Bolthole Index

Fremont County, Idaho

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

64Index Score / 100
#16 of 44 in Idaho

Unincorporated Fremont County, Idaho requires building permits for construction and structural modifications, with specific exemptions1. County zoning applies to unincorporated land; Newdale has its own building-permit and zoning rules234. Eastern Idaho Public Health issues septic permits, and a new individual septic system needs its permit before the county building application is submitted56.

At a glance

Building permit
Required for unincorporated construction and structural modifications, with specific exemptions17
Zoning
Yes; zoning districts cover unincorporated Fremont County28
Septic permit
Eastern Idaho Public Health; a new individual system needs septic approval at building-application submittal96
Minimum lot size
Varies by zoning district; Rural Living lists a 1-acre minimum10
RV living
An RV cannot be used as a dwelling; one temporary RV may be allowed while an approved home is built1112
Tiny-home occupancy
Not confirmed; ask Planning and Building before choosing a structure1314
Owner-builder exemption
Contractor-registration exemption for owners doing their own work without intending to sell within 12 months; building permits still apply15
Well permit
An Idaho Department of Water Resources drilling permit is required before drilling16

Who to call

Building permits

Fremont County Building Department

Building permits, plan review and building-code administration outside St. Anthony city limits

208-624-7200

Fremont County Courthouse, 151 W 1st North, St. Anthony, ID 83445

Planning & zoning

Fremont County Planning Department

Zoning, land-use permits, subdivision review and Planning and Zoning Commission matters

208-624-7200

Fremont County Courthouse, 151 W 1st North, St. Anthony, ID 83445

Health department

Eastern Idaho Public Health, Fremont County Office

Local contact for septic and land-development questions in Fremont County

(208) 522-8065

45 South 2nd West, St. Anthony, ID 83445

Roads & driveways

Fremont County Road & Bridge

County-road access and county right-of-way permits

208-624-7200

135 North Bridge, Suite B, St. Anthony, ID 83445

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

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

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

Unincorporated Fremont County requires building permits for construction, reconstruction and structural modifications, with specified exemptions1. A qualifying one-story detached accessory structure may be exempt when it is no larger than 200 square feet, non-habitable, without plumbing or electricity, and more than 3 feet from another structure1. Fremont County has adopted building, residential, energy, mechanical and fuel-gas codes for county-administered work17. Agricultural buildings that meet the code definition are exempt from the adopted building codes, but still need applicable zoning placement permits7. An owner working on the owner's own Idaho land may be exempt from contractor registration when the owner does not intend to sell within 12 months, but that exemption does not waive building permits or inspections15. Electrical, plumbing and HVAC work requires separate trade permits where subject to the state-administered program18.

Who issues Fremont County building permits, and how do you reach them?

The Fremont County Building Department administers county building-code requirements outside St. Anthony city limits19. In Newdale, the city has its own building-permit requirements; Eastern Idaho Public Health remains the septic authority serving Fremont County39. The county Building Department publishes the Fremont County Courthouse at 151 W 1st North in St. Anthony, phone 208-624-7200, as its contact14. County Planning uses the same courthouse contact for land-use applications13. Ask Building about plans and inspections; county-administered projects receive occupancy approval after final inspection20. Building fees depend on square footage and construction type, with a deposit due at application submittal21.

Does Fremont County have zoning?

Unincorporated Fremont County has zoning districts and an official zoning map governing uses and dimensional standards222. Newdale enforces its own zoning; septic permitting stays with Eastern Idaho Public Health45. Rural Living lists a 1-acre minimum lot, while rural tables generally require 50-foot setbacks from arterials, collectors or section-line streets, 30 feet from other roads and 25 feet from property lines not fronting a road1023. Coverage limits vary: rural tables require a special-use permit above 14,000 square feet, and residential tables above 25,000 square feet, alongside applicable percentage limits2425. Single-family buildings generally have a 30-foot height limit and accessory structures 25 feet; a special-use permit may be requested to exceed applicable limits26. We could not confirm a minimum dwelling size or complete accessory-dwelling rule; ask County Planning before designing on unincorporated land13.

How do septic permits work in Fremont County?

