Bolthole Index

Gem County, Idaho

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

62Index Score / 100
#22 of 44 in Idaho

Gem County, Idaho requires a permit for buildings, structures and land-use changes in unincorporated territory, where Gem County Development Services administers building permits and Title 11 zoning together12. Incorporated cities may run separate zoning rules2. Septic permits come from Southwest District Health, not the county building office3.

At a glance

Building permit
Required for regulated construction and structural alterations1
Zoning
County zoning applies in unincorporated Gem County2
Septic
Permitted by Southwest District Health after a site evaluation34
RV living
Conditional on parcel size, duration, wastewater approval and a county residency permit5
Manufactured home
Allowed by zone and home type; some permanent occupancy needs a special-use permit6
Agricultural building
Building-code exemption is conditional; zoning placement rules still apply7
Owner-builder
Exempt from Idaho contractor registration when the state conditions are met; permits still apply89
Private well
An Idaho well-drilling permit is required before drilling10

Who to call

Building permits

Gem County Development Services

Gem County building, zoning, subdivision, nuisance and flood-control code administration

(208) 365-5144

116 E 3rd Street

Septic permits

Southwest District Health Environmental Health

Septic tanks, drainfields, site evaluations and subsurface sewage disposal permits

208-455-5400

Online permits →

Contact details are copied from each office’s official page and were checked against it on October 9, 2026.

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

Yes. Gem County requires a permit for buildings, structures and changes in land or building use covered by county zoning and building rules.1 Gem County's adopted building codes update when successive versions adopted or approved by the Idaho building code board take effect.11 A certificate of occupancy is required for a building or premises created, changed, converted, altered or enlarged in use or structure under Title 11; a temporary certificate may cover alterations or partial occupancy for up to 6 months.12

Agricultural buildings are exempt from adopted building codes but remain subject to zoning placement requirements.7 Gem County directs applicants to its fee schedule, so ask Development Services for the current charge for the specific application.13 An owner doing construction on the owner's own land may qualify for Idaho's contractor-registration exemption when there is no intent to sell within 12 months, but county permits, inspections, codes and land-use rules still apply.8

Who handles Gem County building permits and inspections?

Gem County Development Services is the first stop for building, zoning, subdivision and floodplain questions because the department enforces the county code titles for building regulations, zoning regulations and flood control.14 The office is at 116 E 3rd Street and can be reached at (208) 365-5144.14

Ask Development Services to identify the parcel's zoning district, correct application, required plan documents, current fees and inspection sequence because requirements vary by application.15 The countywide residential inspection sequence could not be confirmed; the available inspection evidence applies only to Shadow Butte Industrial Park.16 That development's utility approvals, fees and permit process should not be applied to another parcel.171819

Does Gem County have zoning?

Yes. Gem County administers Title 11 zoning in unincorporated territory; incorporated municipalities may administer separate land-use rules.2 The county publishes countywide and Valley-only zoning maps, but Development Services must confirm a parcel's classification.20

Setbacks and height limits vary by zoning district, use and applicable exceptions; structures over 6 stories require a special-use permit.2122 Gem County allows one permanent accessory dwelling subordinate to an existing single-family dwelling in zones allowing residential use, subject to ownership, size, water and wastewater conditions.23 Manufactured-home rules vary by zone, home type and foundation status.6 Lot size depends on the zone: in the R-2 residential transitional zone, which is meant for lots served by individual wells and septic systems, a single-family dwelling needs at least 1 acre, and lot area must also be large enough for a sewage absorption system24. We could not confirm a universal minimum dwelling size or lot-coverage limit; ask Development Services for the standards affecting the parcel.14

How do septic permits work in Gem County?

Southwest District Health handles Gem County septic permitting and conducts an on-site evaluation before issuing a subsurface sewage disposal permit.325 The applicant must arrange a backhoe for a 10-foot test hole, and the evaluation and permit do not transfer between owners.4 Southwest District Health accepts site-evaluation and permit applications through its Environmental Health Portal.25

Only about 4.1% of mapped county soils avoid a “very limited” rating for conventional drain fields, so septic feasibility belongs near the start of due diligence.26 Extended Treatment Package systems require annual testing, inspection and maintenance by a licensed service provider.27 An accessory-dwelling application also requires Southwest District Health septic approval.28

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

Gem County allows 1 RV as primary living quarters on a legal parcel of at least 1 acre outside a legal RV or manufactured-home park, subject to a county residency permit and an approved or accepted wastewater arrangement.5 The rule applies when occupancy exceeds 30 days in a year and generally allows use for 1 year, with a possible 1-year extension when the RV is appropriately screened.5 The RV residency application lists a $125 fee for one year and a $60 fee for a second-year extension29. A 6-month on-site compliance inspection and applicable setbacks also apply.5

