How much does a building permit cost in unincorporated Natrona County, WY?

Fees are calculated as: Valuation-based. Project valuation is calculated using four components: labor, materials, overhead, and profit. Alternatively, the contractor's total contract price (including all materials and labor) may be used to establish valuation..

How long does it take to get a building permit in unincorporated Natrona County, WY?

Typical processing time is Up to 10 business days for plan review once all documents are received..

What work is exempt from building permits in unincorporated Natrona County, WY?

The following work is generally exempt: Fences up to 7 feet in height (a zoning certificate is still required); Emergency equipment replacements (permit obtained the next business day). Note: The publicly available FAQs do not provide an exhaustive list of exempt work categories. Contact the Building Department at (307) 235-9435 to confirm exemption status for a specific project.

How do I schedule a building inspection in unincorporated Natrona County, WY?

Inspections can be scheduled via: (307) 235-9435, OpenGov portal. Requests should be submitted at least one business day in advance; up to 48 hours notice may be needed during busy periods..

County Building Permits

Natrona County, WY - 2026 Building Permit Guide

How to apply for a building permit in unincorporated Natrona County, Wyoming. Permit authority, application steps, fees, and inspection requirements.

Wyoming Updated March 2026

Permit Authority

All unincorporated areas of Natrona County. Does not cover incorporated municipalities (Casper, Mills, Evansville, Bar Nunn, Midwest, Edgerton), which each administer their own permit programs.

Department: Natrona County Building Department
Address: 200 N. Center Street, Room 205, Casper, WY 82601
Phone: (307) 235-9435
Email: building@natronacounty-wy.gov
Website: https://www.natronacounty-wy.gov/170/Building-Inspection

Online Permit Portal

Open OpenGov Permitting and Licensing

Platform: OpenGov • Account required: Yes • Submission: Online only

Additional resources:

Application Process

Determine whether your project requires a permit by contacting the Building Department at (307) 235-9435 or reviewing the FAQ.
Prepare required documents: completed Building Permit Application, site plan, copy of building plans (some projects require plans stamped by a Wyoming-licensed Professional Engineer), and applicable fees.
Submit application, site plan, plans, and fees to the Building Department in person at Room 205 or through the OpenGov online portal.
Staff reviews submission for compliance with adopted building codes and zoning regulations.
Plan review takes up to ten (10) business days once all documents are received.
Upon approval, permit is issued. Post the permit on-site before starting work.
Schedule required inspections throughout construction. Inspections can typically be scheduled for the next business day (up to 48 hours during busy periods).
Pass all required inspections and obtain final sign-off.

Typical processing time: Up to 10 business days for plan review once all documents are received.

Source: Natrona County Building Department

General Requirements

Permits are required for new buildings (residential and commercial), additions (bedrooms, bathrooms, family rooms, etc.), residential work (decks, garages, fences over 7 feet, fireplaces, water heaters), renovations (garage conversions, basement finishing), and electrical, plumbing, and mechanical (HVAC) systems.

Required Documents

Building Permit Application
Site plan
Copy of building plans (PE-stamped plans required for some projects)
Applicable fees

Permit validity: Permits expire 180 days from issuance. A permit becomes void if work is not started within 6 months of issuance or if work is suspended for 6 months after commencement.
Building code: 2024 International Building Code (Resolution 84-24), 2024 International Existing Building Code (Resolution 85-24), 2024 International Fire Code (Resolution 86-24), 2024 International Fuel Gas Code (Resolution 87-24), 2024 International Mechanical Code (Resolution 88-24), 2024 International Plumbing Code (Resolution 89-24), 2024 International Residential Code (Resolution 90-24), 2023 National Electrical Code (NFPA 70).
Owner-builder: Property owners may obtain permits and perform mechanical, electrical, and/or plumbing work on their own private residential property if it is their primary residence. Work must comply with adopted building codes and all required inspections must be obtained.
Contractor requirements: All contractors performing work in the unincorporated county must be currently licensed by Natrona County. Licenses expire December 31 each year and must be renewed annually. Contractors must carry public liability insurance ($100,000 per person / $300,000 per incident minimum) and property damage insurance ($100,000 per incident minimum).

Fees

Permit fee formula: Valuation-based. Project valuation is calculated using four components: labor, materials, overhead, and profit. Alternatively, the contractor's total contract price (including all materials and labor) may be used to establish valuation.
Payment note: Fees are due at time of permit application submission.

