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Commercial Tenant Improvement Permit in Unincorporated Natrona County, Wyoming

Required for interior alterations, remodels, or repairs to existing commercial/industrial buildings in unincorporated Natrona County. Uses the same combined Building Permit Application (select Building Use: Commercial; Type of Work: Remodel or Repair), reviewed under the 2024 IBC and IEBC as adopted.

Verified 2026-07-01 · Source

When you need this permit

  • Same Natrona County Building Permit Application as residential work; select Building Use = Commercial and the applicable Type of Work (Remodel, Addition, Repair)
  • Building Type on the application should reflect Commercial/Industrial
  • Job valuation of the tenant improvement work must be declared for fee calculation
  • Reviewed under the 2024 International Building Code (IBC, Resolution 84-24) and 2024 International Existing Building Code (IEBC, Resolution 85-24) for alterations to existing structures
  • Separate Electrical, Plumbing, and Mechanical permits required for any trade work within the tenant space
  • Contractor must hold the applicable current Natrona County contractor license (General Contractor Class I/II/III depending on project scope) with active insurance Contractor

Required documents

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Fee schedule

Building Permit Fee — valuation-based (same table as all building permits)Natrona County Permit Fees, Resolution No. 45-20 — commercial tenant improvements use the identical valuation-based schedule as residential work; no separate commercial fee table exists.
$70 (valuation $0–$2,500) up to $905 plus $9.24 per additional $1,000 over $98,000
Compliance Inspection — CommercialApplies if work commenced before permit approval
$300

Review timeline

Plan reviewTypical estimate — confirm current times with the Unincorporated Natrona County building department
~5–20 business days

How long did your Commercial Tenant Improvement Permit permit actually take in Unincorporated Natrona County?

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

Inspection process

  1. 1

    Framing / Structural

    For any structural alterations, before wall cover

  2. 2

    MEP Rough-In

    Electrical, plumbing, mechanical rough-in before walls closed (separate trade permits required)

  3. 3

    Final

    Life-safety, egress, and code compliance verified for occupancy

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

Tips

  • Natrona County uses ONE combined building permit application and ONE valuation-based fee table for both residential and commercial work — there is no separate 'commercial' fee schedule to look up.
  • Existing commercial buildings undergoing alteration are reviewed under the 2024 IEBC in addition to the 2024 IBC — this governs how much of the existing structure must be brought up to current code.

Frequently asked questions

Unincorporated Natrona County requires a commercial tenant improvement permit for: Same Natrona County Building Permit Application as residential work; select Building Use = Commercial and the applicable Type of Work (Remodel, Addition, Repair); Building Type on the application should reflect Commercial/Industrial; Job valuation of the tenant improvement work must be declared for fee calculation; Reviewed under the 2024 International Building Code (IBC, Resolution 84-24) and 2024 International Existing Building Code (IEBC, Resolution 85-24) for alterations to existing structures; Separate Electrical, Plumbing, and Mechanical permits required for any trade work within the tenant space; Contractor must hold the applicable current Natrona County contractor license (General Contractor Class I/II/III depending on project scope) with active insurance. If your project isn't listed, confirm with Natrona County Building Department at (307) 235-9435 before starting work.

No. Natrona County uses a single combined, valuation-based fee table (Resolution No. 45-20) for both residential and commercial building, electrical, plumbing, and mechanical permits — the same $70-to-$905-plus-$9.24/$1,000 schedule applies to commercial tenant improvements.

Plan review for a commercial tenant improvement permit in Unincorporated Natrona County typically runs 5–20 business days. This is an estimate, not a published figure — confirm current review times with Natrona County Building Department at (307) 235-9435.

You'll need: Natrona County Building Permit Application (2025). Depending on your project, Unincorporated Natrona County may also ask for: Site Plan Application (2025). See the required-documents checklist on this page for details on each.

Unincorporated Natrona County requires 3 inspection(s) for a commercial tenant improvement permit, in order: Framing / Structural, MEP Rough-In, Final. Schedule each through Natrona County Building Department ((307) 235-9435).

Apply through Natrona County Building Department at 200 N. Center St, Room 205, Casper, WY 82601. Phone: (307) 235-9435, email: Contact via natronacounty-wy.gov (email obfuscated on site; call 307-235-9435). Office hours: Monday–Friday, 8:00 AM–5:00 PM. Official information: https://www.natronacounty-wy.gov/170/Building-Inspection.

Unincorporated Natrona County, Wyoming has adopted: 2024 International Building Code (IBC) — adopted by Resolution 84-24; 2024 International Residential Code (IRC) — adopted by Resolution 90-24; 2024 International Existing Building Code (IEBC) — adopted by Resolution 85-24; 2024 International Fire Code (IFC) — adopted by Resolution 86-24; 2024 International Fuel Gas Code (IFGC) — adopted by Resolution 87-24; 2024 International Mechanical Code (IMC) — adopted by Resolution 88-24; 2024 International Plumbing Code (IPC) — adopted by Resolution 89-24; 2023 National Electrical Code (NEC / NFPA 70) — adopted by county resolution. Local amendments apply — see the Unincorporated Natrona County overview page for the full list.

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

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Commercial Tenant Improvement Permit in other cities

Casper, WyomingCheyenne, WyomingEvanston, WyomingGillette, WyomingGreen River, WyomingJackson, WyomingLaramie, WyomingRiverton, Wyoming

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