Do I need a permit to build a deck in Casper?

Yes, decks require a building permit in Casper unless the deck qualifies as flatwork (landing/walkway not more than 30 inches above grade and not over a basement). Fees are valuation-based per the City's combined fee schedule. A Building Guide for residential decks is available from Community Development.

Is a permit required to finish a basement in Casper?

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.

Residential Addition / Remodel Permit in Casper, Wyoming

Verified

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 2026-07-01 · Source

$35Initial Building Permit Fee

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

Req
Building Permit Application
Submitted via CSS Portal or in person; select addition/remodel scope
Req
Residential Building Permit Checklist
City of Casper's submittal checklist
Req
Plot Plan
Site plan showing lot lines, setbacks, existing structures, and proposed addition footprint
Req
Construction Drawings
Plans showing framing, dimensions, and connection to existing structure; MEP details as applicable

Fee schedule

Fee type	Amount	Notes
Initial Building Permit Fee	$35	City of Casper Permit Fee Schedule (eff. February 2, 2026)
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	City 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
After-the-fact permit surcharge	Double the building permit fee	—

Review timeline

~5–20 business days

Typical estimate — confirm current times with the Casper building department

Inspection process

1
Footer/Foundation (if new footings)
Before concrete pour, for additions requiring new foundation elements
2
Framing
After framing complete and MEP rough-ins installed and inspected
3
Insulation
Proper R-values and placement before drywall
4
Drywall
Thickness/type and screw placement
5
Final
All work complete per approved plans

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

Do I need a permit to build a deck in Casper?: Yes, decks require a building permit in Casper unless the deck qualifies as flatwork (landing/walkway not more than 30 inches above grade and not over a basement). Fees are valuation-based per the City's combined fee schedule. A Building Guide for residential decks is available from Community Development.
Is a permit required to finish a basement in Casper?: 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.

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 Casper building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

Other permits in Casper

Residential Building Permit (New Construction)Electrical Permit Plumbing Permit Mechanical / HVAC Permit Roofing Permit (Reroof)Solar PV Permit Accessory Dwelling Unit (ADU) Permit Demolition Permit Commercial Tenant Improvement Permit Basement Finish Permit Deck Permit

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