Fees change. Verify current amounts at the official fee schedule (effective 2024).

Work That Does NOT Require a Permit

Contact the Natrona County Building Department to confirm whether your project requires a permit before starting work.

Inspections

How to Schedule

(307) 235-9435 (phone)
OpenGov portal (online)

Scheduling deadline: Requests should be submitted at least one business day in advance; up to 48 hours notice may be needed during busy periods.
Inspection hours: Monday-Friday, 8:00 AM to 5:00 PM

Typical inspection sequence: Varies by project type. For new construction, typical sequence includes foundation/footing inspection, framing/rough inspection, insulation, and final inspection. Separate inspections are required for electrical, plumbing, and mechanical rough-in and finals.

Additional Resources

Building code: 2024 International Building Code (Resolution 84-24), 2024 International Existing Building Code (Resolution 85-24), 2024 International Fire Code (Resolution 86-24), 2024 International Fuel Gas Code (Resolution 87-24), 2024 International Mechanical Code (Resolution 88-24), 2024 International Plumbing Code (Resolution 89-24), 2024 International Residential Code (Resolution 90-24), 2023 National Electrical Code (NFPA 70).
Zoning information: View zoning info
Planning and Zoning
Fire Protection Permits
License lookup guide: Wyoming Contractor License Requirements
Contract template: Wyoming Homeowner-Contractor Agreement
Wyoming hub: Wyoming Contractor License & Permit Hub

Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the Natrona County Building Department before applying.

Frequently Asked Questions

Natrona County Building Permit FAQ

Do I need a building permit in unincorporated Natrona County, WY?: Permits are required for new buildings (residential and commercial), additions (bedrooms, bathrooms, family rooms, etc.), residential work (decks, garages, fences over 7 feet, fireplaces, water heaters), renovations (garage conversions, basement finishing), and electrical, plumbing, and mechanical (HVAC) systems.
How much does a building permit cost in unincorporated Natrona County, WY?: Fees are calculated as: Valuation-based. Project valuation is calculated using four components: labor, materials, overhead, and profit. Alternatively, the contractor's total contract price (including all materials and labor) may be used to establish valuation..
How do I apply for a building permit in unincorporated Natrona County, WY?: 1. Determine whether your project requires a permit by contacting the Building Department at (307) 235-9435 or reviewing the FAQ. 2. Prepare required documents: completed Building Permit Application, site plan, copy of building plans (some projects require plans stamped by a Wyoming-licensed Professional Engineer), and applicable fees. 3. Submit application, site plan, plans, and fees to the Building Department in person at Room 205 or through the OpenGov online portal. 4. Staff reviews submission for compliance with adopted building codes and zoning regulations. 5. Plan review takes up to ten (10) business days once all documents are received. 6. Upon approval, permit is issued. Post the permit on-site before starting work. 7. Schedule required inspections throughout construction. Inspections can typically be scheduled for the next business day (up to 48 hours during busy periods). 8. Pass all required inspections and obtain final sign-off.
How long does it take to get a building permit in unincorporated Natrona County, WY?: Typical processing time is Up to 10 business days for plan review once all documents are received..
What work is exempt from building permits in unincorporated Natrona County, WY?: The following work is generally exempt: Fences up to 7 feet in height (a zoning certificate is still required); Emergency equipment replacements (permit obtained the next business day). Note: The publicly available FAQs do not provide an exhaustive list of exempt work categories. Contact the Building Department at (307) 235-9435 to confirm exemption status for a specific project.
How do I schedule a building inspection in unincorporated Natrona County, WY?: Inspections can be scheduled via: (307) 235-9435, OpenGov portal. Requests should be submitted at least one business day in advance; up to 48 hours notice may be needed during busy periods..

Need help with your project?

Navigating permits in Natrona County (Unincorporated Area) can be complicated.

Jaspector connects you with local experts who can review your scope, verify your contractor, and help you understand what permits your project actually needs.

Learn how Jaspector works

Important: This page is an educational resource provided by jaspector.com. It is not legal advice, and it does not substitute for official guidance from the permit authority listed above. Permit requirements, fees, and processes change frequently. Always verify current requirements directly with the issuing department before beginning any construction project. Use of this page does not create an attorney-client relationship. Jaspector assumes no liability for any outcomes arising from reliance on this information.

← Back to Natrona County permit guides