Bolthole Index

Clark County, Idaho

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

44Index Score / 100
#35 of 44 in Idaho

Clark County, Idaho publishes a building-permit application, but we could not confirm the rule that says exactly which projects in unincorporated Clark County need one; ask the county Planning & Zoning office before construction1. Clark County has zoning materials, while electrical, plumbing and HVAC work requires permits under Idaho's state program23. Eastern Idaho Public Health handles septic permits and inspections for Clark County45.

At a glance

Building permit
Application published; project-by-project requirement not confirmed1
Zoning
Yes; county zoning-district materials are published26
Septic permit
Eastern Idaho Public Health issues permits and conducts inspections45
Trade permits
Required for electrical, plumbing and HVAC work3
RV or tiny-home living
Local private-land occupancy rules not confirmed; ask Planning & Zoning2
Owner-builder exemption
Not confirmed; ask Planning & Zoning and the relevant state trade office7
Private well
An IDWR drilling permit is required before drilling8

Who to call

Planning & zoning

Clark County Planning & Zoning

Questions about Clark County planning, zoning and county permit applications

208-374-5271

224 W Main St., Dubois, ID 83423

Septic permits

Eastern Idaho Public Health Environmental Health

Septic applications, site evaluations, permits and inspections for Clark County

208-523-5382

Online permits →

Contact details are copied from each office’s official page and were checked against it on September 27, 2026.

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

Possibly, but confirm the project with Clark County Planning & Zoning before starting. Clark County's official index publishes a building-permit application along with site-plan requirements, yet the available county material does not establish the complete processing rules or the precise projects that trigger approval1. Idaho has adopted statewide building codes, although how the local government applies them depends on the Idaho Building Code Act9. Electrical, plumbing and HVAC work requires a permit under the state-administered program, subject to any local program that administers those trades3. A new manufactured home in an area without an approved local building program needs a state installation permit and tag before installation, and every manufactured-home installation must be inspected and approved before occupancy1011.

Who handles Clark County building and zoning questions?

Clark County Planning & Zoning is the first call for a rural building project: the office can be reached at 208-374-5271 at 224 W Main St., Dubois, ID 8342312. The county's published application index includes building, floodplain, subdivision, lot-split, variance, zone-change, conditional-use and approach applications, but it does not supply a complete rule for when each approval applies1. Ask the office to identify the parcel's zoning district, the required applications and the current fee resolution before commissioning final plans. Clark County publishes planning and zoning fee resolutions, including an updated fee resolution, but the current dollar amounts were not verified13. For electrical, plumbing or HVAC work, also determine whether the applicable permit will come from Idaho's state program or a locally administered program3.

Does Clark County, Idaho have zoning?

Yes. Clark County currently lists a Planning and Zoning Administrator, and the county's ordinance index lists current zoning districts and a planning-area map26. The available material does not establish all district boundaries or dimensional standards, so do not infer that rural acreage is unrestricted. Ask Clark County Planning & Zoning to confirm the parcel's district and whether a proposed house, cabin, RV, tiny home, accessory dwelling or agricultural building is an allowed use12. We could not confirm countywide answers for minimum dwelling size, minimum lot size, setbacks, lot coverage, building height or an agricultural exemption. Incorporated municipalities may have their own rules, and the available county material does not establish the full set of municipal requirements6.

How do septic permits work in Clark County?

Eastern Idaho Public Health serves Clark County and provides septic rules, applications and related forms5. Its Environmental Health program reviews wastewater applications, performs onsite evaluations, issues permits and conducts inspections; call 208-523-538214. Idaho's public health districts administer the state's subsurface sewage rules under an agreement with the Department of Environmental Quality15. A final inspection is mandatory before a permitted Clark County system is covered, and the owner or installer must give at least 48 hours' notice to schedule it16. Only 5.9% of Clark County soils are rated without severe limitations for a conventional septic drain field, so make the site evaluation an early contingency in a land purchase17. A septic permit may be denied where public or central wastewater treatment is reasonably accessible18.

Can you live in an RV or tiny home in Clark County?

