Bolthole Index

Blaine County, Idaho

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

53Index Score / 100
#31 of 44 in Idaho

Unincorporated Blaine County, Idaho requires a building permit before construction begins; excavation counts as the start of construction1. County zoning and overlay districts apply, while Building Services accepts digital plans and South Central Public Health District issues septic permits2,3,4,5.

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

Yes.

Yes. A building permit is required before construction begins in unincorporated Blaine County, and excavation counts as beginning construction1. Blaine County administers an adopted building code for covered construction; specific requirements depend on occupancy and construction type1,7. All county-regulated projects receive zoning review even when no building permit is required7.

One narrow exception applies to qualifying agricultural buildings in the A-20, A-40, R-10 and RR-40 zoning districts: those buildings do not require a building permit when they meet the county definition, but they still need a setback permit through Building Services7. Agricultural buildings outside those districts require building permits7. An exempt agricultural building cannot be used for human habitation, public use, or employment involving the processing, treatment or packaging of agricultural products7.

Who is the Blaine County building department and how do you reach it?

Blaine County Building Services handles building permits and inspections for unincorporated land.

Blaine County Building Services handles building permits and inspections for unincorporated land1. The office accepts digital plans only through the county's OpenGov portal3. Building inspections can be requested at 208-788-5573, extension 1125, and covered projects require a final inspection3,7.

Blaine County Land Use handles zoning review and accepts building and land-use applications electronically11. Septic approval must be obtained before applying for a building permit1. For water, upload a private-well permit or, for municipal or community service, a will-serve letter1. A complete application usually takes 4 weeks during the heavy building season from March through October; incomplete applications take longer7.

Inside city limits, building permits are handled by Hailey12, Ketchum13, Bellevue14, Sun Valley15, Carey16. South Central Public Health District remains the septic-permit authority for Blaine County addresses4.

Does Blaine County, Idaho have zoning?

Yes.

Yes. Blaine County zoning and overlay districts apply in unincorporated Blaine County, with requirements varying by district2. Parcel requirements depend on the applicable zoning district, overlay district and approval procedure2. Blaine County publishes zoning-district information2.

Minimum lot size is district-specific rather than one countywide acreage2,. Blaine County lists an accessory-dwelling-unit conditional-use application; ask Land Use whether an ADU is allowed on the parcel17. Setbacks also vary by district and overlay2. Ask Land Use to identify the district, overlays, minimum lot size and approval path before designing or dividing land11.

County zoning applies to unincorporated land; Hailey18, Bellevue19, Sun Valley20, Carey21 set their own city zoning. Septic permitting stays with South Central Public Health District4.

How do septic permits work in Blaine County?

South Central Public Health District administers septic permitting in Blaine County, and a property owner must obtain a district permit before installing a new or repaired system.

South Central Public Health District administers septic permitting in Blaine County, and a property owner must obtain a district permit before installing a new or repaired system4,5. The district performs site evaluations, sets system-specific requirements and inspects permitted installations5. The Bellevue office handles septic and land-development questions at (208) 788-4335 or septic@phd5.id.gov4.

Off-grid does not mean sanitation is unregulated: Idaho standards govern the design, construction, siting and use of onsite wastewater systems, and alternative systems are limited to designs accepted under state rules5. We could not confirm whether composting toilets, graywater systems or every other non-septic method are allowed, so take a proposed setup to the health district before purchase5. Only about 1.9% of mapped county soils avoid a severe limitation rating for a conventional drain field, making site evaluation an early priority22.

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

We could not confirm a complete countywide rule for long-term RV occupancy or temporary camping on private land in unincorporated Blaine County.

We could not confirm a complete countywide rule for long-term RV occupancy or temporary camping on private land in unincorporated Blaine County. Ask Blaine County Land Use to review the parcel's zoning district, overlays and proposed duration before buying or moving a unit onto the land11. Parcel requirements depend on the applicable district, overlays and approval procedure2.

County meeting minutes say a 150-square-foot home can be acceptable and that the county adopted a tiny-home code section for homes under 400 square feet, but they do not establish a universal minimum dwelling size6. The same minutes say a home must be on a foundation to count as a single-family residence; otherwise it is treated as a trailer or RV6. A separate A-40 rule allows temporary mobile or manufactured-home use during construction for no more than 1 year and permanent primary-residence use on at least 40 acres with builder certification to current county building standards2.

