Do I need a permit for a basement finish in Natrona County?

Yes. 'Basement Finish' is a listed project type on the county's Building, Electrical, Plumbing, and Mechanical permit applications. You need a building permit for the finish work and separate trade permits for any electrical, plumbing, or mechanical work involved.

Residential Addition / Remodel Permit in Unincorporated Natrona County, Wyoming

Verified

Required for additions, remodels, basement finishes, and repairs to existing one- and two-family dwellings in unincorporated Natrona County. Uses the same combined Building Permit Application as new construction (select 'Remodel,' 'Addition,' or 'Repair' as Type of Work).

Verified 2026-07-01 · Source

$70 (valuation $0–$2,500) up to $905 plus $9.24 per additional $1,000 over $98,000Building Permit Fee — valuation-based (same table as new construction)

When you need this permit

Same Building Permit Application form as new construction; select Type of Work: Remodel, Addition, or Repair
Declare whether work has already commenced (application asks 'Has work commenced on this project? Yes/No')
Existing and proposed bedroom/bathroom counts must be listed for additions/remodels affecting habitable space
Job valuation must be declared — fee is set by the same valuation-based table used for new construction
Licensed, currently-insured Natrona County contractor required unless the property owner is performing the work themselves

Required documents

Req
Natrona County Building Permit Application (Residential or Commercial, 2025 form)
Same combined application form used for all building permit work types
Req
Site Plan Application (2025)
Required for additions that change the building footprint or setbacks

Fee schedule

Fee type	Amount	Notes
Building Permit Fee — valuation-based (same table as new construction)	$70 (valuation $0–$2,500) up to $905 plus $9.24 per additional $1,000 over $98,000	Natrona County Permit Fees, Resolution No. 45-20 — remodels/additions/repairs use the identical valuation-based schedule as new construction; no separate remodel fee line exists.
Compliance Inspection (if construction started without a permit)	$150 residential / $300 commercial	Resolution No. 45-20; also see Compliance Inspection Application form

Review timeline

~3–10 business days

Typical estimate — confirm current times with the Unincorporated Natrona County building department

Inspection process

1
Footing / Foundation (if new footings added)
Before concrete pour, for additions with new foundation work
2
Framing
After framing complete, before insulation or wall cover
3
MEP Rough-In
Electrical, plumbing, mechanical rough-in before walls closed (separate trade permits required)
4
Final
All work complete per approved plans

Tips

Basement finishes are explicitly listed as a 'Nature of Project' option on the county's building, electrical, plumbing, and mechanical permit applications — a basement finish involving any trade work needs the corresponding trade permit(s) in addition to the building permit.
If construction already commenced before a permit was obtained, expect a Compliance Inspection ($150 residential/$300 commercial) in addition to the standard (tripled) permit fee.

Frequently asked questions

Do I need a permit for a basement finish in Natrona County?: Yes. 'Basement Finish' is a listed project type on the county's Building, Electrical, Plumbing, and Mechanical permit applications. You need a building permit for the finish work and separate trade permits for any electrical, plumbing, or mechanical work involved.

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.

Other permits in Unincorporated Natrona County

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 Deck Permit

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