Floodplain Development Permit in Unincorporated Fremont County, Wyoming

Unincorporated Fremont County requires a floodplain development permit for: Required if the property lies within a mapped flood hazard area per the Fremont County Mapserver 'Flood Hazard Zones' layer; Construction is restricted in all zones with a 0.1% annual chance of flooding (the 100-year floodplain); Construction is forbidden entirely within the mapped Floodway; Complete and submit an Application for Floodplain Development through the Planning Department before any excavation or construction begins; An Elevation Certificate or Floodproofing Certificate may be required depending on the scope; A Floodplain Zoning Regulation Variance may be requested for exceptions. If your project isn't listed, confirm with Fremont County Planning Department at (307) 332-1077 before starting work.

In Unincorporated Fremont County, the published Floodplain Development Permit is: $750.00. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for a floodplain development permit in Unincorporated Fremont County typically runs 1–30 business days. This is an estimate, not a published figure — confirm current review times with Fremont County Planning Department at (307) 332-1077.

You'll need: Floodplain Development Permit Application; Floodplain Application Information. Depending on your project, Unincorporated Fremont County may also ask for: Elevation Certificate; Floodproofing Certificate. See the required-documents checklist on this page for details on each.

Unincorporated Fremont County requires 1 inspection(s) for a floodplain development permit, in order: Floodplain Compliance Review. Schedule each through Fremont County Planning Department ((307) 332-1077).

Apply through Fremont County Planning Department at 450 North 2nd Street, Lander, WY 82520. Phone: (307) 332-1077, email: support@fremontcountywy.gov. Office hours: Mon–Fri (contact department for current hours). Official information: https://fremontcountywy.gov/government/departments/planning_department/building_codes.php.

Unincorporated Fremont County, Wyoming has adopted: NO county-wide building code and NO county-specific building permit for private construction. Fremont County's own Planning Department page states verbatim: 'Fremont County does not have any County-wide Zoning or County specific Building Codes, except the following' (small wastewater/septic permits and floodplain zoning in mapped FEMA hazard areas near Lander, Riverton, Dubois, and Hudson) — https://fremontcountywy.gov/government/departments/planning_department/building_codes.php; Confirmed against the Wyoming Dept. of Fire Prevention & Electrical Safety 'LOCAL AND STATE JURISDICTIONS' chart (updated 7/7/2026 as of this check — the date label itself changed from a prior 5/11/2026, but the underlying Fremont County determination did not — embedded at wsfm.wyo.gov/electrical-safety): Fremont County's BLDG INSP/PR and ELEC INSP/PR columns are both still marked S/S (state) for the unincorporated county, meaning the county has NOT taken general building-code delegation under W.S. § 35-9-121 — the State of Wyoming, not Fremont County, has building jurisdiction over unincorporated private construction; Fremont County's own building-codes page RECOMMENDS (does not require) that residents follow the State of Wyoming's adopted codes for new construction: 2024 International Building Code, 2024 International Existing Building Code, 2024 International Mechanical Code, 2024 International Fire Code, 2024 International Fuel Gas Code, and the National Electrical Code (2023 edition was in effect through June 30, 2026; per wsfm.wyo.gov/electrical-safety, the 2026 NEC edition took effect statewide July 1, 2026) — these are recommendations for quality/insurability, not a locally enforced code, and the county issues no building permit and performs no building inspection against them; Fremont County explicitly states it does NOT issue Certificates of Occupancy; Commercial/public construction is NOT fully unregulated: per Wyoming Statute § 35-9-108, a State Fire Marshal plan review IS required for government/school buildings, buildings over 5,000 sq ft with public access, childcare centers (10+ children), multi-story buildings, places of assembly, fire-protection-system work, alternative energy installations (solar/wind/generator), aboveground flammable/combustible liquid storage tanks, Type I commercial kitchen hoods, spray finish applications, and RV/camping/mobile-home park site plans — contact the State Fire Marshal's Plan Review office (Jeff Schoen, (307) 673-1461, jeff.schoen@wyo.gov) for any of these commercial scopes; The Incorporated Cities within Fremont County (Riverton, Lander, Dubois, Hudson, Shoshoni, Pavillion, and South Pass City) each have their OWN separate zoning and building codes and issue their own permits — this LEAN page covers ONLY unincorporated (outside city-limits) Fremont County. See the separate City of Riverton page for Riverton's own building department.. Local amendments apply — see the Unincorporated Fremont County overview page for the full list.

No general county building permit exists — Fremont County has no county-wide building code (confirmed on the county's own Building Codes & Certificates of Occupancy page). The county's only development-permit trigger is if your property lies within a FEMA-mapped flood hazard area, in which case a Floodplain Development Permit ($750) is required before construction.