Eastern Idaho Public Health administers onsite sewage permitting for Fremont County5. A septic permit is required to construct, modify or repair an individual sewage disposal system, subject to limited exceptions27. For a new individual septic system, the septic permit must accompany the county building-permit application6. The local contact is the Eastern Idaho Public Health Fremont County Office at 45 South 2nd West in St. Anthony, phone (208) 522-806528. The tank and drainfield must be inspected before covering, and Eastern Idaho Public Health requires 48 hours' notice; a covered system must be uncovered for inspection29. Only 11.5% of county soils are rated without severe limitations for a conventional drain field, so obtain the site evaluation early30. Where community sewer is available in the Island Park/Mack's or Last Chance/Pond's service areas, the $7,458 hook-up fee must be paid before the building permit31.

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

Unincorporated Fremont County prohibits using an RV or travel trailer as a single-family dwelling11. During construction of a permitted home, a temporary certificate may allow 1 RV after an approved sewage system is installed and connected; the certificate lasts no more than 180 calendar days, expires with the home permit, and requires RV removal before completed-home occupancy approval12. Personal camping on your own property is excluded from the code’s campground definition, whose temporary stays are generally 15 days or less; that definition does not authorize RV dwelling use3211. Regulated RV parks have separate occupancy and sanitation standards33. The Floodplain Overlay District separately prohibits residential use of RVs or similar trailers left in place for 180 or more consecutive days34. We could not confirm tiny-home occupancy rules; ask Planning and Building how the proposed structure is classified1314.

What are the steps to build a home in unincorporated Fremont County?

  1. Ask Planning to identify the zoning district, allowed use, setbacks, height and land-use approval path222326.
  2. Confirm access: all new builds off county roads need a driveway permit through County Public Works, while a state-highway approach goes through the Idaho Transportation Department35.
  3. Determine whether the named community sewer systems serve the building; otherwise obtain the Eastern Idaho Public Health septic permit before submitting the building application316.
  4. Obtain an Idaho Department of Water Resources drilling permit and use a licensed driller for a new well16.
  5. Submit a complete application, site plan, supporting plans and deposit to Fremont County Building for unincorporated construction; review may take approximately 4 to 6 weeks3621. The county also publishes a separate sewer-connection sequence, with up to 14 days for supervisor review37.
  6. Obtain required trade permits and complete septic and building inspections before occupancy182920.

What should you check before buying land in Fremont County?

Start with zoning and division history because Fremont County regulates short plats, standard subdivisions and land divisions38. Confirm the district's lot standard and allowed use on the official zoning map before treating a listing as buildable1022. Development in the mapped Floodplain Overlay District requires a county permit; stream and lakeshore corridors also require Class I approval for activities such as clearing, grading, fill and accessory buildings, unless reviewed through a Class II application3940. Verify whether access is private, county or state maintained; a building permit does not mean the county will maintain the road to the property35. The effective property-tax rate is about 0.5%, and the median annual property-tax bill is about $1,3604142.

Watch-outs

  • Building permits inside St. Anthony city limits are not administered by Fremont County, so verify jurisdiction before filing43.
  • Published building fees vary by square footage and construction type, and the county requires a deposit with the application44.
  • Fremont County cannot require a license, fee, permit, certification or registration before a dwelling is rented short term; the published code’s rental-permit language conflicts with that limitation, so ask Planning about applicable zoning and safety standards4546.
  • Personal camping on your own property does not establish permission to use an RV as a dwelling in unincorporated Fremont County3211.
  • A new access onto a county road needs a permit before work begins47.