A tiny home on wheels cannot be used as an accessory dwelling; the reviewed rule does not settle every other tiny-home occupancy scenario.30 A permanent accessory dwelling may accompany an existing single-family home, but it cannot be separately owned and must connect to the existing domestic water supply and an approved wastewater system.2331 Ask Development Services before placing another type of tiny home or using land for temporary camping.14

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

  1. Ask Gem County Development Services to confirm county jurisdiction, identify the zoning district, and provide the applicable setbacks, floodplain requirements, fees and building application.32211314
  1. Arrange Southwest District Health's on-site septic evaluation and supply the backhoe for the 10-foot test hole.4
  1. If the property needs a well, obtain an Idaho drilling permit before drilling and use an IDWR-licensed well driller.10
  1. Resolve access. A new accessory-dwelling driveway requires a county permit, while a driveway entering state highway right-of-way requires an Idaho Transportation Department encroachment permit.3334
  1. Submit the county building application and required documents, confirm separate trade permits, obtain the inspection sequence, and secure the required certificate of occupancy before use.153512

What should you check before buying land in Gem County?

Start with a parcel-specific zoning review through Gem County Development Services because setbacks and permitted housing types depend on the zoning district.216 Land divisions under 40 acres generally require a plat application under the Subdivision Ordinance, while the reviewed rule describes limited exemptions for certain divisions of 40 acres or more.36

Make an accepted septic evaluation a purchase contingency because only about 4.1% of mapped soils avoid severe limitations for conventional drain fields.26 Verify legal access and whether the driveway meets a county road or state highway; a state-highway approach needs an Idaho Transportation Department encroachment permit.34 Flood-zone development must meet Gem County flood-control rules, requires an Elevation Certificate and requires engineering studies for fill in the floodplain.37 For budgeting context, the effective property-tax rate is about 0.4%, and the median annual property-tax bill is about $1,443.3839

Watch-outs

  • The agricultural-building exemption covers adopted building codes, but zoning placement requirements still apply.7
  • Setbacks vary by zoning district and use; confirm the parcel's district standards before choosing a building site.21
  • A septic site evaluation and permit do not transfer automatically to a new owner.4
  • An RV residency permit is conditional on parcel size, duration, wastewater, inspection and setback requirements.5
  • Manufactured-home rules differ by zone, home type and foundation status.6

Sources

  1. Gem County Code § 11-14-1, Building Permit Required, quoted and re-checked
  2. Gem County Code § 11-14-1, Building Permit Required, quoted and re-checked
  3. Septic & Land Development – Southwest District Health, quoted and re-checked
  4. Septic & Land Development – Southwest District Health, quoted and re-checked
  5. Recreational Vehicles – Living Quarters Ordinance, quoted and re-checked
  6. Gem County Code § 11-6-8, Manufactured and Mobile Homes Standards, quoted and re-checked
  7. Gem County Code, Chapter 1 Building Codes, quoted and re-checked
  8. Contractors Archives — Idaho Division of Occupational and Professional Licenses, quoted and re-checked
  9. How To Purchase a Trade Permit (Idaho statewide rule), quoted and re-checked
  10. Wells Overview (Idaho statewide rule), quoted and re-checked
  11. 9-1-1: Building Codes Adopted, quoted and re-checked
  12. 11-14-5: Certificate of Occupancy, quoted and re-checked
  13. Planning and Zoning FAQs, quoted and re-checked
  14. Gem County Development Services (gemcounty.org)
  15. Planning and Zoning FAQs, quoted and re-checked
  16. Gem County Development Services Shadow Butte Industrial Park Development Application Packet, quoted and re-checked
  17. Gem County Development Services Shadow Butte Industrial Park Development Application Packet, quoted and re-checked
  18. Gem County Development Services Shadow Butte Industrial Park Development Application Packet, quoted and re-checked
  19. Gem County Development Services Shadow Butte Industrial Park Development Application Packet, quoted and re-checked
  20. Planning and Zoning FAQs, quoted and re-checked
  21. Gem County Code § 11-6-2, Supplemental Yard and Height Regulations, quoted and re-checked
  22. Gem County Code § 11-6-2, Supplemental Yard and Height Regulations, quoted and re-checked
  23. Accessory Dwelling Units Ordinance and Application, quoted and re-checked
  24. 11-4-4: Residential, quoted and re-checked
  25. Southwest District Health Environmental Health (swdh.id.gov)
  26. 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
  27. Septic & Land Development, quoted and re-checked
  28. Accessory Dwelling Units Ordinance and Application, quoted and re-checked
  29. R.V. Residency Application, quoted and re-checked
  30. Master Administrative Review Application and Accessory Dwelling Units Ordinance, quoted and re-checked
  31. Accessory Dwelling Units Ordinance and Application, quoted and re-checked
  32. Planning and Zoning FAQs, quoted and re-checked
  33. Accessory Dwelling Units Ordinance and Application, quoted and re-checked
  34. Types of Right-of-Way Encroachment Permits (Idaho statewide rule), quoted and re-checked
  35. Frequently Asked Questions (FAQs) - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
  36. gemcounty.org, quoted and re-checked
  37. gemcounty.org, quoted and re-checked
  38. Effective property tax rate: Bolthole Index county data
  39. Median property tax bill: Bolthole Index county data

