Unincorporated Natrona County building permits
VerifiedDepartment contacts, adopted codes, permit types, fees, and gotchas for Unincorporated Natrona County, Wyoming.
Last verified 2026-07-01 · Source · Embed this page’s badge · Version history
Building department
- Address
- 200 N. Center St, Room 205, Casper, WY 82601
- Phone
- (307) 235-9435
- Office hours
- Monday–Friday, 8:00 AM–5:00 PM
- Website
- Official site
Inspection guide
See how inspections work in Unincorporated Natrona County — sequence, scheduling & re-inspection fees.
Codes adopted
Wyoming has no statewide-mandated building code for general private construction. Under Wyoming Statute § 35-9-106, the Council on Fire Prevention and Electrical Safety in Buildings adopts minimum fire, building, mechanical, existing-building, and fuel-gas standards (not exceeding the International Codes), but § 35-9-121 makes local enforcement an opt-in delegation: a municipality or county must apply to the State Fire Marshal for local enforcement authority and adopt, by ordinance or resolution, standards equivalent to or more stringent than the state's — otherwise no local building code applies at all. In practice this produces exactly the fragmented picture that describes most of the state: some cities and counties (e.g., Laramie County, Natrona County) have adopted and enforce their own building codes, while many unincorporated county areas genuinely require no building permit for general construction. Electrical is different: under § 35-9-119(a)(i), the Chief Electrical Inspector (Wyoming State Fire Marshal's Office, Department of Fire Prevention and Electrical Safety) enforces the National Electrical Code statewide by default, EXCEPT in localities that have been separately granted their own certified electrical-enforcement authority under § 35-9-121(a) — so electrical permitting may be issued by the state program or by the local jurisdiction depending on which one currently holds delegated authority. Always confirm both the current building-code adoption status (if any) and which entity — state or local — issues the electrical permit with the specific jurisdiction before submitting plans.
- 2024 International Building Code (IBC) — adopted by Resolution 84-24
- 2024 International Residential Code (IRC) — adopted by Resolution 90-24
- 2024 International Existing Building Code (IEBC) — adopted by Resolution 85-24
- 2024 International Fire Code (IFC) — adopted by Resolution 86-24
- 2024 International Fuel Gas Code (IFGC) — adopted by Resolution 87-24
- 2024 International Mechanical Code (IMC) — adopted by Resolution 88-24
- 2024 International Plumbing Code (IPC) — adopted by Resolution 89-24
- 2023 National Electrical Code (NEC / NFPA 70) — adopted by county resolution
Permit types & fees
Residential Building Permit (New Construction)
Required for new single-family dwellings and other new one- and two-family residential construction in unincorporated Natrona County. Reviewed under the 2024 IRC as adopted by the Natrona County Building Department (Resolution 90-24).
Residential Addition / Remodel Permit
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).
Electrical Permit
Required for electrical installations, service changes, and repairs in unincorporated Natrona County. Natrona County holds LOCAL delegated electrical enforcement authority (BLDG L/L, ELEC L/L per the WY State Fire Marshal jurisdictions chart) — the county's OWN Building Department issues and inspects electrical permits under the adopted 2023 NEC; this is NOT the WY State Fire Marshal's default statewide electrical program.
Plumbing Permit
Required for plumbing installations, gas line work, and septic-connected plumbing in unincorporated Natrona County. Governed by the 2024 International Plumbing Code (IPC) as adopted by Resolution 89-24, and the 2024 International Fuel Gas Code for gas piping.
Mechanical / HVAC Permit
Required for heating, cooling, and fuel-gas appliance installations in unincorporated Natrona County. Governed by the 2024 International Mechanical Code (IMC, Resolution 88-24) and 2024 International Fuel Gas Code (IFGC, Resolution 87-24).
Roofing Permit (Reroof)
Required for roof replacement (tear-off and reroof) on residential and commercial buildings in unincorporated Natrona County. The Building Department does not perform underlayment/decking inspections — the owner/contractor must photo-document decking and underlayment before requesting final inspection.
Solar PV Permit
Required for rooftop or ground-mounted residential/accessory solar photovoltaic (PV) installations in unincorporated Natrona County. Classified in the Natrona Next Zoning Resolution as a 'Solar Generator, Accessory' (Section 4.10.13) — a use PERMITTED (P) by-right in every zoning district in the county. The electrical interconnection portion is processed on the county's standard Electrical Permit Application ('Solar/PV Installation' is a listed Nature of Project option).
Accessory Dwelling Unit (ADU) Permit
Required for construction of an ADU on a residential property in unincorporated Natrona County. ADUs are expressly defined and regulated as a Permitted (P) accessory use in the Urban Agricultural (UA), Mountain Residential 1 & 2 (MR-1/MR-2), Suburban Residential (SR), Rural Residential (RR), and Urban Residential (UR) zoning districts under the Natrona Next Zoning Resolution § 4.11.05(A). Built under the standard county Building Permit process once zoning standards are confirmed with Planning.
Demolition Permit
Required for demolition of structures in unincorporated Natrona County. Uses the standard Building Permit Application process; charged a dedicated flat demolition fee (distinct from the general valuation table) per the county's adopted fee resolution.
Commercial Tenant Improvement Permit
Required for interior alterations, remodels, or repairs to existing commercial/industrial buildings in unincorporated Natrona County. Uses the same combined Building Permit Application (select Building Use: Commercial; Type of Work: Remodel or Repair), reviewed under the 2024 IBC and IEBC as adopted.
Deck Permit
Required for construction of a new deck attached to a residential dwelling in unincorporated Natrona County. Processed under the standard Building Permit Application (Type of Work: Addition) and reviewed under the 2024 IRC; must comply with the accessory/principal structure setbacks of the applicable zoning district.
