Building permits, zoning and land rules in Power County, Idaho

Unincorporated Power County requires building permits before site preparation, construction, alteration and other covered work; the county also lists re-roofing, re-siding, manufactured-home placement and outbuildings over 120 square feet^1,2. Power County adopts the 2018 International Building, Residential, Energy Conservation, Fire and Existing Building codes, with county amendments¹⁵. Separate Idaho electrical, plumbing or HVAC permits apply to covered trade work¹⁶. Building-permit fees are valuation-based, and plan review may cost up to 65 percent of the building-permit fee¹⁷. County construction requires six inspections before the next construction stage begins^10,18. A certificate of occupancy is required before a regulated building or use is occupied; a temporary certificate for weather-delayed improvements may last no more than 180 days^19,20.

Power County Building Administrator / Planning and Zoning handles county building-permit and land-use questions at 73 Fort Hall Ave. Ste. A American Falls, ID 83211, phone 208-226-7625². Submit complete blueprints 10 to 14 days before building, with a site plan showing property lines, structures, septic and wells, driveway access, easements and natural features; incomplete applications are not accepted^6,21. Inside American Falls, the city issues building permits²². Pocatello, mainly in Bannock County but reaching into Power County, also issues its own building permits²³. Septic permitting for Power County addresses remains with Southeastern Idaho Public Health; Pocatello also regulates sewer connection and eligibility for private septic^5,24. Idaho owners doing their own work on their own land without intending to sell within 12 months are exempt from contractor registration, but applicable permits and inspections still apply¹².

Power County has zoning districts, overlay districts and an official zoning map; land uses may require site-plan approval or a conditional-use permit, or may be prohibited³. The county rules here concern unincorporated land; Pocatello, a city reaching into Power County from Bannock County, has its own zoning, while septic permits remain with the health district^5,25. Power County lists dwelling setbacks of 50 feet along arterial roads and 35 feet along other roads, measured from property lines, plus 10-foot side and rear setbacks in AG or RR zones⁶. A permitted residence generally needs 1 acre; certain approved subdivisions with central systems may have smaller lots, capped at 3 residences per acre²⁶. In RR Rural Residential, minimum lots increase to 5 acres on slopes over 15 percent and 2.5 acres in groundwater-vulnerability areas on slopes of 8 to 15 percent; RR buildings are capped at 35 feet²⁷. Ask Building Administrator / Planning and Zoning for parcel standards and the county clerk about later ordinances that may supersede posted code^2,4.

Southeastern Idaho Public Health evaluates sites, issues septic permits and inspects installations in Power County under Idaho rules^5,28. The Power County office is at 590 1/2 Gifford, American Falls, ID 83211, phone (208) 226-5096⁵. Applications need a complete, signed and dated form, a warranty deed or tax notice, a to-scale plot plan and applicant-provided test holes 8 to 10 feet deep, depending on soil^8,29. The district lists $300 for a speculative site evaluation and $925 for a full evaluation and permit if suitable; fees may change⁸. Only 35.4 percent of county soils are rated without severe limitations for conventional drain fields, so resolve septic feasibility before choosing the house location³⁰. A septic system may not receive wastewater until final installation inspection and completion of as-built drawings; inspections requiring preparation need at least 48 hours’ notice, excluding weekends and holidays³¹. An onsite permit may be denied where public or central wastewater treatment is reasonably accessible³².

Unincorporated Power County prohibits using an RV or travel trailer as a single-family dwelling except to replace a home destroyed by fire or another catastrophe, for up to one year¹¹. County-owned or leased land allows camping only at designated recreational facilities, where stays are limited to 14 consecutive nights unless the operator authorizes more time³³. We could not confirm temporary camping rules for private land, tiny-home occupancy or a general minimum dwelling floor area; ask Power County Building Administrator / Planning and Zoning how the proposed structure and use fit the parcel’s zoning and building requirements^2,3. A manufactured home requires a county placement permit and inspection approval before occupancy under Idaho rules^2,34.

1. Ask Power County Building Administrator / Planning and Zoning to confirm the mapped zoning district, setbacks, subdivision restrictions and current forms^2,4,6.

1. Arrange the septic application and site evaluation with Southeastern Idaho Public Health⁸.

1. Have Power County Highway District personnel approve the travel way before seeking a building permit for a new dwelling^6,35. A driveway connecting to a state highway separately needs an Idaho Transportation Department encroachment permit³⁶.

1. If a private well is planned, obtain an Idaho Department of Water Resources drilling permit before drilling and use a state-licensed well driller¹⁴.

1. Submit the complete plans 10 to 14 days before building and obtain state electrical, plumbing or HVAC permits where applicable^6,16. Before applying for or using electrical service, secure the county building permit; structures exempt from the IBC receive a zoning permit number instead²¹.

1. Schedule the county’s six mandatory inspections, arrange the septic final inspection before wastewater use, then obtain the certificate of occupancy before using or occupying the regulated building^18,19,31.

Start with septic feasibility: only 35.4 percent of Power County soils are rated without severe limitations for a conventional drain field, and the health district requires test holes as part of its review^8,30. Confirm legal access early because the travel way to a new dwelling needs Power County Highway District approval before the building permit is issued³⁵. Construction, fill and other development in a special flood-hazard area require a development permit before work; all grading and excavation in the Floodplain Overlay District need a permit, including agricultural grading otherwise exempt^21,37. Water planning matters in a county averaging 16.1 inches of precipitation annually, and a new well needs an Idaho Department of Water Resources drilling permit before work starts^14,30. The effective property-tax rate is about 0.8 percent and the median annual property-tax bill is about $1,577³⁰.