Bolthole Index

Idaho County, Idaho

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

69Index Score / 100
#10 of 44 in Idaho

Unincorporated Idaho County, Idaho does not require a county building permit outside city limits and city areas of impact, although state requirements still apply12. County zoning classifies unincorporated land as multi-use with no restrictions except those imposed by other applicable ordinances34. New and repaired septic systems require permits from Public Health – Idaho North Central District5.

At a glance

Building permit
No county permit outside city limits and city areas of impact; state requirements still apply12
Zoning
All unincorporated land is multi-use with no restrictions except other applicable ordinances34
Septic permits
Required for new and repaired systems through Public Health – Idaho North Central District56
RV living
County zoning does not restrict it on private unincorporated land, subject to other ordinances and state requirements7
Tiny homes
County zoning does not restrict occupancy on unincorporated land; mobile or manufactured units face separate rules8
Owner-builder
Available because no county building permit is required; state trade rules still apply910
Minimum home size / setbacks
No county zoning minimum or setback in unincorporated areas, subject to other ordinances and state rules1112
Wells
A drilling permit from the Idaho Department of Water Resources is required before drilling13

Who to call

Building permits

Idaho County (Building/Living referral contacts, Board of County Commissioners)

Official referrals for state trade, septic, energizing and well permits where no county building department exists

Idaho County Courthouse, 320 West Main Street, Grangeville, ID 83530

Septic permits

Public Health - Idaho North Central District

Permits new and repaired septic systems and conducts site evaluations and compliance inspections in Idaho County

208-799-3100

215 10th Street, Lewiston, ID 83501

Roads & driveways

Idaho County Road Department (Road & Bridge)

Issues approach and utility permits for roads maintained by the Idaho County Road Department

(208) 926-4471

[email protected]

4682 Highway 13 Kooskia, Idaho 83539

Contact details are copied from each office’s official page and were checked against it on September 28, 2026.

Do you need a building permit in Idaho County, Idaho?

No county building permit is required for property in unincorporated Idaho County outside city limits and city areas of impact12. Idaho County has not adopted a county building-code program for those properties, but state requirements remain in force14. Electrical, plumbing and HVAC work still requires state-administered permits15. A new manufactured home requires a state installation permit and tag, and every manufactured-home installation must be inspected and approved before occupancy1617. An owner may build on the owner's own land without a county building permit, while state licensing and trade-permit rules can still apply910. The separate contractor-registration exemption applies when owners do their own work on their own land and do not intend to sell within 12 months18.

Who handles building permits in Idaho County, and how do you reach them?

Idaho County has no general county building department for property outside cities and city areas of impact; its official Building/Living page directs owners to the agencies that administer the remaining permits1920. For sewer and energizing permits, the county page lists North Central Public Health at 208-983-284220. For well drilling, it lists the driller or the Idaho Department of Water Resources at 208-762-280020. For plumbing and electrical permits, it lists the contractor or the Idaho Division of Occupational and Professional Licenses at 208-334-323320. Idaho County's referral page is associated with the courthouse at 320 West Main Street, Grangeville, ID 8353020. Before relying on the county process, confirm that the parcel is outside every incorporated city and city area of impact because those jurisdictions may administer different building rules2.

Does Idaho County have zoning?

Idaho County has a zoning ordinance, but Ordinance 67 classifies all unincorporated land as multi-use with no restrictions except restrictions in other applicable ordinances34. County zoning therefore sets no minimum dwelling size, minimum lot size, setback or lot-coverage limit for ordinary unincorporated parcels11211222. Those answers do not override subdivision rules, mobile- and manufactured-home rules, state requirements or city-area-of-impact rules4. Parcel divisions remain regulated under the county subdivision ordinance, and the Grangeville Area of City Impact uses Grangeville subdivision and building rules23. Buildings principally agricultural in nature are exempt from city building codes within that impact area, but dwellings are not agricultural buildings for that exemption24. Airport safety zones can separately restrict the height and placement of structures and trees25.

How do septic permits work in Idaho County?

