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

Yes. Valley County requires a permit before constructing, enlarging, altering, repairing, moving or demolishing a code-regulated building or structure, or changing its occupancy, within the county Building Department's jurisdiction¹. Shops, garages and tiny homes require full building permits, and structures over 3 feet tall require permits¹. The county administers the 2018 International Residential Code, 2018 International Building Code and 2018 International Energy Conservation Code under its adopted program². Idaho separately requires permits whenever electrical, plumbing or HVAC work is performed¹⁰. County projects proceed through excavation, footing, foundation, sheathing, framing, insulation and final inspections as applicable, with at least 24 hours' advance notice for an inspection request¹¹. State trade inspections must be approved before the county can complete its final inspection¹¹. Idaho exempts owners who build on their own land, and do not intend to sell within 12 months, from contractor registration only; the exemption does not waive building, electrical, plumbing or HVAC permits¹².

The Valley County Building Department issues building permits and performs plan review and inspections within its jurisdiction². The office is at 700 South Main Street, PO Box 1350, Cascade, ID 83611; call 208-382-7114 or email building@valleycountyid.gov². Applications currently must be mailed or delivered to the Cascade office because the department does not accept permit applications by email^2,13. A complete application includes the owner's signature, plans, structural calculations and site plans, and the county estimates processing at approximately 2 to 8 weeks depending on workload¹³. Plan-review charges are added to permits, while electrical, plumbing and HVAC fees are assessed by Idaho¹⁴. Planning & Zoning reviews building permits and handles zoning questions from its office at the same address; call (208) 382-7115¹⁵. Ask both offices which jurisdiction controls the parcel if it is in or near a city or area of city impact².

Yes. Valley County uses one performance-based Multiple Use zone in the county-administered jurisdiction; municipal zoning districts are separate³. Agriculture, including timber, and single-family residences are allowed uses, while most other uses require a permit under Valley County Code Title 9³. Residential setbacks are measured from the building eave: 20 feet from front or back property lines, 7.5 feet from side property lines and 30 feet from the high-water line; the setback from State Highway 55 is 100 feet¹¹. Subdivision covenants may be stricter, and the more restrictive setback controls¹¹. For new subdivisions and conditional-use parcels, minimum lot size varies with water and sewage service; a parcel using both an individual well and individual septic system has a 1-acre standard³. Valley County recognizes code-compliant tiny houses of 400 square feet or less excluding lofts, but we could not confirm a general minimum dwelling size; ask Planning & Zoning about a specific design^6,15. Maximum building height is 35 feet and maximum lot coverage is 35%, with 6 feet required between buildings¹¹.

A septic permit is required in Valley County, and Central District Health handles applications and records from its McCall office at 703 1st St., McCall, ID 83638; call 208-634-7194^4,16. Idaho's public health districts administer the statewide individual and subsurface sewage-disposal rules under an agreement with Idaho DEQ¹⁷. Valley County Planning & Zoning provides parcel approval for Central District Health septic applications, and Central District Health reviews subdivision proposals for release of sanitary restrictions^3,4. Idaho may deny an onsite-system permit when public or central wastewater treatment is reasonably accessible¹⁸. State rules require a final installation inspection before a new system receives wastewater, and required preparation calls for at least 48 hours' advance notice, excluding weekends and holidays¹⁹. Only 0.1% of mapped county soils are rated without severe limitations for a conventional drain field, so arrange a site evaluation before assuming a standard system will work²⁰.

Valley County recognizes a tiny house as a dwelling of 400 square feet or less excluding lofts and allows dwelling occupancy when the house complies with the adopted residential code, zoning, site-development, septic, setback, inspection and building-permit requirements⁶. Valley County limits an accessory dwelling unit to the lesser of 1,000 square feet or 50% of the primary structure, requires one residence to be owner-occupied, and requires compliant water and sewage service⁷. Residential ADU rentals must exceed 30 days; commercial, bed-and-breakfast or short-term-rental use requires a conditional use permit⁷. Under the county's RV-campground rule, one RV unit is allowed without a land-use permit; two or three units kept on-site beyond an occasional weekend require an administrative permit, and more than three require a conditional use permit⁵. Any RV rental use requires a conditional use permit and is treated as an RV park, while potable water, sewage disposal, gray-water, garbage, setback, parking, owner-occupancy, fire-management and lot-coverage conditions still apply⁵. An RV parked on wheels and licensed for road travel may be exempt from the building code, but that exemption does not remove the county's land-use conditions⁵.

1. Confirm the parcel's zoning, setbacks, legal access and any subdivision covenants with Valley County Planning & Zoning^11,15.

1. Arrange Central District Health's septic review early because only 0.1% of mapped county soils are rated without severe limitations for a conventional drain field^16,20.

1. Obtain an Idaho Department of Water Resources drilling permit before drilling a well⁸.

1. Secure driveway approval for a new public-road approach; an approach onto a state highway also requires an Idaho Transportation Department encroachment permit^1,9.

1. Deliver or mail the signed building application, plans, structural calculations and site plans to the Valley County Building Department^2,13.

1. Obtain the separate state electrical, plumbing and HVAC permits required for that work¹⁰.

1. Schedule county inspections with at least 24 hours' notice and complete state trade finals before the county final inspection¹¹.

Start with buildability: only 16.1% of Valley County land has a slope of 15% or less, and only 0.1% of mapped soils are rated without severe limitations for a conventional septic drain field²⁰. Federal ownership covers 87.8% of the county, so verify documented legal access rather than assuming a nearby road or trail creates private access²⁰. A new public-road approach requires county approval, and a state-highway approach requires state encroachment approval^1,9. Development in a mapped special flood hazard area uses Valley County's floodplain permit process, which can cover buildings, grading, wells, septic systems and road work; a pre-application meeting is required²¹. A project in a regulatory floodway also requires a No-Rise Certificate²¹. Confirm the parcel's floodplain status with Planning & Zoning¹⁵. The effective property-tax rate is about 0.3%, with a median annual bill of about $1,778²⁰.