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

Ask Blaine County Land Use to identify the parcel's zoning district and overlays and flag any land-use, ADU or floodplain approvals.

  1. Ask Blaine County Land Use to identify the parcel's zoning district and overlays and flag any land-use, ADU or floodplain approvals1,2,17.
  2. Have South Central Public Health District evaluate the site and issue the required septic approval before the building application1,5.
  3. Document water service with a private-well permit or a municipal or community-water will-serve letter1.
  4. Resolve access if there is no approved driveway: county-road access requires a Blaine County permit, state-highway access requires an ITD permit, and private-road access does not require the listed county permit; wait for approval confirmation before access work1.
  5. Submit the building application and digital plans through OpenGov before construction or excavation begins1.
  6. Schedule the required inspections, including the final inspection, and obtain the certificate of occupancy for covered work7.

What should you check before buying land in Blaine County?

Start with the zoning district, overlays, minimum lot size and legal access, then put septic and water feasibility ahead of house plans.

Start with the zoning district, overlays, minimum lot size and legal access, then put septic and water feasibility ahead of house plans1,2,5. Dividing land triggers county subdivision review, with standards and procedures depending on the application type2. About 42.8% of county land has a slope of 15% or less22.

All development in Blaine County floodplains, including grading, fill and bank stabilization, requires county review; the first floor of living space, mechanical systems and services must be at least 2 feet above mapped flood level23. For budgeting context, the county's effective property-tax rate is about 0.4%, with a median annual property-tax bill of $2,56322.

Watch-outs

  • Do not excavate before the building permit is issued; Blaine County treats excavation as the start of construction1.
  • Use Blaine County’s fee schedule rather than amounts printed on application forms, which may be incorrect; building plan check adds 65% of the building permit fee, and fire-department plan check adds 40% of the plan-check fee24,25.
  • Do not rely on a countywide acreage for minimum lot size; the standard depends on the zoning district, and dividing land triggers subdivision review2.
  • An Idaho owner who works on the owner's own land and does not intend to sell within 12 months may be exempt from contractor registration, but Blaine County building permits, zoning review and inspections still apply when required8.

Sources

25 official pages, each quoted and re-checked · written October 12, 2026

  1. Frequently Asked Questions - Building Services
  2. Blaine County Ordinance No. 2025-08
  3. Blaine County Building Services (blainecountyid.gov)
  4. phd5.idaho.gov
  5. deq.idaho.gov
  6. Blaine County Planning & Zoning Commission Minutes — January 23, 2020
  7. Blaine County Frequently Asked Questions
  8. Frequently Asked Questions (FAQ) - Division of Occupational and Professional Licenses (Idaho statewide rule)
  9. How To Purchase a Trade Permit (Idaho statewide rule)
  10. Idaho Department of Environmental Quality: Wells
  11. Blaine County Land Use (blainecountyid.gov)
  12. Hailey: Building Services (Blaine County)
  13. Ketchum: Ketchum Code of Ordinances, § 15.12.020—Definitions (Blaine County)
  14. Bellevue: 9-1-3: Exemptions (Blaine County)
  15. Sun Valley: 8-4-2: Definitions (Blaine County)
  16. Carey: Do I need a building permit? How do I apply for a permit? (Blaine County)
  17. Blaine County Land Use & Building Services Department 2025 Fee Schedule
  18. Hailey: Hailey, ID Code of Ordinances (Blaine County)
  19. Bellevue: Title 10, Chapter 1: Title; Purpose; Interpretation (Blaine County)
  20. Sun Valley: 9-2-1: Zoning Districts Established (Blaine County)
  21. Carey: Planning and Zoning Regular Meeting 03/06/2023 (Blaine County)
  22. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  23. Floodplain Management & Regulations
  24. Land Use Application Forms
  25. Local Jurisdictional Fees

Written October 12, 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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Compared with neighboring counties

Like all 6 of its neighbors, Blaine County requires a building permit for a home.