Public Health – Idaho North Central District issues permits for every new and repaired septic system in Idaho County and evaluates proposed sites56. Idaho's Department of Environmental Quality establishes the statewide rules, while the public health district administers them locally2627. The district performs compliance inspections, and a new system cannot receive wastewater before the required final installation inspection2829. Mapped soils are a major constraint: 0% of county soils are rated free of severe limitations for a conventional drain field, so obtain the site evaluation before choosing a house location or assuming a standard system will work30. A different county permit applies to the business of cleaning septic tanks, cesspools or sewage pits: the annual registration application carries a $10 fee and requires a $2,000 surety or property bond31.

Can you live in an RV or tiny home on land in Idaho County?

Idaho County zoning does not restrict recreational-vehicle occupancy or temporary camping on private land in unincorporated Idaho County, provided no other applicable ordinance or state requirement governs the use732. Idaho County zoning likewise does not restrict tiny-home or accessory-dwelling occupancy on unincorporated land under the same conditions833. A tiny home classified as a mobile or manufactured home remains subject to the separate mobile- and manufactured-home rules8. A new manufactured home requires a state installation permit and inspection before occupancy1617. Wastewater still needs an approved system: property owners must connect wastewater-discharging plumbing fixtures to an approved wastewater system or facility34. These county answers do not apply inside incorporated cities or city areas of impact78.

Building a home in Idaho County: the steps, in order

  1. Confirm that the parcel is outside city limits and every city area of impact; the county's no-permit answer depends on that location2.
  1. Check subdivision status and airport overlays before fixing the building site2325.
  1. Ask Public Health – Idaho North Central District for a septic site evaluation, then obtain the installation permit before work begins635.
  1. Obtain an Idaho Department of Water Resources drilling permit and use a licensed well driller if the property needs a well13.
  1. Arrange state permits for electrical, plumbing and HVAC work15.
  1. Obtain an approach permit before connecting to an Idaho County-maintained road, or an Idaho Transportation Department encroachment permit for a state highway3637.
  1. Schedule the required septic final inspection before sending wastewater to the system29.

What should you check before buying land in Idaho County?

Start with a septic evaluation and a topographic review: 0% of mapped county soils are free of severe conventional-drain-field limitations, and only 12% of county land has a slope of 15% or less3038. Confirm legal and physical access because an approach onto a county-maintained road needs a county permit, while an approach onto a state highway needs a state encroachment permit3637. Verify whether a well is feasible and budget for the required state drilling permit13. Check municipal boundaries, areas of impact, subdivision status and airport safety zones because each can change the otherwise open county zoning answer2325. Idaho County is 77.4% wooded and 84.4% federally owned, so confirm that advertised acreage, access and adjoining land ownership match the deed and survey3940. The effective property-tax rate is about 0.3%, and the median annual property-tax bill is about $9744142.

Watch-outs

  • Idaho County's no-building-permit and open-zoning answers apply only outside incorporated cities and city areas of impact24.
  • County zoning allows RV, tiny-home and accessory-dwelling occupancy on unincorporated private land, but other applicable ordinances and state wastewater, trade and manufactured-home requirements can still control the project7833.
  • We could not confirm a current countywide floodplain-development rule after the prior flood ordinance was rescinded; ask the Board of County Commissioners what applies to a parcel in a mapped flood-hazard area20.
  • We could not confirm a general certificate-of-occupancy rule for ordinary buildings in unincorporated Idaho County; ask the Board of County Commissioners and the relevant state trade-permit offices before occupancy20.

