Building permits, zoning and rural land rules across Wyoming

Wyoming has 9 counties without a residential building-permit requirement, 5 with a limited requirement and 9 that require one^1,2. These counts concern unincorporated land; county zoning authority does not replace an incorporated city's or town's zoning authority¹¹.

Counties without the residential building-permit requirement include Crook County, Fremont County, Johnson County, Hot Springs County, Weston County, Converse County, Washakie County, Niobrara County¹. Use the no-building-codes county list to compare locations, while keeping building permits and code enforcement separate¹. Wyoming has adopted the 2024 International Building Code, but state fire-marshal plan review covers specified building categories rather than establishing a universal county residential permit requirement¹². Owner-building does not automatically waive building permits: Wyoming leaves general-contractor licensing to local jurisdictions, with electrical licensing treated separately⁹.

Wyoming has 9 counties without countywide zoning and 14 with zoning^2,3. The first counties without countywide zoning are Crook County, Fremont County, Johnson County, Big Horn County, Weston County, Converse County, Washakie County, Campbell County³. The no-zoning county list provides the full comparison³.

The overlap matters: 7 counties have both no residential building-permit requirement and no countywide zoning, including Crook County, Fremont County, Johnson County, Weston County, Converse County, Washakie County, Goshen County⁷. See the combined county list when both conditions matter to your search⁷. Lack of countywide zoning does not remove Wyoming's septic authorization or subdivision framework; regulated land divisions still require county subdivision approval before sale, plat recording or subdivision construction^8,11.

Wyoming requires a septic permit for installation, repair or replacement of septic tanks and leach fields⁸. The county authority pattern lists 17 counties with county offices, 2 served by a multi-county district and 4 with state-agency permitting². DEQ identifies its small-wastewater jurisdiction as Carbon, Niobrara, Platte and Weston counties, plus commercial systems in Campbell County; other jurisdictions may use different forms or require additional information⁴.

For a DEQ-jurisdiction system treating less than 2,000 gallons of domestic sewage daily, use the Small Wastewater Facility General Permit process and submit the application and leachfield design to the appropriate District Engineer⁴. Wait for construction authorization, then submit the Certificate of Completion after installation⁴. A composting or incinerating toilet may also require authorization, so ask DEQ about your proposed sanitation design before treating an off-grid toilet as a septic-permit exemption⁸.

The highest Bolthole Index scores belong to Crook County, Fremont County, Sheridan County, Albany County, Johnson County, Lincoln County, Big Horn County, Park County². Crook County scores 72 out of 100 and combines no residential building-permit requirement with no countywide zoning; Fremont County scores 68 and has the same permit and zoning answers². Sheridan County also scores 68, but requires a building permit and has zoning, while Albany County scores 67 with limited building-permit requirements and zoning².

Wyoming's median county farmland value is $1,330 per acre; Sweetwater County has the lowest listed value at $387 per acre². These are farmland values, so use them as county comparisons rather than a quote for a residential parcel². The median county effective property-tax rate is 0.6%, and the median county property-tax bill is $1,465 annually². Even in the counties with fewer building and zoning requirements, budget for septic authorization and State Engineer well approval^8,13.

Wyoming requires an approved State Engineer groundwater permit before well construction or related work begins¹³. Domestic and stock applications carry a $50 filing fee, and wells and pumps require Wyoming-licensed drilling and pump-installation contractors¹⁰. Submit the Application for Permit to Appropriate Ground Water and wait for approval before arranging drilling¹³.

Special groundwater management regimes cover areas in Laramie County, Platte County and Goshen County; ask the Ground Water Division whether the parcel falls inside the applicable control area¹⁴. For a driveway onto WYDOT right-of-way, submit the access-driveway application to the local WYDOT Maintenance Foreman for district review¹⁵. Large-parcel subdivision provisions also matter: the general exemption for parcels of 35 acres or more is subject to statutory exceptions and recorded access and utility easements at least 40 feet wide unless properly waived¹¹.