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Residential Building Permit (New Construction) in Unincorporated Natrona County, Wyoming

Required for new single-family dwellings and other new one- and two-family residential construction in unincorporated Natrona County. Reviewed under the 2024 IRC as adopted by the Natrona County Building Department (Resolution 90-24).

Verified 2026-07-01 · Source

When you need this permit

  • Building permit application (Residential or Commercial) submitted to the Natrona County Building Department, in person, by mail, or online via ViewPointCloud
  • Specify building type (Single Family Dwelling, Multifamily, IRC/Manufactured, HUD/Mobile Home, Commercial/Industrial), construction type (Concrete/Block, Steel, Heavy Timber, Stick Frame, Post Frame/Pole Barn), and foundation type (Crawl Space, Basement, Caissons/Piers, Concrete Slab, Shallow Monolithic)
  • Water and sewer source must be identified (Public/Septic, Public/Well) — septic requires coordination with Casper-Natrona County Health Department
  • Job/market valuation of work must be declared on the application — this determines the permit fee under the county's valuation-based fee table
  • Contractor performing work must hold a current Natrona County contractor license (Class I, II, or III General Contractor) with active insurance on file; permits will not be approved if the contractor's license or insurance has expired Contractor
  • Applicant acknowledges compliance with all Natrona County adopted Building Codes and State laws, and that the building does not violate any restrictive covenant

Required documents

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Fee schedule

Building Permit Fee — valuation $0–$2,500Natrona County Permit Fees, Resolution No. 45-20 (effective January 2024–current)
$70
Building Permit Fee — valuation $2,501–$5,000
$100
Building Permit Fee — valuation $5,001–$7,500
$170
Building Permit Fee — valuation $7,501–$12,500
$233
Building Permit Fee — valuation $12,501–$17,500
$294
Building Permit Fee — valuation $17,501–$22,500
$356
Building Permit Fee — valuation $47,501–$52,500Table continues in $5,000 valuation bands from $22,500 up to $98,000 — see full Resolution 45-20 table for all bands
$627
Building Permit Fee — valuation $92,501–$98,000
$905
Building Permit Fee — valuation over $98,000
$905 plus $9.24 for each additional $1,000 or fraction thereof
Work done without an approved permitEmergencies as defined in the adopted codes are exempt from the triple-fee penalty
Tripled original permit fee

Review timeline

Plan reviewTypical estimate — confirm current times with the Unincorporated Natrona County building department
~5–15 business days

How long did your Residential Building Permit (New Construction) 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

    Before concrete pour — verify footing dimensions, reinforcement, and foundation type

  2. 2

    Framing

    After framing complete, before insulation or wall cover

  3. 3

    MEP Rough-In

    Mechanical, electrical, and plumbing rough-in before walls closed; scheduled with the Building Department at 307-235-9435

  4. 4

    Final

    All work complete per approved plans and adopted codes, ready for occupancy

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

Tips

  • Natrona County charges ALL permit types (building, electrical, plumbing, mechanical, roofing) under one combined valuation-based fee table — the 'Job Valuation' you declare on the application directly sets your fee band.
  • Contact the Building Department (307-235-9435) before submitting if you are unsure whether your contractor's license is current — expired licenses or insurance will block permit approval. Contractor
  • Building without an approved permit triples your fee — get the permit before work commences.
  • This unincorporated-county page is distinct from the City of Casper (the county seat), which runs its own separate municipal building department; confirm you are outside Casper's city limits before using this page's permit process.

Frequently asked questions

Unincorporated Natrona County requires a residential building permit (new construction) for: Building permit application (Residential or Commercial) submitted to the Natrona County Building Department, in person, by mail, or online via ViewPointCloud; Specify building type (Single Family Dwelling, Multifamily, IRC/Manufactured, HUD/Mobile Home, Commercial/Industrial), construction type (Concrete/Block, Steel, Heavy Timber, Stick Frame, Post Frame/Pole Barn), and foundation type (Crawl Space, Basement, Caissons/Piers, Concrete Slab, Shallow Monolithic); Water and sewer source must be identified (Public/Septic, Public/Well) — septic requires coordination with Casper-Natrona County Health Department; Job/market valuation of work must be declared on the application — this determines the permit fee under the county's valuation-based fee table; Contractor performing work must hold a current Natrona County contractor license (Class I, II, or III General Contractor) with active insurance on file; permits will not be approved if the contractor's license or insurance has expired; Applicant acknowledges compliance with all Natrona County adopted Building Codes and State laws, and that the building does not violate any restrictive covenant. If your project isn't listed, confirm with Natrona County Building Department at (307) 235-9435 before starting work.

Fees are valuation-based per Resolution No. 45-20: from $70 for work valued $0–$2,500 up to $905 plus $9.24 per additional $1,000 for work valued over $98,000. All trades (building, electrical, plumbing, mechanical) share this same fee table.

Plan review for a residential building permit (new construction) in Unincorporated Natrona County typically runs 5–15 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). Depending on your project, Unincorporated Natrona County may also ask for: Address Request Form (if address not yet assigned). See the required-documents checklist on this page for details on each.

Unincorporated Natrona County requires 4 inspection(s) for a residential building permit (new construction), in order: Footing / Foundation, 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.

Yes. Natrona County holds delegated building authority under W.S. § 35-9-121 and issues its own building permits for unincorporated county territory, reviewed under the adopted 2024 IRC. Apply via the Natrona County Building Department (307-235-9435) or online at natronacountywy.viewpointcloud.com.

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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