Sources

  1. Fremont County Development Code, quoted and re-checked
  2. Fremont County Development Code, quoted and re-checked
  3. Newdale: Do I need a Building Permit? (Fremont County), quoted and re-checked
  4. Newdale: Newdale municipal code index (Fremont County), quoted and re-checked
  5. Septic | Eastern Idaho Public Health, quoted and re-checked
  6. Pre-Construction Checklist for Building Permits, quoted and re-checked
  7. Ordinance adopting latest version of International Building Code, quoted and re-checked
  8. Fremont County Development Code, quoted and re-checked
  9. Septic | Eastern Idaho Public Health, quoted and re-checked
  10. Fremont County Development Code, quoted and re-checked
  11. Fremont County Development Code — revisions as of February 2026, quoted and re-checked
  12. Fremont County Development Code – 2011 Edition, quoted and re-checked
  13. Fremont County Planning Department (fremontcountyid.gov)
  14. Fremont County Building Department (fremontcountyid.gov)
  15. Frequently Asked Questions (FAQ) – Idaho Division of Occupational and Professional Licenses, quoted and re-checked
  16. Wells Overview, quoted and re-checked
  17. Building | Fremont County, ID, quoted and re-checked
  18. Frequently Asked Questions (FAQs) - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
  19. Building, quoted and re-checked
  20. Pre-Construction Checklist for Building Permits, quoted and re-checked
  21. Pre-Construction Checklist for Building Permits, quoted and re-checked
  22. Fremont County Development Code, quoted and re-checked
  23. fremontcountyid.gov, quoted and re-checked
  24. fremontcountyid.gov, quoted and re-checked
  25. Fremont County Development Code, quoted and re-checked
  26. Pre-Construction Checklist for Building Permits, quoted and re-checked
  27. Septic | Eastern Idaho Public Health, quoted and re-checked
  28. Eastern Idaho Public Health, Fremont County Office (eiph.id.gov)
  29. Septic Permit Information Sheet, quoted and re-checked
  30. 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
  31. Pre-Construction Checklist for Building Permits, quoted and re-checked
  32. Fremont County Development Code — campground and temporary-use provisions, quoted and re-checked
  33. Fremont County Development Code – 2011 Edition, with revisions as of February 2026, quoted and re-checked
  34. Fremont County Development Code – 2011 Edition, with revisions as of February 2026, quoted and re-checked
  35. Pre-Construction Checklist for Building Permits, quoted and re-checked
  36. Pre-Construction Checklist for Building Permits, quoted and re-checked
  37. Planning | Fremont County, ID, quoted and re-checked
  38. Fremont County Development Code – 2011 Edition, revisions as of February 2026, quoted and re-checked
  39. Fremont County Development Code – 2011 Edition, revisions as of February 2026, quoted and re-checked
  40. Fremont County Development Code, quoted and re-checked
  41. Effective property tax rate: Bolthole Index county data
  42. Median property tax bill: Bolthole Index county data
  43. Building, quoted and re-checked
  44. Planning and Building Department Fee Schedule, quoted and re-checked
  45. Planning | Fremont County, ID, quoted and re-checked
  46. Planning | Fremont County, ID, quoted and re-checked
  47. Fremont County Road & Bridge (fremontcountyid.gov)

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, Fremont County has countywide zoning.

RuleFremont CountyMadison CountyTeton CountyClark CountyJefferson CountyBonneville CountyBingham County
Building permitRequiredRequiredRequiredLimitedRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsEastern Idaho Public HealthEIPHEastern Idaho Public HealthEastern Idaho Public HealthEastern Idaho Public HealthEIPHSoutheastern Idaho Public Health

County locator

Fremont County in Idaho

64
County map
Fremont County highlighted among the Idaho counties · colored by Index score

How Fremont County scores

Seclusion85100% ev.
Self-Sufficiency41100% ev.
Admin Boringness3890% ev.
Durability46100% ev.
Property Autonomy90100% ev.
Carry Cost73100% 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 →

$483kTypical home
0.5%Property tax
$4,813Land / acre
22.2"Annual rain
5.3% of yrsSevere drought
0.2 / yr (+0.2)Mid-century 100°F days
20.3 daysMid-century dry spell
1.05" (+5.2%)Mid-century 1-day rain
1.22×Wildfire change factor
100%Forward climate coverage
$1,462Home insurance / yr
3.9% / yrInsurance growth
1.26%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
985People within 30 min
395,429People within 2 hr
6,618Radius comparison (15 mi)
7.6People / sq mi
55.6%Federal land
61.3%Land at 15% slope or less
11.5%Soils rated "not limited" for septic (strict USDA rating)
129,841 acWorkable land screen
48.4%Wooded land
28.3 tonsBiomass / forest ac
39.8°FAvg temp

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Cities and towns in Fremont 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.

Not yet researched: Drummond · Island Park · Parker · Warm River

Answers from the rulebook for Fremont County

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

Fremont County rules

  • Building permitRequired

    Structural modifications and county-administered construction.

    • Exemptions include certain one-story detached accessory structures of no more than 200 square feet, fences not over 6 feet, certain retaining walls, grade-supported water tanks up to 5,000 gallons, sidewalks and driveways, finish work, shallow prefabricated pools, playground equipment, qualifying window awnings, and reroofing up to two layers.
    • All structural modifications require application and approval.
    • The county page states county permit administration does not apply within St. Anthony city limits.

    detached accessory structure exemption floor area: <= 200 square feet (must be one-story/ground level, more than 3 feet from another structure, not used for habitation, and without plumbing or electricity) · fence exemption height: <= 6 feet · retaining wall exemption height: <= 4 feet (unless supporting a surcharge) · grade-supported water tank exemption capacity: <= 5000 gallons (height-to-diameter or width ratio must not exceed 2 to 1) · window awning exemption projection: <= 54 inches (must be wall-supported and require no additional support) · reroof exemption: <= 2 layers total

    “All structural modifications require a building permit to be applied for and approved.”
    One more reviewed finding on this topic
    • Required — Construction, reconstruction, and structural modifications in Fremont County outside St. Anthony city limits.
      “All structural modifications require a building permit”
  • Building code adoptedPartial

    International Building Code requirements administered by Fremont County for permits, excluding St. Anthony city limits.