Sources

  1. Building/Living in Idaho County (2026 county census)
  2. Building/Living in Idaho County, quoted and re-checked
  3. Idaho County Ordinance No. 67 (2026 county census)
  4. Idaho County Ordinance No. 67, quoted and re-checked
  5. Septic Systems – Public Health – Idaho North Central District, quoted and re-checked
  6. Public Health - Idaho North Central District (idahopublichealth.com)
  7. Idaho County Ordinance No. 67, quoted and re-checked
  8. Idaho County Ordinance No. 67, quoted and re-checked
  9. Building/Living in Idaho County (2026 county census)
  10. Idaho law on county zoning and building authority
  11. Building/Living in Idaho County, quoted and re-checked
  12. Idaho County Ordinance No. 67, quoted and re-checked
  13. Wells Overview, quoted and re-checked
  14. Building/Living in Idaho County, quoted and re-checked
  15. Frequently Asked Questions (FAQs) - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
  16. Building Archives - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
  17. Building Archives - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
  18. Contractors Archives, quoted and re-checked
  19. Building/Living in Idaho County, quoted and re-checked
  20. Idaho County (Building/Living referral contacts, Board of County Commissioners) (idahocounty.org)
  21. Idaho County Ordinance No. 67, quoted and re-checked
  22. Idaho County Ordinance No. 67, quoted and re-checked
  23. Building/Living in Idaho County, quoted and re-checked
  24. 34. Grangeville Area of Impact Ordinance, quoted and re-checked
  25. 19. Airport Zoning Ordinance, quoted and re-checked
  26. Septic and Septage (Idaho statewide rule), quoted and re-checked
  27. Septic Systems – Public Health – Idaho North Central District, quoted and re-checked
  28. Septic Systems – Public Health – Idaho North Central District, quoted and re-checked
  29. IDAPA 58.01.03 Individual/Subsurface Sewage Disposal Rules (Idaho statewide rule), quoted and re-checked
  30. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  31. 2. Sanitary Code, quoted and re-checked
  32. Idaho County Ordinance No. 67, quoted and re-checked
  33. Idaho County Ordinance No. 67, quoted and re-checked
  34. IDAPA 58.01.03 – Individual/Subsurface Sewage Disposal Rules and Rules for Cleaning of Septic Tanks, quoted and re-checked
  35. Septic Systems – Public Health – Idaho North Central District, quoted and re-checked
  36. Road and Bridge, quoted and re-checked
  37. Types of Right-of-Way Encroachment Permits (Idaho statewide rule), quoted and re-checked
  38. Share of land at 15% slope or less: Bolthole Index county data
  39. Wooded share of land: Bolthole Index county data
  40. Federal land share: Bolthole Index county data
  41. Effective property tax rate: Bolthole Index county data
  42. Median property tax bill: Bolthole Index county data

Written September 28, 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.

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County locator

Idaho County in Idaho

69
County map
Idaho County highlighted among the Idaho counties · colored by Index score

How Idaho County scores

Seclusion89100% ev.
Self-Sufficiency41100% ev.
Admin Boringness69100% ev.
Durability36100% ev.
Property Autonomy90100% ev.
Carry Cost81100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$365kTypical home
0.3%Property tax
$2,367Land / acre
36.9"Annual rain
9.1% of yrsSevere drought
1.3 / yr (+1.2)Mid-century 100°F days
20.3 daysMid-century dry spell
1.38" (+5.9%)Mid-century 1-day rain
1.26×Wildfire change factor
100%Forward climate coverage
$1,195Home insurance / yr
1.9% / yrInsurance growth
1.74%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
46,842People within 2 hr
1,534Radius comparison (15 mi)
2.1People / sq mi
84.4%Federal land
12%Land at 15% slope or less
0%Septic soil without severe limits
981 acWorkable land screen
77.4%Wooded land
46.3 tonsBiomass / forest ac
42.2°FAvg temp

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Answers from the rulebook for Idaho County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Idaho County rules

  • Building permitNot required

    County building permits for properties outside Idaho County city limits or city areas of impact

    • State building requirements may still apply.
    • This claim does not determine permit requirements administered by incorporated municipalities or their areas of impact.
    “At present, the only building requirements in Idaho County for properties outside of city limits or city ‘areas of impact” are State requirements.”
  • Owner-builder exemption · follows from the permit answerNot needed

    Unincorporated Idaho County: no county building permit is required, so there is no permit to be exempt from and you may build your own home. State licensing for electrical, plumbing and HVAC work may still apply.