RuleBlaine CountyLincoln CountyMinidoka CountyButte CountyJerome CountyCamas CountyGooding County
Building permitRequiredRequiredRequiredRequiredRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsSouth Central Public Health DistrictSouth Central Public Health DistrictSouth Central Public Health DistrictSIPHSouth Central Public Health DistrictSouth Central Public Health DistrictSouth Central Public Health District

County locator

Blaine County in Idaho

53
County map
Blaine County highlighted among the Idaho counties · colored by Index score

How Blaine County scores

53 / 100 · #31 of 44 in Idaho · six factors, land price, tax, rain and climate

Seclusion82100% ev.
Self-Sufficiency29100% ev.
Admin Boringness3890% ev.
Durability36100% ev.
Property Autonomy90100% ev.
Carry Cost68100% 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 →

$1094kTypical home
0.4%Property tax
$3,556Land / acre
18"Annual rain
20.7% of yrsSevere drought
1.6 / yr (+1.6)Mid-century 100°F days
30.8 daysMid-century dry spell
1.12" (+5.5%)Mid-century 1-day rain
1.17×Wildfire change factor
100%Forward climate coverage
$2,482Home insurance / yr
2.8% / yrInsurance growth
1.19%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
5,000People within 30 min
207,022People within 2 hr
5,649Radius comparison (15 mi)
9.5People / sq mi
80.5%Federal land
42.8%Land at 15% slope or less
1.9%Soils rated "not limited" for septic (strict USDA rating)
25,662 acWorkable land screen
21.8%Wooded land
30.5 tonsBiomass / forest ac
42.6°FAvg temp

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Cities and towns in Blaine County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Answers from the rulebook for Blaine County

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

Blaine County rules

  • Building permitRequired

    Projects subject to Blaine County building-permit review, including new construction and listed alterations.

    • Agricultural buildings in A-20, A-40, R-10, and RR-40 may not require a building permit but require a setback permit if they meet the county definition; agricultural buildings outside those districts require building permits.
    • Payment is required before commencement of construction.
    • All building permit applications receive fire district, zoning, and building department approval before permit issuance.
    “A BUILDING PERMIT MUST BE OBTAINED PRIOR TO COMMENCEMENT OF CONSTRUCTION; EXCAVATION CONSTITUTES START OF CONSTRUCTION.”
    One more reviewed finding on this topic
  • Building code adoptedAdopted (with conditions)

    Blaine County building and fire code administration.

    • The county page lists a 2018 Building Code and a 2018 Fire Code ordinance; specific project requirements may depend on occupancy and construction type.
    “Refer to Section Chapter 16) of the 2018 IBC amended by Blaine County Code”
    One more reviewed finding on this topic
    • Adopted (with conditions) — County building-code administration for covered construction.
      “Because the 2012 International Building Code requires final inspections and certificates of occupancy”
  • InspectionsRequired

    Projects for which the county requires final inspection.

    • The final-inspection deposit is released only after successful final inspection and issuance of a certificate of occupancy.

    final inspection deposit: >= 1500 USD (Or 10% of total permit fees, whichever is greater.)

    “Deposits for final inspection shall be released to the depositor upon successful final inspection and issuance of a Certificate of Occupancy.”
  • Certificate of occupancyRequired

    Projects subject to the county's final-inspection deposit requirement.

    • Deposit release is contingent on successful final inspection and issuance of the certificate of occupancy.
    “Deposits for final inspection shall be released to the depositor upon successful final inspection and issuance of a Certificate of Occupancy.”
  • County-wide zoningPresent (with conditions)

    Blaine County zoning regulations and zoning districts.

    • County zoning provisions vary by district and may be supplemented by overlay districts and conditional-use requirements.
    “MISCELLANEOUS AMENDMENTS TO TITLE 9, ZONING REGULATIONS, AND TITLE 10, SUBDIVISION REGULATIONS”
    One more reviewed finding on this topic
    • Present (with conditions) — County zoning regulations in unincorporated Blaine County.
      “SECTION 4. CHAPTER 5 PRODUCTIVE AGRICULTURAL DISTRICT (A-20)”
  • Local zoningPresent (with conditions)

    Blaine County-administered zoning regulations and zoning districts, including Title 9 regulations applicable to county-regulated land.

    • The ordinance establishes county zoning regulations and districts; incorporated municipalities may administer separate municipal zoning rules.
    • Specific uses and development standards depend on the applicable zoning district, overlay district, and approval procedures.
    “An Ordinance of Blaine County, Idaho, amending Title 9, Zoning Regulations”
    One more reviewed finding on this topic
    • Present (with conditions) — Land-use development in Blaine County subject to the county's zoning review.
      “All projects are subject to a zoning review, even if a building permit is not required and if you are outside your building envelope.”
  • Zoning districtsPublished

    Blaine County zoning-district information and maps.

