Adams County, Idaho requires a building permit for a new residence through the county Building Department1. The county enforces building codes and administers zoning, while Southwest District Health handles septic review234. Confirm zoning and septic feasibility before fixing the house location.
At a glance
- Building permit
- Required for a new residence1
- Zoning
- Administered by Adams County Planning & Zoning5
- Setbacks
- 20 feet from a property line; 80 feet from a right-of-way center line6
- Septic
- Permitted by Southwest District Health4
- Agricultural buildings
- An exemption application exists; ask the Building Department about eligibility7
- RV and tiny-home living
- Not confirmed; ask Planning & Zoning5
- Well drilling
- IDWR permit required before drilling8
Who to call
Building permits
Adams County Building Department
Building forms, plan intake, code requirements and agricultural-building exemption applications
201 Industrial Ave. Council, ID 83612
Zoning
Adams County Planning & Zoning
Rezones, variances, boundary-line adjustments, conditional-use permits and land-change requests
201 Industrial Ave. Council, ID 83612
Septic permits
Septic permits, site evaluations and accessory-use approvals
Roads & driveways
County roads and the county right-of-way permit
201 N Main Council, ID 83612
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in Adams County, Idaho?
Yes. Adams County requires a building permit for a new residence, and the Building Department enforces the 2021 International Building Code and 2018 International Residential Code12. Idaho separately requires permits whenever electrical, plumbing or HVAC work is performed9. The county publishes materials for residential buildings, outbuildings and mobile or manufactured homes, and tells applicants to call for the current forms1011. A building-permit fee schedule is published, although the fee amounts were not available on the opened county page12.
Adams County publishes an agricultural-building exemption application, but the county page does not state its eligibility criteria, acreage thresholds, use restrictions or approval standards7. The application does not establish a general homeowner exemption for residential work13. Treat a farm structure and a house as separate permit questions, and ask the Building Department which approvals apply before ordering materials.
Who issues Adams County building permits, and how do you reach them?
The Adams County Building Department handles building forms and plan intake at 201 Industrial Ave. in Council; its number is (208) 253-4561 Option 411. Applicants delivering plans should bring two copies10. County requirements include a 20-foot setback from a property line and an 80-foot setback measured from the center line of a right-of-way, but the published page does not identify exceptions or district variations14.
Planning questions go to Adams County Planning & Zoning at the same address and at (208)-253-410615. For county right-of-way access, Road & Bridge publishes a permit and lists (208) 253-420316. A driveway connecting to an Idaho state highway instead requires an Idaho Transportation Department encroachment permit17.
Does Adams County have zoning?
Yes. Adams County conducts county-level zoning and planning review3. Planning & Zoning publishes applications for rezones, variances, boundary-line adjustments and conditional-use permits, plus materials for property splits and subdivision changes1815. The county page links its ordinances and comprehensive plan, but the opened material does not list zoning districts, dimensional tables or a zoning map19.
We could not confirm one county rule for RV occupancy, tiny-home occupancy, accessory dwellings, minimum dwelling size, minimum lot size, lot coverage or maximum building height. Ask Planning & Zoning about the parcel and intended use before treating any of those as allowed. If land lies inside Council or New Meadows, also verify the city's rules; the available county information does not establish the complete set of municipal ordinances.
How do septic permits work in Adams County?
Southwest District Health permits residential and commercial septic tanks and drainfields in Adams County20. Before issuing a permit, the district evaluates the site, and the applicant must arrange a backhoe for a 10-foot test hole21. Permits and evaluations do not transfer between owners; an evaluation cost may be credited when ownership stays the same and the application follows within one year21.
Only 0.3% of county soils are mapped without severe limits for a conventional drain field, so make the evaluation an early contingency22. Idaho requires inspections necessary to confirm a system complies with its permit and onsite-wastewater rules23. Extended Treatment Package systems require annual testing, inspection and maintenance by a licensed provider24. Subdivisions using individual wells and septic systems need an engineer-prepared Subdivision Engineering Report through Southwest District Health before sanitary restrictions can be released, and some projects may also need a Nutrient Pathogen Study25.
Can you live in an RV or tiny home on land in Adams County?
We could not confirm an Adams County rule generally allowing or prohibiting residence in an RV or tiny home on private land. Ask Planning & Zoning about the parcel, zoning district, occupancy period, utilities and whether the unit stays on wheels15. That office should also confirm local minimum-size or accessory-dwelling requirements.