    • State building requirements may still apply.
    • This claim does not determine permit requirements administered by incorporated municipalities or their areas of impact.
    “At present, the only building requirements in Idaho County for properties outside of city limits or city ‘areas of impact” are State requirements.”
  • Building code adoptedNot adopted (with conditions)

    County building-code requirements for properties outside incorporated city limits and city areas of impact.

    • The county's official page states that only State requirements apply outside city limits or city areas of impact.
    • This finding does not establish the building-code adoption status of incorporated municipalities or city areas of impact.
    • Other county ordinances may regulate subdivisions, mobile or manufactured homes, flood hazards, historic preservation, or septic-related energizing without constituting a general county building code.
    “At present, the only building requirements in Idaho County for properties outside of city limits or city ‘areas of impact” are State requirements.”
    One more reviewed finding on this topic
    • Not adopted (with conditions) — County building-code adoption for properties outside Idaho County city limits or city areas of impact.
      “At present, the only building requirements in Idaho County for properties outside of city limits or city ‘areas of impact” are State requirements.”
  • County-wide zoningPresent (with conditions)

    Land in the unincorporated areas of Idaho County.

    • All unincorporated land is classified as multi-use with no restrictions.
    • Restrictions in other applicable ordinances remain applicable, including Idaho County Ordinance 70 concerning subdivisions and Idaho County Ordinance 53 concerning mobile and manufactured homes.
    • The rule does not state that it governs incorporated city limits or city areas of impact.

    classification: multi-use (No restrictions except restrictions contained in an applicable ordinance adopted before or after Ordinance 67) · adoption date: 2020-02-18

    “In accordance with the provisions of Idaho Code, all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained in an applicable ordinance therebefore or hereinafter adopted.”
    One more reviewed finding on this topic
    • Present (with conditions) — All unincorporated areas of Idaho County.
      “all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions”
  • Local zoningPresent (with conditions)

    Land in the unincorporated areas of Idaho County.

    • Idaho County Ordinance No. 67 applies to all unincorporated areas of Idaho County.
    • All unincorporated land is classified as multi-use with no restrictions except restrictions contained in an applicable ordinance adopted before or after Ordinance No. 67.
    • The ordinance states that its requirements are minimum requirements.
    • The ordinance is dated February 18, 2020.

    land classification: multi-use (no restrictions except those contained in an applicable ordinance)

    “WHEREAS, this ordinance applies to all unincorporated areas of Idaho County; [...] all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained in an applicable ordinance therebefore or hereinafter adopted.”
  • Zoning districtsPublished (with conditions)

    All land in the unincorporated areas of Idaho County

    • All unincorporated land is classified as multi-use with no restrictions under Ordinance 67.
    • Exceptions apply for restrictions contained in applicable ordinances adopted before or after Ordinance 67, including the county's subdivision and mobile/manufactured-home ordinances.
    • The ordinance states it was dated February 18, 2020.
    • Incorporated cities and city areas of impact are outside this claim's scope.

    district classification: multi-use (No restrictions except those contained in an applicable ordinance adopted before or after Ordinance 67)

    “In accordance with the provisions of Idaho Code, all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained in an applicable ordinance therebefore or hereinafter adopted.”
  • Minimum dwelling sizeNone

    County zoning in unincorporated Idaho County outside incorporated city limits and city areas of impact.

    • This is an absence of a county zoning minimum dwelling-size requirement, not an exemption from applicable state requirements.
    • Idaho County Ordinance 67 preserves restrictions in other applicable ordinances, including Ordinance 53 for mobile and manufactured homes and Ordinance 70 for subdivisions.
    • Municipal and city-area-of-impact rules may apply instead.
    “In accordance with the provisions of Idaho Code, all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained in an applicable ordinance therebefore or hereinafter adopted.”
    One more reviewed finding on this topic
    • None — Residential dwelling size in unincorporated Idaho County outside city limits and city areas of impact.
      “At present, the only building requirements in Idaho County for properties outside of city limits or city ‘areas of impact” are State requirements.”
  • Minimum lot sizeNone

    County zoning minimum lot size in unincorporated Idaho County outside incorporated city limits and city areas of impact.