    • The county GIS service is for reference and the county disclaims responsibility for inaccuracies; parcel-specific confirmation may be needed.
    “Chapter 4, Zoning Districts and Their Base Densities, Overlay Districts and Boundaries”
    One more reviewed finding on this topic
  • Minimum dwelling sizeSpecified

    Tiny homes and small residential structures reviewed under Blaine County building-code standards.

    • The official minutes record the Building Official's statement that a 150-square-foot home is acceptable; the excerpt does not expressly state that 150 square feet is a universal minimum for every dwelling type.
    • The Building Official stated that the county adopted a new tiny-home building-code section for homes under 400 square feet.
    • The minutes state that a home must be on a foundation to be considered a single-family residence; otherwise it is treated as a trailer or RV.

    accepted home size reference: 150 square feet (The source says a 150 square foot home is acceptable; it does not expressly label this number as a universal minimum.) · tiny-home code threshold: < 400 square feet (The minutes state the county adopted its tiny-home section for homes under 400 square feet.)

    “the Building Code says a 150 square foot home is acceptable.”
  • Minimum lot sizeDistrict specific (with conditions)

    County-regulated parcels subject to Blaine County zoning districts and subdivision rules.

    • The applicable minimum lot size is determined by the zoning district governing the parcel.
    • The ordinance provision concerns modification of an original parcel and requires administrative findings regarding floodplain, riparian, mountain, wetlands, and other overlay districts.
    • Parcels must be completely within the A-20 or A-40 zoning district, or each parcel must be at least four acres or larger, and neither parcel may become more nonconforming in size to the applicable district minimum lot size.
    • The cited official ordinance does not provide the complete numeric minimum-lot-size table for every zoning district.

    minimum parcel size alternative in original-parcel modification: >= 4 acres (Applies where the parcel is not completely within the A-20 or A-40 zoning district or both, subject to the other subsection conditions.)

    “Neither parcel will become any more nonconforming in size to the minimum lot size set out in the applicable zoning district.”
  • SetbacksDistrict specific (with conditions)

    County zoning and overlay districts.

    • The ordinance includes a manufactured-home park overlay dimensional standard; additional district standards were not extracted.

    street corner lot setback: 50 feet (From exterior property line in the Mobile Home/Manufactured Home Park Overlay District.)

    “C. Street Corner Lot Setback (From Exterior Property Line): Fifty feet (50') from corner.”
  • Tiny homesLimited

    Tiny homes on wheels as accessory dwellings on residential lots in unincorporated Blaine County

    • Permitted use on lots of 2 to <5 acres (one unit) and 5+ acres (one unit); second unit on 5+ acres by conditional use permit
    • Lots 1 to <2 acres and lots under 1 acre (only on DEQ-regulated community or municipal water system, with will-serve letter) require a conditional use permit and South Central Public Health District approval
    • Must be on same lot as principal dwelling, connected to its water/wastewater, licensed with Idaho DMV, ANSI A119.5 and NOAH ANSI+ certified, wheels not removed
    • Allowed only in A-20, A-40, R-10, RR-40, R-5, R-2 1/2, R-2, R-1, R-.4, R-1/4 and RD districts, not in designated overlay districts (with listed exceptions)
    • Zoning approval terminates in five years, renewable; tiny home on wheels permit required
    • Sunset: tiny home on wheels provisions effective 5/17/2022 until 5/17/2027 unless re-adopted
    • Applies to unincorporated areas; cities have their own rules

    minimum tiny home size: >= 150 square feet · maximum tiny home size: <= 400 square feet · zoning approval term: 5 years (renewable if standards met)

    “on lots of two (2) acres to less than five (5) acres in size, one accessory dwelling unit or one tiny home on wheels shall be a permitted use.”
  • Manufactured homesLimited

    Permanent or temporary mobile/manufactured-home occupancy in specified Blaine County zoning districts.

    • A-40 permits temporary use during construction for no more than one year.
    • Permanent primary-residence use in A-40 requires a parcel of at least 40 acres and builder certification to current county building standards.
    • Other district-specific rules and setbacks may apply.

    minimum parcel area: >= 40 acres (A-40 permanent primary residence) · temporary construction duration: <= 1 year (A-40 temporary use during construction)

    “Permanent use of a mobile home/manufactured home as a primary residence on a parcel of land at least forty (40) acres lying within the district”
  • Accessory dwellingsLimited

    Accessory dwelling units in Blaine County.