Written October 9, 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, Gem County requires a building permit for a home.

RuleGem CountyBoise CountyWashington CountyPayette CountyValley CountyAdams CountyAda County
Building permitRequiredRequiredRequiredRequiredRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsSouthwest District HealthCentral District HealthSouthwest District HealthSouthwest District HealthCentral District HealthSWDHCentral District Health

County locator

Gem County in Idaho

62
County map
Gem County highlighted among the Idaho counties · colored by Index score

How Gem County scores

Seclusion52100% ev.
Self-Sufficiency51100% ev.
Admin Boringness3890% ev.
Durability49100% ev.
Property Autonomy90100% ev.
Carry Cost74100% 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 →

$488kTypical home
0.4%Property tax
$4,014Land / acre
19.4"Annual rain
6.2% of yrsSevere drought
12.9 / yr (+11)Mid-century 100°F days
36.9 daysMid-century dry spell
0.91" (+7.7%)Mid-century 1-day rain
1.14×Wildfire change factor
100%Forward climate coverage
$1,245Home insurance / yr
4.2% / yrInsurance growth
2.23%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
832,178People within 2 hr
20,404Radius comparison (15 mi)
37.6People / sq mi
37%Federal land
37.1%Land at 15% slope or less
4.1%Soils rated "not limited" for septic (strict USDA rating)
14,227 acWorkable land screen
19.3%Wooded land
65 tonsBiomass / forest ac
49.5°FAvg temp

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Cities and towns in Gem 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 Gem County

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

Gem County rules

  • Building permitRequired

    Buildings, structures, and land-use changes regulated by Gem County Title 11.

    • Agricultural buildings are exempt from the adopted building codes but remain subject to zoning placement requirements.
    • The code text does not establish a general owner-builder exemption.
    “No building or other structure shall be erected, moved, added to or structurally altered”
    One more reviewed finding on this topic
    • Required — Buildings, structures, and changes in land or building use subject to Gem County zoning and building regulations.
      “No building or other structure shall be erected, moved, added to or structurally altered [...] without a permit therefor issued by the administrator.”
  • Building code adoptedAdopted (with conditions)

    Gem County building-code administration.

    • The adopted versions are superseded by successive versions adopted or approved by the Idaho building code board when those versions become effective.
    • Agricultural buildings are exempt from the adopted building codes but remain subject to zoning placement requirements.
    “are adopted as the official building codes of Gem County”
    One more reviewed finding on this topic
  • InspectionsRequired

    New construction in the Shadow Butte Industrial Park development packet.

    • The packet states that the building inspector conducts inspections during construction.
    • This evidence is parcel/development-specific and does not establish a countywide inspection schedule.
    “The building inspector will conduct inspections during construction.”
  • Certificate of occupancyRequired

    Buildings or premises created, erected, changed, converted, altered, or enlarged in use or structure under Gem County Title 11.

    • The certificate must state that the proposed use conforms to Title 11 and all imposed conditional provisions.
    • A temporary certificate may be issued for up to six months during alterations or partial occupancy pending completion.

    temporary certificate duration: <= 6 months (during alterations or partial occupancy pending completion)

    “until a certificate of occupancy shall have been issued therefor by the administrator”
  • County-wide zoningPresent

    Gem County zoning ordinance.