EV Charger / EVSE Permit
Natrona County does not publish a distinct EV charger/EVSE fee line. Installing electric vehicle charging equipment requires a standard Electrical Permit from the Natrona County Building Department under the adopted 2023 NEC (which includes Article 625, Electric Vehicle Power Transfer System), billed under the same combined valuation-based fee table used for all electrical, building, plumbing, and mechanical permits (Resolution No. 45-20) — there is no separate flat electrical-permit fee. Work must be performed by, or under, a Natrona County-licensed Electrical Contractor, Master, Journeyman, or Apprentice electrician, since the county runs its own local electrical licensing program rather than using the Wyoming State Fire Marshal's statewide program.
Sign Permit
Required for installation, replacement, or alteration of any building or freestanding sign in unincorporated Natrona County, unless specifically exempted. Reviewed jointly: the Natrona County Building Department processes the physical Sign Permit application (form-based, same combined valuation-based fee table as other trade permits), while the Natrona County Planning Department separately certifies zoning compliance under Zoning Resolution § 5.13 Sign Permit, applying the sign standards of § 3.08 Signs (size, height, setback, and district-based cumulative area limits).
Fire Alarm System Permit
Construction permit required from the Natrona County Fire Protection District (NCFPD) Office of the Fire Marshal before installing or modifying a fire alarm system in unincorporated Natrona County, under the adopted 2024 International Fire Code § 105.6 and NFPA 72 (2025 edition). Processed separately from the county Building Department's building/electrical permits, through the district's own NCFPDpermits.com web portal.
Fire Sprinkler System Permit
Construction permit required from the Natrona County Fire Protection District (NCFPD) Office of the Fire Marshal before installing or modifying a fire sprinkler system in unincorporated Natrona County, under the adopted 2024 International Fire Code § 105.6 and NFPA 13/13R/13D (2025 edition). Processed separately from the county Building Department's building/plumbing permits, through the district's own NCFPDpermits.com web portal.
Change of Use / Zoning Certificate & Certificate of Occupancy
Natrona County does not issue a standalone 'change of use permit' product; a change of use of any building or land area is regulated through the Zoning Certificate process (Zoning Resolution § 5.12), administered by the Natrona County Planning Department, and closed out with a Certificate of Occupancy (C.O.) issued by the Building Department once the Building Official finds the completed work free of code violations.
New residential construction activity
New privately-owned residential construction onlyHousing units authorized by building permits for new privately-owned residential construction — this is not total permit volume (no commercial permits or remodels).
- Latest month (2026-05)
- 11units
11 buildings · $3.6M valuation
- Trailing 12 months
- 156units
12 of 12 months reported · #5 in Wyoming coverage by units
- Year to date (2026 YTD through 2026-05)
- 53units
52 buildings · $20.5M valuation
- Full year 2025
- 199units
198 buildings · $54.5M valuation
County-wide figures: BPS reports county-wide totals; jurisdiction is the unincorporated remainder — county totals include incorporated cities; county file row: 'Natrona County' (co2605c.txt, 56/025); place file also carries 'Natrona County Unincorporated Area' (place code 99990) as a possible Phase-1 alternative
Source: U.S. Census Bureau, Building Permits Survey (BPS), 2026-05 vintage. Census survey data — separate from the permit-requirements verification above. All Wyoming building activity
Tips & gotchas
- Natrona County uses ONE combined, valuation-based fee table (Resolution No. 45-20, effective Jan 2024) for building, electrical, plumbing, mechanical, and roofing permits — there is no per-trade flat fee. Demolition is the one type with its own dedicated flat fee ($75 residential/$150 commercial).
- This is a FULL-authority county: Natrona County holds its OWN delegated building AND electrical enforcement authority under W.S. § 35-9-121 (confirmed BLDG L/L, ELEC L/L on the WY State Fire Marshal jurisdictions chart) — unlike many other unincorporated WY counties (Albany, Sweetwater, Sheridan, Uinta, Fremont) where the state handles building/electrical, Natrona County runs its own program end-to-end, including its own contractor licensing.
- This unincorporated-county page is separate from the City of Casper (the county seat), which has its own independent municipal Building Inspection Division. Confirm your parcel is OUTSIDE Casper city limits before using this county process.
- All contractors (general, electrical, plumbing, mechanical, roofing, demolition, mobile home, gas utility, utility) must hold a current Natrona County contractor license — licenses expire December 31 annually and permits will not be approved with an expired license or insurance.
- Work started without an approved permit triples the standard permit fee (emergencies are exempt) and may trigger a Compliance Inspection ($150 residential/$300 commercial).
- Applications can be submitted online via ViewPointCloud (natronacountywy.viewpointcloud.com) or via paper forms (Building, Electrical, Plumbing, Mechanical, Roofing, Mobile Home, Site Plan, Address Request) posted on the county's Applications page.
- ADUs are permitted by-right in the UA, MR-1, MR-2, SR, RR, and UR zoning districts (Zoning Resolution § 4.11.05(A)), subject to owner-occupancy of the primary dwelling, a size cap of the smaller of 50% of the primary home or 1,000 sq ft, and a height cap matching the primary dwelling.
- Accessory solar generators (rooftop or ground-mounted, non-commercial) are a Permitted (by-right) use in every zoning district in the county (§ 4.10.13) — no special zoning approval needed for a typical residential rooftop system, only the standard electrical permit.
- The Building Department explicitly does NOT perform underlayment/decking inspections for reroofs — owners/contractors must submit their own photo documentation before requesting the final roofing inspection.
- Natrona County Building Department address: 200 N. Center St, Room 205, Casper, WY 82601 — phone 307-235-9435, hours Monday–Friday 8am–5pm. General county switchboard: 307-235-9200.