    • The county fee schedule lists an ADU conditional-use-permit application.

    ADU conditional use permit fee: 1200 USD

    “Accessory Dwelling Units (ADU) Conditional Use Permit $1,200.00”
  • Who permits septicLocal

    Blaine County onsite wastewater systems administered by South Central Public Health District.

    • South Central Public Health District serves Blaine County and administers septic permitting under Idaho’s public-health framework.
    “South Central Public Health District serves Blaine, Camas, Cassia, Gooding, Jerome, Lincoln, Minidoka, and Twin Falls counties.”
    One more reviewed finding on this topic
    • Local (with conditions) — Septic matters in Blaine County served by South Central Public Health District.
      “South Central Public Health District serves Blaine, Camas, Cassia, Gooding, Jerome, Lincoln, Minidoka, and Twin Falls counties.”
  • Septic permitRequired

    New and repaired subsurface sewage disposal systems in Blaine County.

    • The public health district performs site evaluations and issues permits; system-specific requirements vary by system type and site.
    “To have a septic system installed, the property owner must obtain a permit from a public health district.”
    One more reviewed finding on this topic
    • Required — New and repaired subsurface sewage disposal systems in Blaine County.
      “Environmental Health Specialists review applications and issue permits for new and repaired subsurface sewage disposal systems (septic tanks).”
  • Septic inspectionRequired

    Permitted septic installations in Blaine County.

    • Individual systems are inspected by the public health district after installation.
    • Large soil absorption systems are inspected by the public health district and DEQ.
    “Once the permit has been issued, the system should be installed by a licensed installer and inspected by the public health district.”
  • Mandatory utility hookupConditional

    Building-permit submittals in Blaine County where water service or onsite water supply is proposed.

    • For municipal or community water systems, upload a will-serve letter; otherwise upload an Idaho Department of Water Resources well permit.
    • Septic approval is required before applying for a building permit.
    “For locations connected to a municipal or community water system, upload a will-serve letter at the time of permit submittal.”
    One more reviewed finding on this topic
    • Conditional — Building-permit applications requiring domestic water service in unincorporated Blaine County.
      “Idaho Department of Water Resources: Upload well permit (this can be accepted as a deferred submittal). For locations connected to a municipal or community water system, upload a will-serve letter at the time of permit submittal.”
  • Agricultural exemptionConditional

    Agricultural buildings in A-20, A-40, R-10, and RR-40 zoning districts.

    • A setback permit is required.
    • The structure must meet the county definition of agricultural building.
    • It may not be for human habitation, employment where agricultural products are processed, treated, or packaged, or public use.
    • Agricultural buildings outside those named districts require building permits.
    “No, they do not require a building permit, but do require a setback permit obtained through the building department if the agricultural building is located in an agricultural zoning district (A-20, A-40, R-10, and RR-40 in Blaine County) and they meet the definition contained in the Blaine County Building Code”
  • Subdividing landRegulated (with conditions)

    Subdivision and planned-unit-development applications in Blaine County.

    • The county publishes subdivision and planned-unit-development application materials and administers Title 10 subdivision regulations.
    • Specific standards, plat contents, and review procedures depend on the application type.
    “MISCELLANEOUS AMENDMENTS TO TITLE 9, ZONING REGULATIONS, AND TITLE 10, SUBDIVISION REGULATIONS”
    One more reviewed finding on this topic
    • Regulated (with conditions) — Subdivision, plat, and planned-unit-development applications in Blaine County.
      “Regular or Mobile/Manufactured Home Subdivision or PUD for each of the first 10 development lot, dwelling unit or leased site proposed. ($175.00 thereafter for each). $1,600.00 for first 10 plus $200.00 per lot.”
  • Driveway accessRequired

    Access from county roads or state highways for development in Blaine County.

    • If approved existing access does not exist, an access or encroachment permit must be obtained.
    • Private-road access does not require the county access permit.
    • County-road access uses a Blaine County permit; state-highway access uses an ITD encroachment permit.
    • Work is not allowed until approval confirmation is received.
    “Road access/encroachment permit - if there is not approved existing access, a permit must be obtained. If the property is accessed from a private road, a permit is not required.”
    One more reviewed finding on this topic
    • Limited — Access to building sites in unincorporated Blaine County.
      “Road access/encroachment permit - if there is not approved existing access, a permit must be obtained. If the property is accessed from a private road, a permit is not required. For access from a County Road, Blaine County Approach & Encroachment permit., for access from a State Highway, ITD Encroachment Permit.”
  • Building in a floodplainLimited

    Development in Blaine County floodplain overlay areas.

