On this page 6
§ 02
When a permit is required
Permit triggers and exempt work for Casper
Permits must be obtained before construction of a new building or addition, or the remodel, alteration, or repair of any existing structure within the City of Casper.
Single-story unheated detached storage structures under 120 square feet (a free Fence/Shed permit is still required)
Fences not exceeding 6 feet in height (a free Fence/Shed permit is still required)
Retaining walls under 4 feet high (specific conditions apply)
Flatwork (walkways, driveways) not exceeding 30 inches above grade
Interior finishing work (painting, flooring, trim)
- Exempt Single-story unheated detached storage structures under 120 square feet (a free Fence/Shed permit is still required)
- Exempt Fences not exceeding 6 feet in height (a free Fence/Shed permit is still required)
- Exempt Retaining walls under 4 feet high (specific conditions apply)
- Exempt Flatwork (walkways, driveways) not exceeding 30 inches above grade
- Exempt Interior finishing work (painting, flooring, trim)
Note: Even for exempt structures, the free Fence/Shed permit must be obtained.
Required documents
- Residential interior remodel: Basic plan with fundamental information
- Residential exterior addition or garage: Plot plan plus plans showing foundation design, room sizes, windows, and related details; soils report/engineered foundation plan for new construction; wall bracing plan
- Commercial: Life-safety plans, engineered building and site plans, Planning/Zoning approval documentation
- Specialized checklists available for residential and commercial projects
- Building code
- 2024 International Building Code, 2024 International Residential Code, 2024 International Fire Code, 2024 International Existing Building Code, 2024 International Energy Conservation Code (building thermal envelope only), 2024 International Plumbing Code, 2024 International Fuel Gas Code, 2024 International Mechanical Code, 2023 NFPA 70 National Electrical Code, ICCA117.1-2009 Accessible and Usable Buildings and Facilities Code (with local amendments).
- Permit validity
- Permits remain valid for 180 days from issuance.
- Owner-builder
- Homeowners may obtain permits and work on their primary residence.
- Contractor requirements
- Contractors must hold a current City of Casper contractor license. Categories include General/Sub Contractors, Electrical Contractors, Plumbing/Mechanical/Individual Contractors, and Reciprocal Contractors. License renewal grace period ends March 31 of each year. Current Certificates of Insurance required for renewal.
Source: Building Inspection Division, Community Development Department ↗
§ 03
Application process
Typical processing: Contact (307) 235-8254 for processing time estimates.
- 01 Contact Planning/Zoning at (307) 235-8241 before submitting plans to confirm the project complies with City of Casper zoning regulations.
- 02 Register for an account on the CSS Portal.
- 03 Prepare required documents based on project type (residential interior remodel, residential exterior addition/garage, commercial, or specialized projects).
- 04 Submit permit application and all supporting documents through the CSS Portal or in person.
- 05 Staff reviews submission for code compliance.
- 06 Upon approval, permit is issued. The permit must be posted on-site before work begins.
- 07 Schedule required inspections through the CSS Portal or by phone during construction.
- 08 Pass all required inspections. Certificate of Occupancy issued after all final inspections are passed.
Typical processing time: Contact (307) 235-8254 for processing time estimates.
Source: Building Inspection Division, Community Development Department ↗
§ 04
Fee schedule
Casper building permit fees
Fee type
Amount
01
Permit fee formula
Valuation-based for building permits (materials and labor value of the proposed work). Electrical, plumbing, and mechanical permit fees are based on the size and number of items being installed.
Payment is accepted through the CSS Portal or in person.
Fees change periodically. Confirm at the official fee schedule ↗ before budgeting.
§ 05
Required inspections
Scheduling and sequence
How to schedule
- CSS Portal (online)
- (307) 235-8254 (phone)
- Inspection hours
- Monday-Friday, 8:00 AM to 5:00 PM
Typical sequence: Foundation/footing, framing rough-in, insulation, drywall (if required), mechanical/electrical/plumbing rough-in, final inspection. Commercial projects require additional life-safety inspections.
Source: Building Inspection Division, Community Development Department ↗
§ 06
Frequently asked
Common questions about Casper permits
01 Do I need a building permit in Casper, WY? ▸
Permits must be obtained before construction of a new building or addition, or the remodel, alteration, or repair of any existing structure within the City of Casper.
02 How much does a building permit cost in Casper, WY? ▸
Building permit fees in Casper, WY are set by the local building department and vary by project type and valuation. Fees are calculated as: Valuation-based for building permits (materials and labor value of the proposed work). Electrical, plumbing, and mechanical permit fees are based on the size and number of items being installed..
03 How do I apply for a building permit in Casper, WY? ▸
To apply for a building permit in Casper, WY, follow these steps: 1. Contact Planning/Zoning at (307) 235-8241 before submitting plans to confirm the project complies with City of Casper zoning regulations. 2. Register for an account on the CSS Portal. 3. Prepare required documents based on project type (residential interior remodel, residential exterior addition/garage, commercial, or specialized projects). 4. Submit permit application and all supporting documents through the CSS Portal or in person. 5. Staff reviews submission for code compliance. 6. Upon approval, permit is issued. The permit must be posted on-site before work begins. 7. Schedule required inspections through the CSS Portal or by phone during construction. 8. Pass all required inspections. Certificate of Occupancy issued after all final inspections are passed.
04 How long does it take to get a building permit in Casper, WY? ▸
Building permit processing times in Casper, WY typically run Contact (307) 235-8254 for processing time estimates.. Timelines can vary based on project complexity and current department workload.
05 What work is exempt from building permits in Casper, WY? ▸
Not all construction work requires a permit in Casper, WY. The following work is generally exempt: Single-story unheated detached storage structures under 120 square feet (a free Fence/Shed permit is still required); Fences not exceeding 6 feet in height (a free Fence/Shed permit is still required); Retaining walls under 4 feet high (specific conditions apply); Flatwork (walkways, driveways) not exceeding 30 inches above grade; Interior finishing work (painting, flooring, trim). Note: Even for exempt structures, the free Fence/Shed permit must be obtained. When in doubt, confirm with the local building department before starting work.
06 How do I schedule a building inspection in Casper, WY? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in Casper, WY via: CSS Portal, (307) 235-8254.
last verified April 2026
source Building Inspection Division, Community Development Department ↗
entry id permits/wyoming/natrona/casper
Educational reference. Permit rules and fees change — confirm current requirements directly with Building Inspection Division, Community Development Department before applying. Jaspector is not legal advice.