We could not confirm a Clark County rule allowing or prohibiting long-term RV occupancy or tiny-home occupancy on private land. Because Clark County has zoning and publishes zoning-district materials, ask Planning & Zoning about the specific parcel, proposed duration, utility connections and whether the unit is treated as a dwelling2612. Do not use Idaho's camping limits for Wildlife Management Areas as an answer for private property: that rule applies to Idaho Fish and Game lands and separate access sites, not ordinary private acreage19. A new manufactured home has a clearer state path: where no approved local building program exists, installation requires a state permit and tag before work starts, followed by inspection and approval before occupancy1011.

Building a home in Clark County: what are the steps?

  1. Call Clark County Planning & Zoning at 208-374-5271 with the parcel number and proposed use; ask for the zoning district, building application, site-plan requirements, floodplain review, access review and current fees12113.
  1. Contact Eastern Idaho Public Health before finalizing the house location so the agency can evaluate the wastewater site and process the septic application514.
  1. Arrange the required electrical, plumbing and HVAC permits through the authority serving the parcel3.
  1. Obtain an Idaho Department of Water Resources drilling permit before drilling a private well, and use an IDWR-licensed well driller8.
  1. If the driveway connects to a state highway, obtain an Idaho Transportation Department encroachment permit for the approach20.
  1. Keep the septic system uncovered until Eastern Idaho Public Health completes its final inspection16.

What should you check before buying land in Clark County?

Start with legal access, zoning and wastewater feasibility rather than assuming a large rural parcel is buildable. Clark County Planning & Zoning can confirm the zoning district and tell you which published applications apply to the parcel6112. Septic suitability deserves special attention because only 5.9% of county soils are rated without severe limitations for a conventional drain field17. Verify water separately: drilling a well requires an IDWR permit before work begins and a licensed well driller8. A driveway onto an Idaho state highway requires an ITD encroachment permit20. Also ask the county whether the site is in a regulated floodplain, because the county publishes a floodplain development application but the available material does not establish the full local trigger1.

Watch-outs

  • A published building application does not by itself answer which Clark County projects require approval; confirm the trigger with Planning & Zoning before work begins112.
  • Most Clark County soils rate as severely limited for a conventional septic drain field, so obtain an onsite evaluation before relying on a proposed homesite1714.
  • County rules for private-land RV living, tiny homes, minimum dwelling size and owner-builders remain unconfirmed; ask Planning & Zoning about the parcel and proposed use2712.

Sources

  1. County Ordinances, quoted and re-checked
  2. Clark County - Contact Us, Planning and Zoning (2026 county census)
  3. Frequently Asked Questions (FAQs) - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
  4. Eastern Idaho Public Health - Septic (2026 county census)
  5. Septic Rules & Forms, quoted and re-checked
  6. County Ordinances, quoted and re-checked
  7. (2026 county census)
  8. Wells Overview (Idaho statewide rule), quoted and re-checked
  9. Idaho Adopted Codes (Idaho statewide rule), quoted and re-checked
  10. Building Archives - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
  11. Building Archives - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
  12. Clark County Planning & Zoning (clark-co.id.gov)
  13. County Ordinances, quoted and re-checked
  14. Eastern Idaho Public Health Environmental Health (eiph.id.gov)
  15. Septic and Septage (Idaho statewide rule), quoted and re-checked
  16. Septic Permit Application Packet, quoted and re-checked
  17. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  18. IDAPA 58.01.03 Individual/Subsurface Sewage Disposal Rules (Idaho statewide rule), quoted and re-checked
  19. Public Use of Department Lands and Access Areas (Idaho statewide rule), quoted and re-checked
  20. Types of Right-of-Way Encroachment Permits (Idaho statewide rule), quoted and re-checked

Written September 27, 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

Clark County in Idaho

44
County map
Clark County highlighted among the Idaho counties · colored by Index score

How Clark County scores

Seclusion84100% ev.
Self-Sufficiency15100% ev.
Admin Boringness5390% ev.
Durability39100% ev.
Property Autonomy90100% ev.
Carry Cost8396% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$262kTypical home
0.3%Property tax
$3,102Land / acre
16.7"Annual rain
15.3% of yrsSevere drought
0.9 / yr (+0.9)Mid-century 100°F days
21.9 daysMid-century dry spell
0.96" (+6%)Mid-century 1-day rain
1.21×Wildfire change factor
100%Forward climate coverage
$1,185Home insurance / yr
5.4% / yrInsurance growth
4.17%Nonrenewal rate
single ZIP shrunk to state medianInsurance basis
79,574People within 2 hr
882Radius comparison (15 mi)
0.5People / sq mi
62.8%Federal land
69.2%Land at 15% slope or less
5.9%Septic soil without severe limits
64,376 acWorkable land screen
21.7%Wooded land
32.9 tonsBiomass / forest ac
40.3°FAvg temp

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Answers from the rulebook for Clark County

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

Clark County rules

  • Zoning districtsPublished

    Clark County zoning-district materials.