    • Floodplain properties receive zoning review before permit issuance.
    • The county checklist recommends a zoning pre-review for properties in overlay districts including Floodplain.
    • The 2025 county fee schedule lists a Floodplain Conditional Use Permit.

    floodplain conditional use permit fee: 1200 USD (2025 proposed fee schedule; current fee shown as $750)

    “For properties located in Overlay Districts, such as Floodplain, Mountain Overlay, etc., it is recommended to have a zoning pre-review conducted.”
    One more reviewed finding on this topic
    • Required — Development within Blaine County floodplain and riparian overlay areas.
      “All development within the floodplain, including but not limited to grading, cut and fill, installation of riprap, and other bank stabilization techniques, requires review from this office.”
  • Permit feesVariable (with conditions)

    Blaine County land-use and building-permit fees.

    • The Land Use Application Fee Schedule is effective July 1, 2025.
    • Application forms may contain incorrect fees; the county directs applicants to use the Fee Schedule for current amounts.
    • For building projects valued at $200,000 or more, a $1,500 non-refundable partial payment is required after the application is deemed complete.

    large-project partial payment: 1500 USD (projects with valuation of $200,000 or greater)

    “Application forms are actively being updated; some fees contained within the application forms may be incorrect. Please refer to the Fee Schedule for correct fee amounts.”
    One more reviewed finding on this topic
    • Published — Blaine County building permit fees and related charges.
      “additional 65% of the Building Permit Fee shall be paid as Plan Check Fee”
  • Permit processPublished (with conditions)

    Blaine County building and land-use permit applications.

    • Building and land-use applications are submitted through the county’s online/OpenGov process.
    • Building applications require zoning, fire-district, and building-department approval before issuance.
    • Septic approval must be obtained directly from SCPHD before applying for a building permit.
    • Applications may require site plans, building plans, energy-code information, road-access permits, and well permits or will-serve letters.
    “Building Permit & Ag-Setback permit applications shall be submitted online.”
    One more reviewed finding on this topic
    • Published (with conditions) — County building-permit applications.
      “From the time you drop off your completed permit application, the process time is usually four weeks during the heavy building season from March through October.”

Idaho rules that apply here

  • Owner-builder exemptionConditional

    Homeowners personally performing plumbing work on their own residential premises in Idaho.

    • The homeowner must own the residential property and personally perform the permitted work.
    • The homeowner permit is valid only for a primary or secondary residence and associated outbuildings.
    • Associated outbuildings must not be used for commercial purposes or rented by a tenant.
    • The homeowner must accept responsibility for all work performed.
    • All work must be inspected by the Division of Occupational and Professional Licensing.
    • A plumbing permit must be obtained by application to the Division.
    • The application must be submitted with payment.
    • The application form states that an additional $65 fee may be assessed if the location is not clearly provided by directions or an attached map.
    • The application was revised 8/17/2022; this revision date is not treated as an effective date.

    unclear-location fee: 65 USD (May be assessed if the location is not clearly given by directions or an attached map.)

    “I certify that I am the owner of the residential property and will personally perform the work covered by this permit.”
    5 more reviewed findings on this topic
    • Available (with conditions) — An owner performing construction work on the owner's own land under Idaho's contractor-registration requirements.
      “Owners: Owners who do their own work on their own land and do not intend to sell the property within 12 months are exempt from registration.”
    • Available — An owner performing their own construction work on the owner's own land in Idaho.
      “A: Any person who engages in a construction job with a dollar amount exceeding $2000.00 (materials & labor) and is not otherwise exempt (The exemptions are listed below); [...] Owners: Owners who do their own work on their own land and do not intend to sell the property within 12 months are exempt from registration.”
    • Conditional — An Idaho homeowner undertaking construction or trade work for which a state-administered permit process applies.
      “Public (Homeowners Only) [...] *Public: “Homeowner” is pre-selected. [...] Once payment is processed, you may choose “Request Inspection” and/or “Print Permit””
    • Conditional — Owners performing construction work on their own land in Idaho under the state contractor-registration system.
      “Owners who do their own work on their own land and do not intend to sell the property within 12 months are exempt from registration.”
    • Conditional — Homeowners personally performing electrical work on a primary or secondary residence and related outbuildings in Idaho.
      “Homeowners may purchase a permit only when they themselves are doing electrical work on their primary or secondary residence and/or related outbuildings.”
  • 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”
  • Off-grid sanitationLimited

