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Residential Addition / Remodel Permit in Casper, Wyoming

Required for additions, remodels, and alterations to existing one- and two-family dwellings in Casper, including decks, patio covers, detached garages, and basement finishes when they involve framing, electrical, plumbing, or mechanical work. Governed by the 2024 IRC.

Verified 2026-07-16 · Source

When you need this permit

  • All exterior work such as decks, additions, or accessory structures requires a plot plan and construction drawings
  • Construction drawings typically include foundation design, room sizes, window locations and sizes
  • Fee based on the value (materials and labor) of the work per the combined valuation fee schedule
  • Permit valid for 180 days from issuance
  • Building Guides available from Community Development for: one-story additions, basement finish, patio covers/carports, detached garages, decks, ramps, pole barns, monolithic slabs

Required documents

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Fee schedule

Initial Building Permit FeeCity of Casper Permit Fee Schedule (eff. February 2, 2026)
$35
Combined Building/Electrical/Plumbing/Mechanical Permit Fee — valuation-basedCity of Casper Permit Fee Schedule (eff. February 2, 2026) — same combined table used for new construction; valuation is based on the cost of the addition/remodel work
Graduated table from $70 (valuation $1–$1,000) up to $841 (valuation $99,001–$100,000); over $100,000 = $806 + $5.60 per additional $1,000 or fraction thereof
After-the-fact permit surcharge
Double the building permit fee

Review timeline

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

How long did your Residential Addition / Remodel Permit permit actually take in Casper?

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

Inspection process

  1. 1

    Footer/Foundation (if new footings)

    Before concrete pour, for additions requiring new foundation elements

  2. 2

    Framing

    After framing complete and MEP rough-ins installed and inspected

  3. 3

    Insulation

    Proper R-values and placement before drywall

  4. 4

    Drywall

    Thickness/type and screw placement

  5. 5

    Final

    All work complete per approved plans

See the full Casper inspection guide — scheduling & re-inspection fees →

Tips

  • Decks, patio covers, detached garages, and basement finishes are all processed as valuation-based permits under Casper's combined fee table — there is no separate flat-rate schedule for these scope types as there is in some other cities.
  • Ask Community Development for the relevant Building Guide (decks, basement finish, patio covers/carports, detached garages) before submitting plans — these guides summarize the code and design requirements for the most common owner projects.
  • A conditional use permit from the Planning and Zoning Commission is required for detached garages/accessory buildings exceeding 12 ft in exterior wall height.

Frequently asked questions

Yes, a basement finish involving framing, electrical, plumbing, or mechanical work requires a building permit, reviewed under the 2024 IRC. A Building Guide for basement finishes is available from Community Development at (307) 235-8254.

In Casper, the published Initial Building Permit Fee is: $35. Additional published fees: Combined Building/Electrical/Plumbing/Mechanical Permit Fee — valuation-based — Graduated table from $70 (valuation $1–$1,000) up to $841 (valuation $99,001–$100,000); over $100,000 = $806 + $5.60 per additional $1,000 or fraction thereof; After-the-fact permit surcharge — Double the building permit fee. 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 Casper typically runs 5–20 business days. This is an estimate, not a published figure — confirm current review times with City of Casper Community Development Department — Building Inspection Division at (307) 235-8254.

You'll need: Building Permit Application; Residential Building Permit Checklist; Plot Plan; Construction Drawings. See the required-documents checklist on this page for details on each.

Casper requires 5 inspection(s) for a residential addition / remodel permit, in order: Footer/Foundation (if new footings), Framing, Insulation, Drywall, Final. Schedule each through City of Casper Community Development Department — Building Inspection Division ((307) 235-8254).

Apply through City of Casper Community Development Department — Building Inspection Division at 200 N David St, Casper, WY 82601. Phone: (307) 235-8254, email: building@casperwy.gov. Office hours: Mon–Fri 8:00 AM–5:00 PM (in-person/phone code consultation available 8:00–9:00 AM and 4:00–5:00 PM). Official information: https://www.casperwy.gov/services/building_and_inspections/index.php.

Casper, Wyoming has adopted: 2024 International Building Code (IBC); 2024 International Residential Code (IRC); 2024 International Fire Code (IFC); 2024 International Existing Building Code (IEBC); 2024 International Energy Conservation Code (IECC) — applies to the building thermal envelope ONLY per City of Casper adoption note; 2024 International Plumbing Code (IPC); 2024 International Fuel Gas Code (IFGC); 2024 International Mechanical Code (IMC); 2023 NFPA 70 National Electrical Code (NEC); ICC A117.1-2009 Accessible and Usable Buildings and Facilities. Local amendments apply — see the Casper overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-07-16.

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 Casper 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

Cheyenne, WyomingEvanston, WyomingGillette, WyomingGreen River, WyomingJackson, WyomingLaramie, WyomingRiverton, WyomingRock Springs, Wyoming

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