    • This is an absence of a county zoning minimum lot-size requirement.
    • Subdivision regulations, airport zoning, mobile/manufactured-home rules, state requirements, and municipal or city-area-of-impact rules may impose separate limits.
    “In accordance with the provisions of Idaho Code, all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained in an applicable ordinance therebefore or hereinafter adopted.”
  • SetbacksNone

    County zoning setbacks in unincorporated Idaho County outside incorporated city limits and city areas of impact.

    • This is an absence of a county zoning setback requirement.
    • Other applicable county ordinances, airport zoning, state requirements, subdivisions, and municipal or city-area-of-impact rules may impose location or separation requirements.
    “In accordance with the provisions of Idaho Code, all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained in an applicable ordinance therebefore or hereinafter adopted.”
  • Lot coverageNone

    Lot coverage in unincorporated Idaho County outside city limits and city areas of impact.

    • Idaho County Ordinance 70 subdivision standards and other applicable ordinances remain applicable.
    • State requirements may apply.
    “In accordance with the provisions of Idaho Code, all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained in an applicable ordinance therebefore or hereinafter adopted.”
    One more reviewed finding on this topic
    • None — County zoning lot-coverage limits in unincorporated Idaho County outside incorporated city limits and city areas of impact.
      “In accordance with the provisions of Idaho Code, all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained in an applicable ordinance therebefore or hereinafter adopted.”
  • Building heightNone

    Building height in unincorporated Idaho County outside city limits and city areas of impact.

    • Other applicable ordinances, including any airport-related restrictions, may apply.
    • Idaho County Ordinance 70 subdivision requirements and state requirements remain applicable.
    “In accordance with the provisions of Idaho Code, all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained in an applicable ordinance therebefore or hereinafter adopted.”
    One more reviewed finding on this topic
    • District specific (with conditions) — Structures and trees within the Idaho County Airport Zoning Ordinance airspace and safety zones.
      “Except as otherwise provided in this Ordinance, and except as necessary and incidental to airport operations, no structure or tree shall be constructed, altered, maintained, or allowed to grow in any airspace zone created in Subsection IV A so as to project above any of the imaginary airspace surfaces described in said Subsection IVA hereof.”
  • Living in an RVLimited

    Recreational vehicles placed on sites in unincorporated Idaho County flood-hazard zones A1-30, AH, and AE shown on the community FIRM.

    • The recreational vehicle must be on site for fewer than 180 consecutive days; or
    • It must be fully licensed and ready for highway use, on its wheels or jacking system, attached only by quick-disconnect utilities and security devices, and have no permanently attached additions; or
    • It must meet the manufactured-home requirements in section 5.2-3 and the elevation and anchoring requirements for manufactured homes.

    maximum site duration under first alternative: < 180 consecutive days

    “Recreational vehicles placed on sites within Zones Al-30, AH, and AE on the community’s FIRM either must:”
    One more reviewed finding on this topic
    • Unrestricted — Recreational-vehicle occupancy on private land in unincorporated Idaho County, to the extent the use is not governed by another applicable ordinance or state requirement.
      “all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained”
  • Camping on your landUnrestricted

    Temporary camping on private land in unincorporated Idaho County, to the extent the use is not governed by another applicable ordinance or state requirement.

    • Ordinance 67 states that the no-restrictions classification is subject to restrictions in applicable ordinances adopted before or after it.
    • Subdivision rules under Ordinance 70 and state health, sewer, well, plumbing, and electrical requirements may apply.
    • This claim does not address incorporated cities or their areas of impact.
    “all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained”
  • Tiny homesUnrestricted

    Tiny-home occupancy in unincorporated Idaho County, to the extent the use is not governed by another applicable ordinance or state requirement.