    Installing, modifying, repairing or expanding individual or subsurface sewage disposal systems (septic) anywhere in Idaho, including off-grid homes

    • A valid installation permit is required before any person modifies, repairs, expands or installs an individual or subsurface sewage disposal system, except as listed in subsection 005.02.
    • Exceptions (005.02): portable nondischarging systems may be installed as temporary blackwaste or wastewater systems if properly maintained and of a design approved by the director; repairs for clogged or broken solid piping or electrical/mechanical malfunctions are allowed without a permit, but repairs may not expand the system unless authorized by the director.
    • Excepted activities remain subject to all other relevant rules and regulations.
    • Where this rule conflicts with state or local zoning, building, fire, safety or health regulation, the provision that in the director's judgment sets the higher health and safety standard prevails.
    • Permit becomes invalid if construction is not completed and approved within two years of issuance unless otherwise stated; may be renewed at director's discretion.
    • Director may deny where public or central wastewater treatment facilities are reasonably accessible.
    • Permit fee is set under IDAPA 58.01.14.
    • Rules are administered through the health districts under DEQ; the director may require operation, maintenance and monitoring conditions in the permit.

    installation permit validity: 2 years (unless otherwise stated on the application or permit; renewable at director's discretion)

    “01. permit required. 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
    • Limited — On-site or non-central wastewater sanitation serving homes and buildings in Blaine County under Idaho statewide wastewater rules.
      “Idaho’s Individual/Subsurface Sewage Disposal Rules (IDAPA 58.01.03) establish minimum standards for the design, construction, siting, and use of onsite wastewater systems.”
  • 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, construction, modification, abandonment, or closure of wells serving Blaine County properties.
      “Idaho law requires all well drillers to be licensed and obtain a permit before drilling.”
  • Shed and accessory-building permit exemptionAvailable (with conditions)

    One-story detached accessory structures regulated under the state-adopted 2018 Idaho Residential Code for one- and two-family dwellings.

    • The Idaho Building Code Board's current rule adopts the 2018 International Residential Code, Parts I, II, III, and IX, with Idaho amendments, for one- and two-family dwellings.
    • The cited exemption is from the residential-code building-permit requirement; it does not itself authorize work that violates local land-use, zoning, utility, trade-permit, or other requirements.
    • Building-code and placement-site jurisdiction may be exercised by the applicable city or county.

    maximum floor area for one-story detached accessory structure permit exemption: <= 200 square feet (Applies to the residential-code exemption for one-story detached accessory structures.)

    “One-story detached accessory structures, provided that the floor area does not exceed 200 square feet.”
  • Campground & park staysLimited

    Temporary camping in Idaho State Parks administered by the Idaho Department of Parks and Recreation.

    • Camping is permitted only in designated areas.
    • Stays are limited to 14 nights in a 30-day period; the same page's FAQ separately states a 15-day limit, creating an unresolved internal discrepancy.
    • Individual-site occupancy is limited to one family unit or no more than 8 persons unless otherwise specified; companion-site and site-design restrictions apply.
    • Camping is not permitted on beaches, parking lots, or day-use facilities.
    • Check-in is at 2 p.m. for campsites and checkout is at 1 p.m.; late checkouts may incur additional fees unless prior arrangements have been made.

    state-park stay limit: 14 nights in 30 days (FAQ on the same page states 15 days in any 30-day period) · individual-site people limit: <= 8 people (one family unit or site-specific limits may apply)

    “Camping is permitted only in designated areas. [...] Stays are limited to 14 nights in a 30-day period.”
  • county zoning authorityGeneral

    Idaho counties adopting zoning for unincorporated areas through their boards of county commissioners.

    • A board of county commissioners is a governing board and may exercise the powers authorized by the Local Land Use Planning Act.
    • The county board's powers under the chapter apply to the unincorporated area of the county.
    • Zoning must be adopted, amended, or repealed by ordinance using the notice and hearing procedures in Idaho Code § 67-6509.
    • Zoning districts must conform to the adopted comprehensive plan.
    • Within zoning districts, standards may regulate or restrict building height, number of stories, size, construction, reconstruction, alteration, repair or use of buildings and structures; lot occupancy; courts, yards and open spaces; population density; and building and structure location and use.
    • Standards must be uniform for each class or kind of building throughout each district, but may differ between districts.
    • Overlay zoning districts require clear and objective standards and must not constitute a regulatory taking under Idaho or federal law.
    “The powers of the board of county commissioners conferred by this chapter shall apply to the unincorporated area of the county.”
  • county building authorityGeneral

    Idaho counties' authority to adopt and enforce building codes and require permits for residential construction in unincorporated areas when the county operates a building-code enforcement program.