    • The county identifies the ordinance as Gem County Code Title 11.
    “Yes. The Gem County Zoning Ordinance (Gem County Code Title 11) Subdivision Ordinance (Gem County Code Title 12) are on our web site.”
    2 more reviewed findings on this topic
    • Present (with conditions) — Unincorporated Gem County zoning regulations.
      “Zoning permits shall be issued only in conformity with the provisions of this title.”
    • Present (with conditions) — Zoning regulation in Gem County's unincorporated territory.
      “Zoning permits shall be issued only in conformity with the provisions of this title.”
  • Local zoningPresent

    Gem County zoning administered through the county zoning ordinance; this claim does not characterize incorporated-municipality ordinances.

    “Yes. The Gem County Zoning Ordinance (Gem County Code Title 11) Subdivision Ordinance (Gem County Code Title 12) are on our web site.”
  • Zoning districtsPublished

    Gem County zoning districts and maps.

    • The county FAQ states that countywide and Valley-only zoning maps are available.
    • A property-specific classification requires contacting Development Services.
    “In addition, the Gem County Zoning Maps ( County wide or Valley only ) are available (select link).”
    2 more reviewed findings on this topic
  • Minimum lot sizeSpecified

    Single-family dwellings in the R-2 residential transitional zone in unincorporated Gem County.

    • The R-2 area is intended for locations that can be served by individual well and septic systems as approved by the health department.
    • All zones must comply with the minimum-lot-area schedule in section 11-5-7.
    • Lot area must be sufficient for a sewage absorption system based on soil percolation testing under health-department regulations.
    • Area reduction for a subdivision requires approved public-water-supply plans.
    • The table states setbacks are subject to building-code requirements and that certain setback provisions apply unless addressed in covenants; private covenants less restrictive than the code will not be recognized.
    • The table's R-2 lot-area entry has footnote 8 concerning projections into required yards.

    minimum lot area per dwelling unit: 1 acre

    “Minimum Lot Size: One acre minimum lot size requirement.”
  • SetbacksSpecified

    Yard and setback requirements in Gem County zoning districts.

    • Requirements vary by zoning district and use.
    • Corner-lot visibility, screening, and other supplemental yard rules apply.
    • Nonresidential uses abutting residential zones generally require 40 feet, with a possible reduction to 50 percent when approved screening is provided.

    nonresidential yard adjacent to residential zone: >= 40 feet (may be reduced to 50 percent with acceptable commission-approved screening)

    “Nonresidential buildings or uses shall not be located nor conducted closer than forty feet (40')”
    One more reviewed finding on this topic
  • Building heightSpecified

    Building height under Gem County zoning regulations.

    • Height limits are district-specific.
    • Certain appurtenances are excepted from height limitations unless they create an aircraft hazard; structures exceeding six stories require a special-use permit.

    special-use-permit threshold: > 6 stories (appurtenances covered by the section)

    “if the height of such structures is proposed to exceed six (6) stories then a special use permit will be required.”
  • Living in an RVLimited

    Use of an RV as primary living quarters outside a legal RV or manufactured-home park.

    • Applies for more than 30 days in a one-year period.
    • One RV is permitted only on a legal parcel of at least one acre.
    • Use is allowed for up to one year; one one-year extension may be granted if appropriately screened from public view.
    • A six-month on-site inspection is required.
    • A county RV Residency Permit and established fee are required before use.
    • The RV must use a wastewater system approved by or acceptable to the Health Department.
    • If on bare ground, the RV must comply with setbacks under Section 11-5-7.
    • The ordinance does not apply to RV storage or temporary dwellings permitted under Section 11-19.
    • Two or more RVs, parcels under one acre, illegal parcels, and parcels approved for a Chapter 11-19 temporary dwelling are prohibited.

    minimum parcel size: >= 1 acre (RV primary living quarters) · maximum initial occupancy period: 1 year (one one-year extension may be granted if appropriately screened) · inspection interval: 6 months (on-site compliance inspection)

    “All property owners siting a RV under this section are required to obtain a RV Residency Permit and pay the established fee prior to use of the RV as living quarters.”
  • Tiny homesLimited

    Use of tiny homes on wheels as accessory dwelling units in Gem County.

    • Gem County permits accessory dwelling units only in conjunction with, and clearly subordinate to, an existing single-family dwelling, in zone districts allowing residential use.
    • The cited county rule specifically prohibits temporary structures such as tiny homes on wheels from being used as accessory dwelling units.
    • The source does not establish a general countywide prohibition or permission for every other form of tiny-home occupancy.
    “Temporary structures such as a motorhome, camper, recreational vehicle, tiny home on wheels, or other similar dwelling on wheels may not be utilized as accessory dwelling units.”
    One more reviewed finding on this topic
    • Prohibited — Use of a tiny home on wheels as an accessory dwelling unit in unincorporated Gem County.
      “Temporary structures such as a motorhome, camper, recreational vehicle, tiny home on wheels, or other similar dwelling on wheels may not be utilized as accessory dwelling units.”
  • Manufactured homesLimited

    Manufactured-home siting and occupancy in Gem County zoning districts.

