact fees) is also required for construction of the unit itself.
Plain City does not publish a plan-review timeline for this permit. Contact Plain City Building Department at (801) 731-4908 for current turnaround.
You'll need: Detached Accessory Dwelling Unit (DADU) Application; Completed Building Permit Application with engineered plans and plot plan. Depending on your project, Plain City may also ask for: Home Occupation License Application. See the required-documents checklist on this page for details on each.
Apply through Plain City Building Department at 4160 W 2200 N, Plain City, UT 84404. Phone: (801) 731-4908. Office hours: Mon–Thurs 8:00 AM – 5:00 PM; Fri 8:00 AM – 12:00 PM noon; closed Saturday and Sunday. Official information: https://www.plaincityutah.gov/1268/Building.
Plain City, Utah has adopted: International Building Code (IBC) — adopted per Plain City Code § 9-1-1(A) pursuant to Utah Code Annotated § 58-56-4(2) and Utah Administrative Code R156-56-701, as modified by chapter 11 of the supplement to the IBC promulgated by the International Code Council, and amended per statewide amendments in Utah Administrative Code R156-56-704 (automatically updated per § 9-1-1(C) whenever the Division of Occupational and Professional Licensing/Uniform Building Code Commission adopts new statewide amendments). Per Utah Code § 15A-2-103 (re-verified live 2026-07-23), the statewide-adopted edition is now the 2024 IBC (including Appendices C and J), which took effect July 1, 2026 and supersedes the prior 2021 IBC edition (effective July 1, 2023 through June 30, 2026) — Plain City's automatic-adoption clause carries this forward without any local ordinance action required.; International Residential Code (IRC) — adopted by reference within IBC standards per Plain City Code § 9-1-1(A) ('...together with standards incorporated into the IBC by reference, including...the international residential code (IRC) promulgated by the International Code Council'). Statewide-adopted edition is the 2021 IRC per Utah Code § 15A-2-103 — re-verified live 2026-07-23; the 2026-07-01 statewide IBC transition to the 2024 edition did NOT carry the IRC forward, so 2021 remains current.; International Energy Conservation Code (IECC) — adopted by reference within IBC standards per Plain City Code § 9-1-1(A). Utah Code § 15A-2-103(1)(h) specifies the current statewide-adopted edition as the 2024 IECC (re-verified live 2026-07-23). Plain City's Residential Building Permit Plan Submittal Requirements (Doc 475) additionally requires a REScheck energy analysis report showing compliance with the model energy code, passing by a minimum of 3% if using the Utah Energy Conservation Method.; Statewide plumbing, mechanical, and electrical codes (IPC/IMC/NEC) apply uniformly across Utah municipalities under the State Construction Code (Utah Code Title 15A) but are not separately codified in Plain City's own municipal code sections located during this research; Plain City's plan submittal checklists (Docs 475, Accessory Building Doc) require electrical, plumbing, and mechanical plans as part of the IRC-governed construction drawings, consistent with statewide adoption rather than a distinct local ordinance.. Local amendments apply — see the Plain City overview page for the full list.
18,500 square feet, per Plain City Code § 10-21-2 as reflected in the official DADU Application Qualifications Checklist.
Sources & verification
Verified against official sources. Last reviewed 2026-07-08.
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 Plain City building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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