Unincorporated Sweetwater County building permits
VerifiedDepartment contacts, adopted codes, permit types, fees, and gotchas for Unincorporated Sweetwater County, Wyoming.
Last verified 2026-07-01 · Source
Building department
- Address
- 80 W. Flaming Gorge Way, Suite 23, Green River, WY 82935
- Phone
- (307) 872-3914
- Office hours
- Monday - Friday, 8:00 am - 5:00 pm
- Website
- Official site
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.
Permit types & fees
Zoning/Construction Permit (Land Use) — not a building-code permit
Sweetwater County does not issue a code-enforcement building permit for private construction. Instead, the county's Land Use Department requires an approved ZONING permit before any residential, commercial, industrial, or mineral construction/use begins in the unincorporated county — most projects use the 'Construction' application (which also covers oil & gas well permitting). This is a land-use/zoning approval, not an IBC/IRC building-code plan review or inspection program.
Septic / Small Wastewater System Permit
New or replacement septic (onsite wastewater) systems in unincorporated Sweetwater County are permitted through the Sweetwater County District Board of Health's Environmental Health division, not the Land Use building/zoning office. Approval of septic applications is by appointment only.
County Access / Driveway Permit (Public Works — Engineering)
New road access onto a county road, or any work/activity within a county road right-of-way not covered by a utility license, requires a County Access Permit from the Public Works Department's Engineering division. Utility lines crossing or paralleling a county road use a separate County Utility License (Type A for buried lines, Type B for overhead/short-parallel lines).
Electrical Wiring Permit (State Program)
Sweetwater County has not taken delegated electrical-enforcement authority, so electrical wiring permits in unincorporated Sweetwater County (including Green River, per the WSFM chart) are issued by the Wyoming State Fire Marshal's Office — Dept. of Fire Prevention & Electrical Safety (Chief Electrical Inspector) under the 2023 NEC, not by the county.
Tips & gotchas
- There is no county building permit (no IBC/IRC code-enforcement plan review or inspection program) for private construction in unincorporated Sweetwater County — confirmed on the county's own Land Use Department page and Development Codes list, and corroborated by the Wyoming State Fire Marshal's jurisdiction chart (county BLDG INSP/PR = state).
- You still need the county's zoning 'Construction' permit from the Land Use Department before building — it is a zoning/land-use approval, not a building code permit, but skipping it triggers a Late Application Fee.
- Floodplain: no dedicated stand-alone floodplain development permit was found on the county's site separate from the zoning/construction review; floodplain considerations for a specific parcel should be confirmed directly with the Land Use Office (307-872-3914) as part of the zoning/construction application.
- Septic/onsite wastewater systems require a separate permit through the District Board of Health's Environmental Health division (by appointment only) — this is a different office than Land Use.
- New driveway/road access onto a county road requires a County Access Permit from Public Works — Engineering; utility line crossings of county roads use separate County License Type A (buried) or Type B (overhead/short) forms.
- Electrical wiring permits are issued by the Wyoming State Fire Marshal's electrical program (2023 NEC), not the county — confirmed by both the WSFM jurisdiction chart and the county's own referral link.
- Read the county's 'Red Desert Info' packet before purchasing property in the Red Desert area — the Land Use Department flags special development requirements there.
- Rock Springs and Green River are incorporated cities within Sweetwater County with their OWN city building departments — this LEAN page covers only the unincorporated county; do not apply this 'no building permit' answer to property inside city limits.