    • Ordinance 67 classifies all unincorporated land as multi-use with no restrictions except restrictions in applicable ordinances.
    • If the tiny home is a mobile or manufactured home, Ordinance 53 and other applicable mobile/manufactured-home rules may apply.
    • Subdivision rules under Ordinance 70 and state requirements may apply.
    • This claim does not address incorporated cities or their areas of impact.
    “all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained”
  • Manufactured homesLimited

    Installation and continued use of mobile or manufactured homes constructed before June 15, 1976, in rural and unincorporated Idaho County.

    • Before installation, the older unit must satisfy Idaho Code sections 44-2501 through 44-2504 rehabilitation requirements.
    • Before installation, the owner must receive eight certificates of compliance from the Idaho Division of Public Safety.
    • A written application to the Idaho County Clerk is required; the permit is issued after receipt of the appropriate certificate of compliance.
    • There is no fee for the county's administration of this permit system.
    • Units existing in unincorporated Idaho County before adoption may continue at their existing site, but may not be used at another unincorporated site unless they meet the rehabilitation requirements.
    • The ordinance states it becomes effective upon passage, approval, and publication; it was passed July 11, 2005.

    construction cutoff: < June 15, 1976 (Units constructed before this date are subject to the ordinance.) · required certificates of compliance: 8 certificates · county permit administration fee: 0 USD

    “installed shall be defined as the placing, by any means, a unit anywhere within the unincorporated limits of Idaho County”
    One more reviewed finding on this topic
    • Limited — Installed mobile or manufactured homes in rural Idaho County being converted to real property.
      “The applicant shall have the responsibility of paying all costs of the inspector’s services”
  • Accessory dwellingsUnrestricted

    Accessory-dwelling occupancy in unincorporated Idaho County, to the extent the use is not governed by another applicable ordinance or state requirement.

    • Ordinance 67 provides no county zoning restrictions in unincorporated areas except restrictions in applicable ordinances.
    • The county’s Building/Living page specifically identifies subdivision rules under Ordinance 70 and mobile/manufactured-home rules under Ordinance 53 as exceptions.
    • State requirements, including sewer, well, plumbing, and electrical requirements, may apply.
    • This claim does not address incorporated cities or their areas of impact.
    “all land in the unincorporated areas of Idaho County is hereby classified as multi-use with no restrictions except for those restrictions contained”
  • Who permits septicCounty (with conditions)

    Cleaning septic tanks, cesspools, sewage pits, or other means of sewage disposal within Idaho County.

    • A registration permit from the health officer is required.
    • The application must use the health officer's form and include a $10.00 fee.
    • The registration permit is annual, revocable for noncompliance, valid only for the unexpired portion of the license year, and expires at the end of the license year.
    • Applicants must provide a $2,000.00 surety or property bond approved as specified by the ordinance.

    registration fee: 10 USD · bond: 2000 USD (surety bond or property bond)

    “Application shall be made upon a form provided by the health officer and shall be accompanied by a $10.00 fee.”
    2 more reviewed findings on this topic
    • Mixed (with conditions) — Individual and subsurface sewage disposal systems serving Idaho County within the Public Health–Idaho North Central District service area.
      “regulated by the Idaho Dept. of Environmental Quality (DEQ) Rules”
    • Local — Idaho County properties served by Public Health–Idaho North Central District, including unincorporated areas and municipalities within the district.
      “Idaho’s seven public health districts administer these rules under a memorandum of understanding (MOU) with DEQ. The public health districts conduct site evaluations, issue septic system permits, inspect installations, and assist with property-specific questions about permitting, existing systems, and permit records.”
  • Septic permitRequired

    New, repaired, modified, expanded, or installed individual or subsurface sewage disposal systems in Idaho County within Public Health–Idaho North Central District.

    • The district issues permits for all new and repaired septic systems.
    • Under current IDAPA 58.01.03, no person may modify, repair, expand, or install an individual or subsurface sewage disposal system without a valid installation permit except the listed permit exceptions.
    • Portable nondischarging temporary systems may be installed without an installation permit only if properly maintained and of a design approved by the Director.
    • Repairs for clogged or broken solid piping or electrical or mechanical malfunctions may be performed without a permit, but may not expand the system unless authorized by the Director.
    • Permit applications must be submitted in an approved form and fees are governed by IDAPA 58.01.14.

    permit exception: portable nondischarging temporary system (Must be properly maintained and of a design approved by the Director.)

