Building permits, zoning and land rules in Hot Springs County, Wyoming

Unincorporated Hot Springs County does not administer a general residential building permit¹. Treat that answer narrowly: Hot Springs County directs anyone proposing new construction to contact the Planning Office first to determine which county and state rules apply². The office reviews development and land divisions on private land and supplies applications for land-use changes and related requests, so land-development approval may still apply². Wyoming has adopted statewide fire and building safety codes, including the International Building Code, for work under state authority⁸. We could not confirm that Hot Springs County has adopted a county building code, conducts general building inspections, or issues certificates of occupancy. An owner may act as general contractor on a primary residence, although local approvals and Wyoming electrical requirements still apply⁵.

The Hot Springs County Planning Office is the first stop for rural construction, land-use requests, property addressing, subdivisions, statutory exemptions, and residential septic permits². Call 307-864-2961 or visit 415 Arapahoe, Thermopolis, Wyoming, before construction or land division begins². Applications for land-use changes, subdivisions, and related requests come from the Planning Office, which also reviews and approves residential septic applications and permits². The Planning Office coordinates county fire numbers for rural parcels². For land on a county road, Hot Springs County Road & Bridge maintains county roads and can answer road questions at 307-864-3497 or 740 Springview, Thermopolis, Wyoming⁹. A county driveway-permit rule could not be confirmed, so describe the proposed entrance and road when you call.

Hot Springs County has land-use regulations covering its unincorporated area that operate similarly to zoning but are not classic Euclidean zoning³. The county uses agricultural, residential, commercial, industrial, institutional, and airport land-use categories, and some commercial uses have parking requirements³. Numeric setbacks, minimum lot size, lot coverage, building height, and minimum dwelling size could not be confirmed. Ask the Planning Office for the parcel's category and a parcel-specific determination before relying on a seller's description of land as unrestricted². Incorporated towns may apply their own rules because Wyoming county zoning authority applies to unincorporated land and cannot override municipal zoning authority¹⁰.

A permit is required for a residential septic system in Hot Springs County, and construction may not begin before the permitting authority issues authorization⁴. The Hot Springs County Planning Office reviews and approves residential septic applications and permits². Site conditions deserve early attention because only 15.1% of Hot Springs County soils are rated without severe limitations for a conventional septic drain field⁷. That countywide rating does not decide whether an individual parcel will work, so take the parcel location and proposed home details to the Planning Office before settling on a house site². The county's inspection stages and current septic fee could not be confirmed; ask the Planning Office about both when requesting the application.

We could not confirm a Hot Springs County rule that expressly allows or prohibits long-term RV occupancy, temporary camping, or tiny-home occupancy on private rural land. Hot Springs County has land-use regulations in its unincorporated area, and the Planning Office identifies which county and state rules apply to proposed development^2,3. Tell the Planning Office whether the unit will be on wheels or a foundation, whether it will be occupied during construction, and how wastewater will be handled². A tiny home using a residential septic system needs county approval before septic construction begins^2,4. The absence of a confirmed occupancy rule is not permission; obtain a parcel-specific answer before buying land or moving a unit onsite.

1. Call the Hot Springs County Planning Office at 307-864-2961 with the parcel number and project description; the county directs people proposing new construction to contact the office first².

1. Confirm the parcel's land-use category and obtain any land-use application the Planning Office says applies^2,3.

1. Obtain a county fire number if the property needs an address; the Planning Office coordinates those numbers².

1. Apply through the Planning Office for residential septic approval before construction begins^2,4.

1. Obtain an approved Wyoming groundwater permit before well drilling or qualifying spring development; domestic and stock filing fees are $50⁶.

1. If the project divides land, start with the Planning Office: it reviews private land divisions, while the state identifies the county as reviewer for 1 to 5 lots and directs applicants to verify the criteria^2,11. A subdivision application must include a county-set fee that cannot exceed processing cost¹⁰.

Start with wastewater: only 15.1% of county soils are rated without severe limits for a conventional drain field, so confirm a workable septic location before choosing the building site⁷. Secure water next because Hot Springs County averages 13.3 inches of precipitation a year, and Wyoming requires an approved permit before drilling a groundwater well^6,7. Confirm legal access and recorded easements; Wyoming's large-parcel subdivision rule generally exempts parcels of at least 35 acres but requires recordable access and utility easements at least 40 feet wide unless properly waived¹². Ask the Planning Office about the parcel's land-use category, address status, subdivision history, required applications, and the current fee before dividing land^2,3,10. Floodplain permit applicability could not be confirmed for Hot Springs County, so ask the Planning Office about mapped flood hazards before placing a home. Property taxes average about 0.6%, with a median annual bill near $1,202⁷.