    • The county’s official ordinance index lists current zoning districts, but the underlying district map or text was not independently verified.
    “Current Zoning Districts Proposed Zoning Change Planning Area Map”
  • Who permits septicLocal

    Septic services for Clark County residents served by Eastern Idaho Public Health.

    • EIPH serves Clark County and provides septic rules, permit applications, and related forms.
    • State septic rules and technical guidance also apply.
    “Serving Bonneville, Clark, Custer, Fremont, Jefferson, Lemhi, Madison, and Teton Counties”
  • Septic inspectionRequired

    Septic systems installed in Clark County under an EIPH permit.

    • Final inspection by an Environmental Health Specialist is mandatory before covering.
    • The owner or installer must call for final inspection.
    • Systems covered before inspection must be uncovered.
    • EIPH requires 48 hours’ notice to schedule an inspection.

    inspection notice: >= 48 hours

    “Final Inspection Mandatory: It is necessary to have the system inspected by an Environmental Health Specialist prior to covering”
  • Permit feesPublished

    County planning and zoning fee information.

    • The county ordinance index lists a Planning and Zoning Fee Resolution and an updated 2017 fee resolution; the current amounts were not verified in the opened index.
    “Planning & Zoning Fee Resolution [...] Updated Resolution 2017 fees”
  • Permit processPartial

    County planning, zoning, floodplain, building, subdivision, and related permit processes.

    • The official county index lists building, floodplain, subdivision, lot split, variance, zone change, conditional use, and approach permit applications.
    • The index does not provide the complete processing rules or current approval requirements.
    “Building Permit Application-2020 Site Plan Requirements and Example [...] Preliminary Plat Application Subdivision Application Variance Application Zone Change Application Approach Permit Application”
  • County-wide zoningPresent

    Clark County currently lists a Planning and Zoning Administrator. The county ordinance media library was retired, so zoning remains supported at medium rather than high confidence.

    Clark County - Contact Us, Planning and Zoning ↗Scouted from the county site, not yet independently re-checked

Idaho rules that apply here

  • Building permitLimited

    New manufactured-home installations in Idaho locations without an approved local building program.

    • The installation permit and tag are required only for new homes.
    • The requirement applies in areas where there is not an approved local building program.
    • The permit must be obtained before starting installation.
    “An installation permit and installation tag (required only for new homes) is required by Idaho Division of Occupational and Professional Licenses prior to starting the installation in areas where there is not an approved local building program.”
    One more reviewed finding on this topic
  • Building code adoptedAdopted (with conditions)

    Building construction in Idaho subject to the Idaho Building Code Act and the Idaho Division of Occupational and Professional Licenses building-code program.

    • The adopted codes include amendments identified by Idaho; local-government application is subject to the Idaho Building Code Act.
    • The reference to the 2020 Edition is an identifier to the legislative session in which amendments were adopted.
    • Amendments can be made in any legislative cycle regardless of code cycle.
    • The cited DOPL page states that existing rules remain in effect for 2026–2027.

    International Building Code: 2018 edition, with amendments · International Residential Code: 2018 edition, parts I, II, III and IX, with Idaho amendments; collectively named Idaho Residential Code (2020 Edition) · International Energy Conservation Code: 2018 edition, with amendments; collectively named Idaho Energy Conservation Code (2020 Edition) · International Existing Building Code: 2018 edition

    “Building Codes: 2018 International Building Code, with amendments 2018 International Residential Code (parts I, II, III and IX), with Idaho amendments collectively named the Idaho Residential Code (2020 Edition) 2018 International Energy Conservation Code, with amendments collectively named the Idaho Energy Conservation Code (2020 Edition) 2018 International Existing Building Code”
  • 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.”
  • Camping on your landLimited

    Camping or parking a vehicle or trailer on Idaho Fish and Game Wildlife Management Areas and access sites separate from a WMA.