    “Except as specified in Subsection 005.02 no person may modify, repair or expand or install any individual or subsurface sewage disposal system within the state of Idaho unless there is a valid installation permit authorizing that activity.”
    One more reviewed finding on this topic
  • Septic inspectionLimited

    On-site sewage systems in Idaho County served by Public Health – Idaho North Central District.

    • Public Health – Idaho North Central District performs inspections to determine compliance with regulations; the cited page does not state that every onsite sewage system must be inspected.
    • The district serves Idaho County along with Clearwater, Latah, Lewis, and Nez Perce Counties.
    • The district also issues permits for all new and repaired septic systems and enforces the Idaho Department of Environmental Quality rules.
    “Perform inspections of on-site sewage inspection to determine compliance with regulations.”
  • Subdividing landRegulated (with conditions)

    Subdivision and parcel division in unincorporated Idaho County, subject to the exceptions and jurisdictional limits in the applicable subdivision ordinance.

    • The county’s building/living page identifies Ordinance 70 as pertaining to subdivisions.
    • Ordinance 70 is identified on the official county document as effective May 27, 2020.
    • The Grangeville Area of City Impact applies city subdivision ordinances within that impact area.
    • Existing plats, exempt parcel divisions, and other exceptions in Ordinance 70 must be checked for the specific parcel.
    “The Board of County Commissioners also approved and adopted Idaho County Ordinance 67, establishing and classifying all land in the unincorporated areas of Idaho County as multi-use with no restrictions except for Idaho County Ordinance 70 pertaining to subdivisions and Idaho County Ordinance 53 pertaining to mobile and manufactured homes.”
  • Driveway accessRequired

    Approaches providing access to roads maintained by the Idaho County Road Department

    • The requirement applies to roads maintained by the Idaho County Road Department, not necessarily every public or private road in the county.
    • The county page also identifies utility permits separately.
    “Idaho County requires approach and utility permits on all roads maintained by the Idaho County Road Department”
  • Permit processPartial

    Building-related requirements for properties outside Idaho County city limits or city areas of impact

    • The county page states that only State requirements apply in these areas.
    • Requirements may differ inside incorporated cities and city areas of impact.
    • The page directs applicants to North Central Public Health for sewer and energizing permits, the Idaho Department of Water Resources or a well driller for well permits, and the Idaho Division of Occupational and Professional Licenses for plumbing and electrical permits.
    “At present, the only building requirements in Idaho County for properties outside of city limits or city ‘areas of impact” are State requirements. The following contact information is provided to assist property owners in determining the proper course of action.”

Idaho rules that apply here

  • InspectionsRequired

    All manufactured-home installations in Idaho before the manufactured home is occupied.

    • The inspection and approval are performed by DOPL or the authority having jurisdiction.
    • Inspection and approval must occur before occupancy.
    “All installations must be inspected and approved by the Idaho Division of Occupational and Professional Licenses or the authority having jurisdiction before the manufactured home is occupied.”
    One more reviewed finding on this topic
    • Required — Manufactured-home installations in Idaho areas without an approved local building program, including applicable Idaho County locations
      “All installations must be inspected and approved [...] before the manufactured home is occupied.”
  • Well permitRequired

    Construction or drilling of wells in Idaho, including domestic wells.

    • Before drilling, the well owner or driller must obtain a drilling permit from IDWR.
    • All wells must be constructed by a well driller with a valid IDWR license.
    • The separate water-right permit exemption for domestic purposes does not eliminate the drilling-permit requirement.
    • For new diversions in qualifying subdivisions filed on or after July 1, 2025, a water-right permit is required in a moratorium area, critical groundwater area, or groundwater management area, except for in-home uses and watering livestock.
    • Well construction rules apply to wells and other artificial openings more than 18 vertical feet below land surface.

    well depth threshold: > 18 vertical feet below land surface (The cited well-construction rules describe covered wells and artificial openings.) · subdivision application date: >= 2025-07-01 (Applies to qualifying new diversions described in Idaho Code § 42-227(4).)

