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Residential Addition / Remodel Permit in Unincorporated Natrona County, Wyoming

Required for additions, remodels, basement finishes, and repairs to existing one- and two-family dwellings in unincorporated Natrona County. Uses the same combined Building Permit Application as new construction (select 'Remodel,' 'Addition,' or 'Repair' as Type of Work).

Verified 2026-07-01 · Source

When you need this permit

  • Same Building Permit Application form as new construction; select Type of Work: Remodel, Addition, or Repair
  • Declare whether work has already commenced (application asks 'Has work commenced on this project? Yes/No')
  • Existing and proposed bedroom/bathroom counts must be listed for additions/remodels affecting habitable space
  • Job valuation must be declared — fee is set by the same valuation-based table used for new construction
  • Licensed, currently-insured Natrona County contractor required unless the property owner is performing the work themselves

Required documents

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Fee schedule

Building Permit Fee — valuation-based (same table as new construction)Natrona County Permit Fees, Resolution No. 45-20 — remodels/additions/repairs use the identical valuation-based schedule as new construction; no separate remodel fee line exists.
$70 (valuation $0–$2,500) up to $905 plus $9.24 per additional $1,000 over $98,000
Compliance Inspection (if construction started without a permit)Resolution No. 45-20; also see Compliance Inspection Application form
$150 residential / $300 commercial

Review timeline

Plan reviewTypical estimate — confirm current times with the Unincorporated Natrona County building department
~3–10 business days

How long did your Residential Addition / Remodel 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

    Footing / Foundation (if new footings added)

    Before concrete pour, for additions with new foundation work

  2. 2

    Framing

    After framing complete, before insulation or wall cover

  3. 3

    MEP Rough-In

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

  4. 4

    Final

    All work complete per approved plans

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

Tips

  • Basement finishes are explicitly listed as a 'Nature of Project' option on the county's building, electrical, plumbing, and mechanical permit applications — a basement finish involving any trade work needs the corresponding trade permit(s) in addition to the building permit.
  • If construction already commenced before a permit was obtained, expect a Compliance Inspection ($150 residential/$300 commercial) in addition to the standard (tripled) permit fee.

Frequently asked questions

Yes. 'Basement Finish' is a listed project type on the county's Building, Electrical, Plumbing, and Mechanical permit applications. You need a building permit for the finish work and separate trade permits for any electrical, plumbing, or mechanical work involved.

In Unincorporated Natrona County, the published Building Permit Fee — valuation-based (same table as new construction) is: $70 (valuation $0–$2,500) up to $905 plus $9.24 per additional $1,000 over $98,000. Additional published fees: Compliance Inspection (if construction started without a permit) — $150 residential / $300 commercial. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for a residential addition / remodel permit in Unincorporated Natrona County typically runs 3–10 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 (Residential or Commercial, 2025 form); Site Plan Application (2025). See the required-documents checklist on this page for details on each.

Unincorporated Natrona County requires 4 inspection(s) for a residential addition / remodel permit, in order: Footing / Foundation (if new footings added), Framing, 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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Residential Addition / Remodel Permit in other cities

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