A manufactured home follows a different path. Every Idaho manufactured-home installation must be inspected and approved by the state division or authority having jurisdiction before occupancy26. For a new manufactured home in an area without an approved local building program, a state installation permit and tag are required before installation begins27. Adams County also requires a Building Department inspection when a manufactured home is converted to real property28. Idaho Fish and Game camping limits concern Wildlife Management Areas and department access sites, not private-land residence rules29.
Building a home in Adams County: the steps, in order
- Ask Planning & Zoning to confirm the parcel's zoning and any land-use approval15.
- Sketch the house, septic area and access around the 20-foot property-line and 80-foot right-of-way-center-line setbacks30.
- Apply for the septic evaluation and arrange the 10-foot test hole21.
- Call the Building Department for current forms and bring two plan copies for office delivery10.
- Obtain required electrical, plumbing and HVAC permits9.
- Obtain an IDWR permit before well drilling8.
- Ask Road & Bridge about county access, or obtain an ITD permit for a state-highway driveway1617.
- Complete the required building and septic inspections before occupancy231.
What should you check before buying land in Adams County?
Start with buildable area, not total acreage. Only 16.5% of county land has a slope of 15% or less, and just 0.3% of mapped soils lack severe limits for a conventional drain field3122. A parcel survey and septic evaluation can show whether the house, replacement drain field, driveway and well fit together.
Adams County is 64.3% federal land and has 3.6 people per square mile, so confirm legal access, road responsibility and utility logistics rather than assuming nearby public land supplies access3233. Ask the Building Department about flood-zone information on the site plan, Planning & Zoning about use, and Road & Bridge about right-of-way access111516. Idaho requires a drilling permit before a well is drilled8.
Watch-outs
- The agricultural-building application does not establish a general owner-builder exemption or explain eligibility, acreage thresholds or permitted uses; ask the Building Department before relying on it713.
- A shop, outbuilding or other added structure needs Southwest District Health accessory-use approval before the county issues its building permit34.
- Adams County's RV, tiny-home, minimum-size and private-land camping rules could not be confirmed; ask Planning & Zoning about the parcel and use15.
Sources
- Adams County Building Department (2026 county census)
- Building Department | Adams County, Idaho, quoted and re-checked
- Planning & Zoning | Adams County, Idaho, quoted and re-checked
- Septic & Land Development – Southwest District Health, quoted and re-checked
- Adams County Planning & Zoning (2026 county census)
- Building Department | Adams County, Idaho, quoted and re-checked
- Building Department | Adams County, Idaho, quoted and re-checked
- Wells Overview (Idaho statewide rule), quoted and re-checked
- Frequently Asked Questions (FAQs) - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
- Building Department | Adams County, Idaho, quoted and re-checked
- Adams County Building Department (co.adams.id.us)
- Building Department | Adams County, Idaho, quoted and re-checked
- Building Department | Adams County, Idaho, quoted and re-checked
- Building Department | Adams County, Idaho, quoted and re-checked
- Adams County Planning & Zoning (co.adams.id.us)
- Adams County Road & Bridge (co.adams.id.us)
- Types of Right-of-Way Encroachment Permits (Idaho statewide rule), quoted and re-checked
- Planning & Zoning | Adams County, Idaho, quoted and re-checked
- Planning & Zoning | Adams County, Idaho, quoted and re-checked
- Septic & Land Development – Southwest District Health, quoted and re-checked
- Septic & Land Development – Southwest District Health, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- IDAPA 58.01.03 Individual/Subsurface Sewage Disposal Rules (Idaho statewide rule), quoted and re-checked
- Septic & Land Development – Southwest District Health, quoted and re-checked
- Septic & Land Development – Southwest District Health, quoted and re-checked
- Building Archives - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
- Frequently Asked Questions - Division of Occupational and Professional Licenses, quoted and re-checked
- Assessor's FAQ | Adams County, Idaho, quoted and re-checked
- Public Use of Department Lands and Access Areas (Idaho statewide rule), quoted and re-checked
- Building Department | Adams County, Idaho, quoted and re-checked
- Share of land at 15% slope or less: Bolthole Index county data
- Federal land share: Bolthole Index county data
- Population density: Bolthole Index county data
- Southwest District Health (swdh.id.gov)
Written September 29, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.