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Commercial Tenant Improvement / Tenant Finish Permit in Unincorporated Duchesne County, Utah

Required for interior tenant-improvement and tenant-finish work within existing commercial space in unincorporated Duchesne County. The county's Permit Packet does not publish a distinct tenant-improvement fee category or submittal checklist — the same valuation-based fee, 35%-65% plan review range, and 1% state surcharge documented for the Commercial Building Permit apply, scoped to the actual work performed.

Reviewed 2026-07-19 · Source

When you need this permit

  • Interior tenant-improvement or tenant-finish work inside existing commercial space
  • Complete construction documents scoped to the work performed (floor plan, electrical/mechanical/plumbing plans as applicable)
  • Zoning verification if the tenant improvement involves a change of use or occupancy classification

Required documents

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Fee schedule

Building Permit Fee (Valuation-Based)Duchesne County Permit Packet — same generic valuation methodology; the county does not itemize tenant improvement as its own fee category.
Calculated from the county-adopted cost-per-square-foot valuation table
Plan Review FeeDuchesne County Permit Packet — same range documented for the Commercial Building Permit; not confirmed to be TI-specific.
35% to 65% of the building permit fee
State SurchargeDuchesne County Permit Packet
1% of the building permit fee

Review timeline

Plan review
Not published — contact the department

How long did your Commercial Tenant Improvement / Tenant Finish Permit permit actually take in Unincorporated Duchesne County?

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

Inspection process

  1. 1

    Rough Electrical / Plumbing / Mechanical

    As applicable to the tenant-improvement scope, before wall closure.

  2. 2

    Final

    A Certificate of Occupancy is required before the space may be occupied or used.

See the full Unincorporated Duchesne County inspection guide — scheduling & re-inspection fees →

Tips

  • Duchesne County has no dedicated tenant-improvement fee schedule — expect the same valuation-based fee and 35%-65% plan review range documented for new commercial construction, scaled to your project's declared valuation.
  • Confirm with the Department of Building Safety ((435) 738-1150) whether your specific tenant-finish scope triggers a Fire Warden/Fire Marshal review, particularly if it's within or near a Wildland Urban Interface area.

Frequently asked questions

Unincorporated Duchesne County requires a commercial tenant improvement / tenant finish permit for: Interior tenant-improvement or tenant-finish work inside existing commercial space; Complete construction documents scoped to the work performed (floor plan, electrical/mechanical/plumbing plans as applicable); Zoning verification if the tenant improvement involves a change of use or occupancy classification. If your project isn't listed, confirm with Duchesne County Department of Building Safety at (435) 738-1150 before starting work.

No. Duchesne County's Permit Packet does not itemize a distinct tenant-improvement fee — TI projects are billed under the same valuation-based Building Permit Fee and 35%-65% Plan Review Fee range documented for new commercial construction.

Unincorporated Duchesne County does not publish a plan-review timeline for this permit. Contact Duchesne County Department of Building Safety at (435) 738-1150 for current turnaround.

You'll need: Building Permit Application; Scope-Appropriate Plan Set. See the required-documents checklist on this page for details on each.

Unincorporated Duchesne County requires 2 inspection(s) for a commercial tenant improvement / tenant finish permit, in order: Rough Electrical / Plumbing / Mechanical, Final. Schedule each through Duchesne County Department of Building Safety ((435) 738-1150).

Apply through Duchesne County Department of Building Safety at 734 North Center Street, P.O. Box 317, Duchesne, UT 84021-0317. Phone: (435) 738-1150, email: Building@duchesne.utah.gov. Office hours: Mon–Fri 8:30 AM – 5:00 PM (closed state and federal holidays); Planning & Zoning zoning-clearance line (435) 738-1135 or 1152. Official information: https://duchesne.utah.gov/gov/dept/building-inspector/.

Unincorporated Duchesne County, Utah has adopted: 2024 International Building Code (IBC), including Appendices C and J — Utah Code § 15A-2-103(1)(a); current edition as of July 1, 2026 (2021 edition governed through June 30, 2026); 2021 International Residential Code (IRC), plus Appendix AQ of the 2021 IRC — Utah Code § 15A-2-103(1)(b)/(c); unchanged by the July 1, 2026 revision — still the current edition; 2024 International Plumbing Code (IPC) — Utah Code § 15A-2-103(1)(d); current edition as of July 1, 2026 (2021 edition, including Utah amendment P2602.3 (individual water supply), governed through June 30, 2026 — confirm the amendment still applies against the 2024 base edition); 2024 International Mechanical Code (IMC) — Utah Code § 15A-2-103(1)(e); current edition as of July 1, 2026 (2021 edition governed through June 30, 2026); 2024 International Fuel Gas Code (IFGC) — Utah Code § 15A-2-103(1)(f); current edition as of July 1, 2026 (2021 edition governed through June 30, 2026); 2024 International Energy Conservation Code (IECC) — Utah Code § 15A-2-103(1)(h); current edition as of July 1, 2026 (2021 edition governed through June 30, 2026); statute has no residential/commercial split — one edition applies to both; 2024 International Existing Building Code (IEBC) — Utah Code § 15A-2-103(1)(i); current edition as of July 1, 2026 (2021 edition governed through June 30, 2026); 2024 International Swimming Pool and Spa Code (ISPSC), residential provisions — Utah Code § 15A-2-103(1)(n). ADDED 2026-07-16: this code is not listed on Duchesne County's own permit materials, but it is adopted statewide by statute, so it applies here regardless of the county page's omission.; 2023 National Electrical Code (NEC) — Utah Code § 15A-2-103(1)(g); statewide in force, unchanged by the July 1, 2026 revision; Utah State Amendment to IBC Section 1807 (Empirical Concrete Foundation Design, Table 1807.1.6.4) — Duchesne County Permit Packet, dated July 1, 2023; Utah Wildland Urban Interface Code — adopted under Utah Code § 15A-2-103; a Pre-site/WUI evaluation is a required inspection for new construction in Duchesne County; NOTE (verified 2026-07-16 against the live Utah Code § 15A-2-103 text, version headed 'Effective 7/1/2026 / Superseded 1/1/2027'): the 2024 editions of IBC, IPC, IMC, IFGC, IECC, and IEBC listed above took effect July 1, 2026, replacing the 2021 editions; IRC (2021) and NEC (2023) did not change. The 1/1/2027 version of the statute carries identical editions, so no further flip is expected then. This file previously forecast this change but still led with the 2021 editions as current — corrected on this date.. Local amendments apply — see the Unincorporated Duchesne County overview page for the full list.

Sources & verification

Key facts verified against official sources. Last reviewed 2026-07-19.

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 Unincorporated Duchesne County building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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