    • The county page also links the 2018 International Residential Code and 2018 International Building Code.
    • St. Anthony city limits are excluded from the county administration statement.

    code edition: 2018 International Building Code · code edition: 2018 International Residential Code

    “Fremont County administers the International Building Code requirements in the issuance of all permits, except within the city limits of St. Anthony.”
    2 more reviewed findings on this topic
    • Adopted (with conditions) — International Building Code requirements administered by Fremont County outside St. Anthony city limits.
      “administers the International Building Code requirements”
    • Adopted (with conditions) — County-administered building work in Fremont County.
      “Agricultural buildings, as defined by the International Building Code, are exempt from the building codes adopted herein but shall remain subject to placement requirements and permits established by zoning regulations.”
  • InspectionsRequired

    County-administered building projects requiring final inspection before occupancy.

    • The county checklist requires permits to remain posted until final inspection and occupancy are granted.
    • County administration does not apply within St. Anthony city limits.
    “Building Permits should be posted on the construction site when the project is started, and should remain on site until final inspection and occupancy is granted.”
  • County-wide zoningPresent

    Land uses within Fremont County areas governed by the Fremont County Development Code.

    • The county building page states that St. Anthony city limits are excepted from county building-code administration; incorporated municipalities may administer their own rules.
    “Fremont County’s intent is that there be no unzoned land in the County. All private lands outside of the boundaries of any incorporated city – and any public lands that fall under the County’s jurisdiction for any reason – are considered zoned by this Ordinance.”
    2 more reviewed findings on this topic
    • Present (with conditions) — Zoning and land-use regulation in unincorporated Fremont County.
      “For the purpose of this Ordinance, the unincorporated territory of Fremont County, Idaho, is divided into the following zoning base districts whose boundaries are established on the Fremont County Preferred Land Use Map and all official zoning maps of Fremont County.”
    • Present (with conditions) — Zoning in the unincorporated territory of Fremont County.
      “For the purpose of this Ordinance, the unincorporated territory of Fremont County, Idaho, is divided into the following zoning base districts whose boundaries are established on the Fremont County Preferred Land Use Map and all official zoning maps of Fremont County.”
  • Local zoningVaries (with conditions)

    Aggregate local zoning across Fremont County; the county regulates unincorporated territory while incorporated municipalities may administer their own land-use rules.

    • The county Development Code applies to unincorporated territory.
    • The county building page states that county administration excludes the city limits of St. Anthony; municipal rules may therefore differ within incorporated areas.
    “NOTICE OF PUBLIC HEARING REGARDING PROPOSED AMENDMENT TO COMPREHENSIVE PLAN AND ZONE CHANGE FROM LOWER DENSITY RESIDENTIAL (LDR) TO HIGHER DENSITY RESIDENTIAL (HDR)”
  • Zoning districtsPublished

    Zoning districts and overlays established by the Fremont County Development Code.

    • The code adopts an official map of the districts.
    • District-specific uses and dimensional standards apply.
    “This chapter creates zoning districts and zoning district overlays that regulate the type and intensity of land uses in the County, and adopts an official map of those districts.”
  • Minimum lot sizeSpecified

    Residential zoning districts, including Rural, Rural Conservation, Rural Living, Residential Rural Urban Transition, and related districts.

    • The Code provides district-specific minimum lot sizes and density standards.
    • For rural zones, a nonresidential subdivision lot may receive an exception if the applicant records a plat note and deed restriction barring a future septic system.

    minimum lot size: 1 acre (varies by district and may be subject to district-specific standards)

    “Rural Living 40 units/ 100 acres 1.0 acres 25%”
  • SetbacksSpecified

    County residential and rural zoning districts.

    • Setbacks vary by zoning district, roadway classification, and property-line location.
    • Corner lots must meet required setbacks along both road frontages.
    • Measurements are generally taken from the edge of the right-of-way, with a centerline method where the ROW edge is unknown.

    rural arterial, collector, or section-line setback: 50 feet · rural other-roadway setback: 30 feet · rural non-road-fronting property-line setback: 25 feet · residential RUT arterial or collector setback: 30 feet (district-specific)

    “Arterial, collector, or section line street 50 50 50 Other roadway 30 30 30 Property line not fronting a roadway 25 25 25”
  • Lot coverageSpecified

    County zoning districts governed by dimensional standards tables.