    “Prior to drilling a well, the well owner or well driller must first obtain a drilling permit from IDWR.”
    One more reviewed finding on this topic
    • Required — Drilling a domestic or other water well in Idaho County.
      “Prior to drilling a well, the well owner or well driller must first obtain a drilling permit from IDWR. All wells must be constructed by a well driller with a valid license from IDWR.”
  • Mandatory utility hookupConditional

    Plumbing fixtures on Idaho County property that discharge wastewater.

    • Every owner of real property is responsible for connecting wastewater-discharging plumbing fixtures to an approved wastewater system or facility.
    • The rule does not itself require connection to a public sewer specifically; an approved onsite wastewater system may satisfy the requirement.
    • Local zoning, building, fire, safety, or health regulations may impose a higher standard where applicable.
    “Connecting all plumbing fixtures on the property that discharge wastewaters to an approved wastewater system or facility.”
    One more reviewed finding on this topic
    • Conditional — Proposed individual or subsurface sewage disposal systems where public or central wastewater treatment facilities may be available.
      “Public or central wastewater treatment facilities are reasonably accessible.”

Inside cities and towns in Idaho County

Municipal rules found while researching the county. They apply inside that city or town, not to unincorporated land.

  • Agricultural exemptionConditional

    Buildings principally agricultural in nature within the Grangeville Area of City Impact in unincorporated Idaho County.

    • The exception applies only within the Impact Area.
    • The exception does not apply where state law applies.
    • The exception does not apply to dwellings.
    • The City of Grangeville administers building permits and inspections for nonagricultural buildings and dwellings within the Area of Impact.
    • The county airport zoning ordinance remains in force in the Area of Impact.
    “However, within the Impact Area, except where state law applies, buildings which are principally agricultural in nature shall not be subject to the stated City Uniform Codes. This exception shall not apply to dwellings.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Certificate of occupancy — Certificates of occupancy for buildings in unincorporated Idaho County
  • Off-grid sanitation — Off-grid sanitation systems in Idaho County.
  • Building in a floodplain — Development in flood-hazard areas outside incorporated cities in Idaho County
  • Short-term rentals — Short-term rentals in Idaho County
  • Permit fees — County-administered permit fees in Idaho County

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Idaho County, Idaho

Is Idaho County a good place to live off-grid or homestead?

Idaho County scores 69/100 on the Bolthole Index, a strong county profile. Its strengths: a stronger property-autonomy legal backdrop and deep seclusion — about 1,534 people within 15 miles. Watch-outs: elevated current hazard exposure and limited workable ground: 12% at 15% slope or less and 0% without a severe conventional-septic limitation.

Do you need a building permit in Idaho County, Idaho?

Idaho County does not require a county building permit for a home in unincorporated areas, and it enforces county zoning. Onsite septic is permitted by Public Health - Idaho North Central District. Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Idaho County?

Living in an RV on your own land in Idaho County is limited to specific cases: Recreational vehicles placed on sites in unincorporated Idaho County flood-hazard zones A1-30, AH, and AE shown on the community FIRM. The recreational vehicle must be on site for fewer than 180 consecutive days; or It must be fully licensed and ready for highway use, on its wheels or jacking system, attached only by quick-disconnect utilities and security devices, and have no permanently attached additions; or A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Idaho County, Idaho?

Land in Idaho County runs about $2,367 per acre, based on the latest county data.

What is the water situation in Idaho County?

Idaho County gets about 36.9" of rain a year, with severe drought in roughly 9.1% of years.

How remote is Idaho County?

A typical private-land location has about 1,534 people within 15 miles and 331,382 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Off-grid gear

Going off-grid in Idaho County means bringing your own water and power. The kit we’d start with:

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How Idaho compares in Idaho

Compare side-by-side →See all 44 Idaho counties ranked →