    • The statute defines local government as any city or county of Idaho.
    • A local government that had not previously implemented a code-enforcement program may elect to implement one by ordinance evidencing its intent to do so.
    • Construction in a local-government jurisdiction enforcing building codes requires a permit under the applicable local ordinance.
    • A local government issuing permits and performing enforcement must adopt the specified state-adopted codes and may amend them only within the limits stated in Idaho Code § 39-4116(4).
    • Local amendments must generally provide at least an equivalent level of protection; accessibility amendments are restricted, and additional residential-code amendments require the statutory good-cause, necessity, ordinance, public-hearing, publication, and notice procedures.
    • Single-family homes and multiple-family dwellings up to two units are exempt from automatic fire-sprinkler requirements in the enumerated codes.
    • Agricultural buildings must be exempted; a county may issue farm-building permits only for road setbacks and utility easements, at no more than actual issuance cost.
    • Permits are governed by the laws in effect when the application is received.
    • The state division retains jurisdiction for in-plant inspections and installation standards for manufactured or mobile homes and for in-plant inspections and enforcement of modular-building and commercial-coach construction standards.
    “"Local government" means any city or county of this state.”

Still unanswered

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

  • Lot coverage — Lot coverage under county zoning.
  • Building height — Building height under county zoning.
  • Living in an RV — Long-term or residential occupancy of recreational vehicles on private land in Blaine County, Idaho.
  • Short-term rentals — Short-term rentals in Blaine 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.

Water rights & wells in Blaine County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Idaho’s water agency.

Over-appropriated / declining

The aquifer here is over-appropriated and declining. A domestic well is usually still permit-exempt, but long-term supply is a genuine risk.

Household wellExempt — no permit or water right

Groundwater for domestic purposes up to 13,000 gpd is exempt from permitting; critical-area and moratorium closures generally target new PERMITTED (non-exempt) appropriations, so a household can still drill a domestic-exempt well even inside a critical groundwater area.

Limit: 13,000 gpd (homes, stockwater, irrigation of ≤0.5 acre) under Idaho Code 42-227

Idaho Dept of Water Resources — Domestic Exemption ↗
  • Eastern Snake Plain Aquifer (ESPA) Ground Water Management Areamajority of county

    Designated a GWMA (2016); the Snake River Basin Moratorium (2022, amended 2024) bars new/pending permit applications above Swan Falls Dam, effectively closing new appropriative groundwater rights — domestic-exempt wells excepted.

    Idaho Dept of Water Resources — ESPA GWMA Order ↗
  • Big Wood River Ground Water Management Areapartial of county

    GWMA since 1991; a 2022 moratorium (amended 2024) bars processing new/pending applications to appropriate ground water within the area; domestic-exempt wells excepted.

    Idaho Dept of Water Resources — Big Wood River GWMA Moratorium ↗

Prior-appropriation state (first in time, first in right). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Idaho state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Blaine County, Idaho

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

Blaine County scores 53/100 on the Bolthole Index, a solid county profile. Its strengths: a stronger property-autonomy legal backdrop and sparse surroundings — about 5,000 people within a 30-minute drive. Watch-outs: thin water margin (18″/yr rainfall) and elevated current hazard exposure.

How much does land cost in Blaine County, Idaho?

Land in Blaine County runs about $3,556 per acre, based on the latest county data.

What is the water situation in Blaine County?

Blaine County gets about 18" of rain a year, with severe drought in roughly 20.7% of years. On water rights, Blaine County lies in the Eastern Snake Plain Aquifer (ESPA) Ground Water Management Area — Designated a GWMA (2016); the Snake River Basin Moratorium (2022, amended 2024) bars new/pending permit applications above Swan Falls Dam, effectively closing new appropriative groundwater rights — domestic-exempt wells excepted..

How remote is Blaine County?

A representative private-land location has about 5,000 people within a 30-minute drive and 207,022 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Blaine compares in Idaho

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