    • Coverage limits vary by district.
    • Rural district coverage is 50 percent, subject to the cited square-foot special-use threshold.
    • Residential district coverage is 50 percent in the cited table and may not exceed 25,000 square feet without a special-use permit.

    rural district maximum coverage: 50 percent (lot coverage shall not exceed 14,000 square feet without a special-use permit) · residential district maximum coverage: 50 percent (lot coverage shall not exceed 25,000 square feet without a special-use permit)

    “Maximum coverage (in percent)3 50 50 50 [...] Lot coverage shall not exceed 14,000 square feet without the granting of a special use permit.”
    One more reviewed finding on this topic
    • Specified — Residential and other zoning districts governed by the Fremont County Development Code.
      “Lot coverage shall not exceed 25,000 square feet without the granting of a special use permit.”
  • Building heightSpecified

    County zoning districts governed by dimensional standards tables.

    • Height varies by district and use.
    • In the rural table, single-family height is 30 feet, multifamily/commercial/industrial height is 40 feet, and accessory-structure height is 25 feet.
    • A special-use permit may be requested to exceed the cited residential height limit.

    rural single-family maximum height: 30 feet · rural multifamily, commercial, or industrial maximum height: 40 feet · rural accessory-structure maximum height: 25 feet

    “Single Family 30 30 30 Multifamily, Commercial, Industrial 40 40 40 Accessory Structures 25 25 25”
    One more reviewed finding on this topic
    • Specified — Buildings and accessory structures in Fremont County zoning districts.
      “Building Height-As per Fremont County Ordinance buildings are not to exceed 30 feet unless they are accessory structures then they are not allowed to exceed 25 feet.”
  • Living in an RVProhibited

    Using a recreational vehicle or travel trailer as a single-family dwelling in unincorporated Fremont County.

    • The prohibition is subject to the specific temporary-living-quarters exception in Section 3.24.010.
    • The Code separately regulates recreational-vehicle parks under Appendix N.
    “Recreational vehicle and travel trailers are not single family dwellings, and shall not be used as such, but are included within the definition of “manufactured home” for the purposes of Appendix Q.”
    4 more reviewed findings on this topic
    • Allowed (with conditions) — Occupancy of recreational vehicles in a Fremont County recreational vehicle park.
      “Recreational vehicle parks are intended to provide for the accommodation of visitors to Fremont County by who travel to or within the County by recreational vehicle and reside in a recreational vehicle park. The provision of these Standards are intended to create a safe, healthful, and beneficial environment for occupants of the recreation vehicle parks and to protect the character and integrity of surrounding uses.”
    • Prohibited — Recreational vehicles, travel trailers, and similar vehicles or trailers left in place for 180 or more consecutive days within the Fremont County Floodplain Overlay District.
      “that are left in place for 180 or more consecutive days (use of such vehicles as a residence is prohibited by this Ordinance)”
    • Temporary only (with conditions) — One recreational vehicle used as temporary living quarters while a permitted single-family dwelling is being constructed in Fremont County.
      “No temporary certificate of occupancy shall be issued for more than 180 calendar days. 3.24.010 A temporary certificate of occupancy may be issued for the use of one recreational vehicle as temporary living quarters while a single family dwelling for which a permit has been approved pursuant to this Ordinance is being constructed. a. No such certificate shall be issued, and no such use permitted, until an approved sewage disposal system has been installed, and the temporary living quarters connected to that system. b. The temporary certificate of occupancy expires with the permit and the temporary living quarters shall be removed before a certificate of compliance/occupancy can be issued for the completed single-family dwelling.”
    • Temporary only (with conditions) — One recreational vehicle used as temporary living quarters while an approved single-family dwelling is being constructed.
      “A temporary certificate of occupancy may be issued for the use of one recreational vehicle as temporary living quarters while a single family dwelling for which a permit has been approved pursuant to this Ordinance is being constructed. [...] No temporary certificate of occupancy shall be issued for more than 180 calendar days.”
  • Camping on your landLimited

    Temporary camping, personal-use campgrounds, commercial campgrounds, and RV parks in unincorporated Fremont County.