    • The restriction applies in areas posted against camping or parking.
    • Leaving an unattended camp, vehicle, or trailer for more than 48 hours is prohibited without authorization.
    • Camping or parking for more than 10 days during any 30-day period on one WMA or one separate access site is prohibited without authorization.
    • The rule permits authorization by the Commission, Director, Regional Supervisor, or designee.

    unattended duration: > 48 hours (Unless specifically authorized by the Commission, Director, Regional Supervisor, or designee.) · camping or parking duration: > 10 days during any 30-day period per WMA or separate access site (Unless specifically authorized by the Commission, Director, Regional Supervisor, or designee.)

    “camp or park a vehicle or trailer for more than ten (10) days during any thirty (30) day period”
  • Accessory dwellingsLimited

    Accessory dwelling units for Idaho DEQ wastewater-flow and septic-system sizing purposes; this claim does not establish statewide zoning permission.

    • An ADU is sized as a single-family dwelling for the cited wastewater-flow guidance.
    • An ADU may combine flows with another structure into one system.
    • Any common septic tank must be large enough to hold the required capacity from both structures.
    • Local land-use, building, and septic authorities may impose additional requirements.

    wastewater flow basis: single-family dwelling

    “Size as a single family dwelling. Can combine with another structure's flows into one system”
  • 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
    • Limited — Wells drilled in Clark County under Idaho statewide rules.
      “Except as provided in subsection (4) of this section, excavation and opening of wells [...] shall not be subject to permit requirements under section 42-229”
  • Mandatory utility hookupConditional

    Proposed individual or subsurface sewage disposal systems where public or central wastewater treatment facilities may be available.

    • The Director may deny a septic permit when public or central wastewater treatment facilities are reasonably accessible.
    • The cited rule does not establish a universal statewide requirement to connect every property to public sewer.
    • Subsurface septic discharge remains an identified onsite disposal method.
    “Public or central wastewater treatment facilities are reasonably accessible.”
  • Driveway accessRequired

    Private and public driveways or streets connecting to Idaho state highway right-of-way.

    • An ITD encroachment permit is required for private and public approaches, including driveways and streets.
    • No activity may occur on state highway rights-of-way until the Department or a delegated local highway agency issues an approved permit, except emergency approval affecting highway operations and motorist safety may precede processing.
    • A Traffic Impact Study may be required for new or expanded development seeking direct access to a state highway when the stated thresholds are met, unless waived by the District Engineer.

    peak-hour trips for possible TIS requirement: >= 100 new trips (unless waived by the District Engineer) · daily traffic for possible TIS requirement: >= 1000 vehicles per day (unless waived by the District Engineer)

    “Encroachment permits approved by the Department are required for private and public approaches (driveways and streets), utilities and other miscellaneous encroachments.”

Still unanswered

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

  • Owner-builder exemption — Owner-builder exemptions in unincorporated Clark County.
  • Certificate of occupancy — Certificates of occupancy in unincorporated Clark County.
  • Local zoning — Aggregate local zoning across Clark County and incorporated municipalities.
  • Minimum dwelling size — Minimum dwelling size in unincorporated Clark County.
  • Minimum lot size — Minimum lot size in unincorporated Clark County.
10 more unanswered
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Tiny homes
  • Manufactured homes
  • Off-grid sanitation
  • Agricultural exemption
  • Building in a floodplain
  • Short-term rentals

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 Clark County, Idaho

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

Clark County scores 44/100 on the Bolthole Index, a marginal county profile. Its strengths: a stronger property-autonomy legal backdrop and deep seclusion — about 882 people within 15 miles. Watch-outs: thin water margin (16.7″/yr rainfall) and elevated current hazard exposure.

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

Clark County requires a building permit only in limited cases (such as floodplains or specific zones), and it enforces county zoning. Onsite septic is permitted by Eastern Idaho Public Health. 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.

How much does land cost in Clark County, Idaho?

Land in Clark County runs about $3,102 per acre, based on the latest county data.

What is the water situation in Clark County?

Clark County gets about 16.7" of rain a year, with severe drought in roughly 15.3% of years.

How remote is Clark County?

A typical private-land location has about 882 people within 15 miles and 332,881 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Off-grid gear

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

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How Clark compares in Idaho

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