    • The Development Code defines a campground as temporary, generally 15 days or less, living quarters using tents, camp trailers, travel trailers, motor homes, or similar movable or temporary sleeping quarters.
    • Personal use of one’s own property for camping does not constitute a campground under the definition.
    • The use table lists personal-use campgrounds as permitted, commercial campgrounds as Class II, and RV parks as Class II.
    • Class II uses require Planning and Zoning Commission approval.

    general campground duration: <= 15 days or less (The code says generally 15 days or less.)

    “Campground. An area to be used – as temporary (generally 15 days or less) living quarters for recreation, education, or vacation purposes; by camping in tents, camp trailers, travel trailers, motor homes, or similar movable or temporary sleeping quarters of any kind. [...] Personal use of one’s own property for camping does not constitute a CAMPGROUND as regulated by this Code.”
  • Who permits septicMixed

    Onsite sewage disposal in Fremont County as administered by Eastern Idaho Public Health and governed by Idaho statewide rules.

    • Eastern Idaho Public Health serves Fremont County and other Region 7 counties.
    • The program reviews wastewater applications, performs onsite evaluations, issues wastewater permits, and conducts inspections.
    • IDAPA 58.01.03 supplies the statewide installation-permit rule.
    “Serving Bonneville, Clark, Custer, Fremont, Jefferson, Lemhi, Madison, and Teton Counties”
    2 more reviewed findings on this topic
    • Local — Wastewater and onsite sewage permitting in Fremont County through Eastern Idaho Public Health.
      “Serving Bonneville, Clark, Custer, Fremont, Jefferson, Lemhi, Madison, and Teton Counties”
    • Local (with conditions) — Septic and subsurface sewage administration serving Fremont County.
      “Serving Bonneville, Clark, Custer, Fremont, Jefferson, Lemhi, Madison, and Teton Counties”
  • Septic permitRequired

    An individual septic system associated with a Fremont County building permit.

    • The septic permit is required upon submittal of the county building permit application.
    • The county checklist identifies Eastern Idaho Public Health as the relevant health district.
    “If you will be placing an individual septic system, you will need to complete a sewer application with Eastern Idaho Public Health District. The septic permit is required upon submittal of the building permit application.”
  • Septic inspectionRequired

    Septic tanks and drainfields installed under an EIPH permit in Fremont County.

    • Inspection must occur before covering.
    • Covered systems must be uncovered for inspection.
    • 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 in order to determine if the system was installed in accordance with the issued permit. It is the owner’s or installer’s responsibility to call for final inspection. Systems covered prior to final inspection will be required to be uncovered for final inspection.”
  • Mandatory utility hookupConditional

    Building projects in Island Park/Mack’s Sewer System or Last Chance/Pond’s Sewer System areas where community sewer is available.

    • If community sewer is available, the hook-up fee must be paid before receiving the building permit.
    • If an individual septic system is used, an EIPH septic permit is required with the building permit application.

    community sewer hook-up fee: 7458 USD (Island Park/Mack’s Sewer System or Last Chance/Pond’s Sewer System areas)

    “If community sewer (Island Park/ Mack’s Sewer System or Last Chance / Pond’s Sewer System) is available to your building in I.P. /Mack’s Sewer or Last Chance/Pond’s Sewer system areas, a hook up fee of $7,458.00 must be paid prior to receiving your building permit. These fees must be paid at the Fremont County Treasurer’s Office after applying for the building permit.”
    One more reviewed finding on this topic
    • Sewer (with conditions) — Buildings in the Island Park/Mack’s Sewer System or Last Chance/Pond’s Sewer System areas when community sewer is available.
      “If community sewer (Island Park/ Mack’s Sewer System or Last Chance / Pond’s Sewer System) is available to your building in I.P. /Mack’s Sewer or Last Chance/Pond’s Sewer system areas, a hook up fee of $7,458.00 must be paid prior to receiving your building permit.”
  • Agricultural exemptionConditional

    Agricultural buildings meeting the International Building Code definition.

    • Agricultural buildings are exempt from the adopted building codes.
    • They remain subject to zoning placement requirements and permits.
    • If used for purposes outside the exemption definition, the exemption is revoked and a building permit is required, with possible fines.
    “Agricultural buildings, as defined by the International Building Code, are exempt from the building codes adopted herein but shall remain subject to placement requirements and permits established by zoning regulations.”
  • Subdividing landRegulated (with conditions)

    Short plats, standard subdivisions, land divisions, and subdivision improvements in Fremont County.

    • Every short plat subdivision must comply with applicable goals, regulations, and standards of the Development Code.
    • Short subdivisions may not be further subdivided except through the specified standard or Class II process, subject to the code's limited revision exception.
    • Subdivision plans must address roads, utilities, sewage, water, percolation tests, and other required improvements.
    “Every short plat subdivision shall comply with all applicable goals, regulations and standards of this Ordinance.”
    One more reviewed finding on this topic
    • Regulated (with conditions) — Land divisions, short plats, standard subdivisions, replats, and related applications in Fremont County.
      “A Class II permit shall be required for: a. Any land split, division, subdivision, or portioning that creates one (1) or more parcels or lots with the right to build or construct improvements;”
  • Driveway accessRequired

    New access to a Fremont County road or highway for county-permitted construction.

    • A driveway permit is required through the County Public Works Department or Idaho Transportation Department.
    • The building permit does not imply that the county will maintain the road to the property.
    • The current application states driveway permits are required for all new builds off County Roads.
    “If a new access to a County Road or Highway is being built a Driveway Permit will be required thru the Public Works Dept. or ITD. (Just because a building Permit for new construction has been approved through the county does not mean the county will be maintaining the roads to your property.)”
  • Building in a floodplainRequired

    Activities in stream, lakeshore, and special flood hazard areas established by the Fremont County Development Code.

    • A Class I permit is required for dredging, filling, clearing, grading, excavation, retaining walls, shoreline stabilization, and accessory buildings in covered areas.
    • Activities proposed as part of a subdivision or Class II application may be evaluated through the Class II application.
    • Subdivision property in a mapped floodplain may need Base Flood Elevation information on the plat; the application page specifies this example for property five acres or larger.

    example floodplain plat threshold: >= 5 acres (for the application page's Base Flood Elevation example)

    “A Class I permit shall be required for any activity, including dredging, filling, clearing, grading, excavation, the construction of retaining walls or other means of shoreline stabilization, and the construction of accessory buildings within stream or lakeshore corridors and special flood hazard areas established by this Ordinance”
    One more reviewed finding on this topic
  • Short-term rentalsLimited

    Short-term or vacation rentals of dwelling units in Fremont County, including residential areas.

    • Fremont County's official Planning page states that cities and counties may not require a license, fee, permit, certification, or registration before a dwelling is rented as a short-term rental.
    • The published Development Code defines a vacation rental as a single-family dwelling used residentially for a short period, with the entire dwelling rented, and identifies sleeping units as not vacation rentals.
    • The published Development Code contains residential transient-rental standards, including a 30-consecutive-day-or-less definition, contact-person and roadway-access requirements, 150 square feet per occupant, and maximum overnight capacities of 15 occupants for minor transient use and 30 occupants for expanded transient use.
    • The Development Code's residential-business/lodging permit requirement is inconsistent with the county's official statement of the later Idaho short-term-rental law and therefore is not treated as an enforceable permit condition in this claim.
    • Uses exceeding 30 overnight occupants or failing the Division 5 standards are classified by the published code as major transient/commercial uses requiring commercial requirements, including proper commercial zoning; the enforceability of any requirement that functions as a prohibited short-term-rental permit or registration requirement remains subject to the state-law limitation.

    short-term rental term: <= 30 consecutive days or less (The code separately classifies sleeping units as not vacation rentals.) · minor transient maximum overnight occupants: <= 15 occupants · expanded transient maximum overnight occupants: <= 30 occupants (More than 15 occupants and no more than 30 occupants.) · individual capacity: 150 square feet per occupant (Heated, habitable portion of the home offered for transient rental use.)

    “Monday March 16th, Governor Little signed a bill into law that forbids cities and counties from requiring any “license, fee, permit, certification, or registration” before a dwelling can be rented as a short-term rental.”
    2 more reviewed findings on this topic
    • Allowed — A dwelling rented as a short-term rental in Fremont County.
      “Governor Little signed a bill into law that forbids cities and counties from requiring any “license, fee, permit, certification, or registration””
    • Limited — Short-term rental dwellings in Fremont County, including unincorporated county areas to the extent regulated by Fremont County.
      “Monday March 16th, Governor Little signed a bill into law that forbids cities and counties from requiring any “license, fee, permit, certification, or registration” before a dwelling can be rented as a short-term rental.”
  • Permit feesPublished (with conditions)

    Fremont County Planning and Building Department fees listed in the published schedule.

    • The schedule is identified as Resolution 2011-16 Exhibit A and effective July 1, 2011; newer fee schedules or amendments may apply.
    • Examples include General Class I Permit $195, General Class II Permit $495, County Road Access $50, and Site Plan Zoning Permit fees varying by use.

    General Class I Permit: 195 USD (schedule effective July 1, 2011) · General Class II Permit: 495 USD (schedule effective July 1, 2011) · County Road Access: 50 USD (requires Public Works approval; schedule effective July 1, 2011) · Single Family Dwelling site plan zoning permit: 50 USD (plus building permit; schedule effective July 1, 2011)

    “Planning and Building Department Fee Schedule Resolution 2011-16 Exhibit A, Effective July 1, 2011 Procedure Type Fee General Class I Permit $195.00”
    One more reviewed finding on this topic
    • Published (with conditions) — County building-permit and site-plan-review fees.
      “Building permit fees are based on square footage and the type of construction (i.e. garage, residence, shed, carport). A DEPOSIT is due upon submittal.”
  • Permit processPublished (with conditions)

    County building-permit application and review process.

    • Incomplete applications will not be accepted or processed.
    • The checklist requires parcel, section, township, range, and subdivision information when applicable.
    • Two sets of detailed plans, supporting documents, engineering calculations, and truss designs are required before approval.
    • Plans must be submitted on minimum 11-by-17-inch paper.
    • Plans in areas with at least 70 pounds per square foot roof snow load require a licensed Idaho structural engineer or architect.
    • Permits are valid for two years.
    • The application must be signed by the landowner or accompanied by a signed permission letter.
    • Review and approval may take approximately four to six weeks.
    • An accurate detailed site plan and $50 site-plan-review fee are required.

    estimated review time: 4 to 6 weeks · permit validity: 2 years · minimum plan paper size: 11 x 17 inches · roof snow-load engineering threshold: >= 70 lb/ft²

    “Once started it could take approximately 4 to 6 weeks to review & approve your Building plans. An incomplete application will NOT be accepted or processed!”
    One more reviewed finding on this topic
    • Partial — County planning, zoning, building, subdivision, and sewer-connection processes.
      “The supervisor has up to 14 days to complete this review.”

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.”
    6 more reviewed findings on this topic
    • Available (with conditions) — An owner who performs construction work on the owner's own land in Idaho, including Fremont County, without intending to sell the property within 12 months.
      “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 owner performing construction work on the owner's own land in Fremont County, Idaho, under Idaho's contractor-registration law.
      “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.”
  • Manufactured homesLimited

    Occupancy of manufactured homes installed in Idaho.

    • For new homes in areas without an approved local building program, an installation permit and installation tag are required before installation begins.
    • All installations must be inspected and approved by DOPL or the authority having jurisdiction before the manufactured home is occupied.
    • Manufactured homes are for residential use only and are regulated under federal manufactured-housing standards plus state and local requirements.
    “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. 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.”
  • 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
    • Required — Well construction in Fremont County under Idaho statewide administration.
      “The Idaho Department of Water Resources (IDWR) has statutory authority for the state-wide administration of the rules governing well construction and the licensing of drillers in Idaho. 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.”
  • 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.

  • Certificate of occupancy — Whether a separate certificate of occupancy is required for Fremont County projects.
  • Minimum dwelling size — Minimum floor area or other minimum dwelling-size requirement in Fremont County.
  • Tiny homes — Tiny-home occupancy in Fremont County.
  • Off-grid sanitation — Off-grid sanitation systems in Fremont 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 Fremont 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 ↗

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 Fremont County, Idaho

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

Fremont County scores 64/100 on the Bolthole Index, a strong county profile. Its strengths: a stronger property-autonomy legal backdrop and deep seclusion — about 985 people within a 30-minute drive. Watch-outs: more administrative friction around building and land use and thin water margin (22.2″/yr rainfall).

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

Fremont County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Eastern Idaho Public Health (District 7). 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 Fremont County?

Living in an RV on your own land in Fremont County is prohibited: Using a recreational vehicle or travel trailer as a single-family dwelling in unincorporated Fremont County. The prohibition is subject to the specific temporary-living-quarters exception in Section 3.24.010. The Code separately regulates recreational-vehicle parks under Appendix N. Confirm with the county before relying on it.

How much does land cost in Fremont County, Idaho?

Land in Fremont County runs about $4,813 per acre, based on the latest county data.

What is the water situation in Fremont County?

Fremont County gets about 22.2" of rain a year, with severe drought in roughly 5.3% of years. On water rights, Fremont 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 Fremont County?

A representative private-land location has about 985 people within a 30-minute drive and 395,429 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 Fremont compares in Idaho

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