    • Manufactured homes are allowed on lots zoned for single-family residential uses and in designated parks or manufactured-home subdivisions.
    • Agricultural zones allow singlewide and multisectional homes; residential zones outside parks allow only multisectional homes.
    • Permanent occupancy of a manufactured/mobile home not on a foundation requires a special-use permit.
    • Temporary-use-permit homes need not be placed on a permanent foundation.
    • HUD approval insignia or Idaho rehabilitation compliance is required.

    minimum floor area in manufactured-home rental communities: >= 400 square feet (singlewide manufactured home)

    “In all agriculture zones, both singlewide and multisectional manufactured homes are allowed.”
  • Accessory dwellingsAllowed (with conditions)

    Permanent accessory dwelling units in Gem County residential zones.

    • One permanent accessory dwelling is allowed with and subordinate to an existing single-family dwelling.
    • Accessory dwelling units are permitted in all zone districts allowing residential use.
    • Before the building permit, recorded restrictions must state the unit cannot be sold separately, must comply with maximum size, and bind successors.
    • The unit may not be subdivided or separately owned.
    • Maximum living area is 1,800 square feet.
    • The unit must use Southwest District Health-approved wastewater and connect to existing domestic water.
    • A certificate of augmentation is required when an existing well is augmented.

    maximum accessory dwelling living area: <= 1800 square feet

    “One (1) permanent accessory dwelling is permitted on the same property in conjunction with, and clearly subordinate to, an existing single-family dwelling, in accordance with the standards listed in this section. Accessory dwelling units shall be permitted in all zone districts that allow for a residential use.”
  • Who permits septicLocal

    Residential and commercial septic tanks and drainfields in Gem County within the Southwest District Health service area.

    • Additional permits may also be required through the applicable city or county.
    • SWDH conducts an on-site evaluation before issuing a subsurface sewage disposal permit.
    “SWDH is responsible for permitting septic tanks”
    One more reviewed finding on this topic
  • Septic permitRequired

    Subsurface sewage disposal systems, septic tanks, and drainfields in Gem County.

    • SWDH must conduct an on-site evaluation before permit issuance.
    • The applicant is responsible for scheduling a backhoe to excavate a ten-foot test hole at the evaluation.
    • Permits and site evaluations are non-transferable between owners.

    test-hole depth: 10 feet (backhoe excavation at the time of the on-site evaluation)

    “Prior to the issuance of a subsurface sewage disposal permit”
    One more reviewed finding on this topic
  • Septic inspectionRequired

    Subsurface sewage disposal permits in Gem County.

    • The applicant must schedule a backhoe to excavate a ten-foot test hole at the time of evaluation.
    • The permit and site evaluation are non-transferable between owners.
    • The site-evaluation cost may be applied to the permit if ownership remains unchanged and the permit application is submitted within one year.

    test-hole depth: 10 feet · permit application deadline after site evaluation: <= 1 year (ownership must remain unchanged)

    “conduct an on-site evaluation of the property.”
    One more reviewed finding on this topic
    • Limited — Extended Treatment Package septic systems in Gem County.
      “ETP systems are required to undergo annual testing”
  • Mandatory utility hookupWater and sewer (with conditions)

    Accessory dwelling units in Gem County.

    • The accessory dwelling must connect to an approved wastewater system.
    • The accessory dwelling must connect to the existing domestic water supply.
    • A certificate of augmentation is required where an existing well is augmented for the additional dwelling.
    “The accessory dwelling unit shall be connected to a wastewater system approved by the Southwest District Health Department. The accessory dwelling shall connect to the existing domestic water supply.”
    2 more reviewed findings on this topic
  • Agricultural exemptionConditional

    Agricultural buildings under Gem County Title 9 building-code adoption.

    • The exemption is from the building codes adopted in Title 9.
    • Agricultural buildings remain subject to zoning placement requirements.
    • The opened material does not establish that the exemption removes all permit or inspection obligations.
    “Agricultural buildings are exempt from the building codes adopted herein”
    One more reviewed finding on this topic
    • Available (with conditions) — Agricultural buildings in Gem County.
      “Agricultural buildings are exempt from the building codes adopted herein but shall remain subject to placement requirements established by zoning regulations.”
  • Subdividing landRegulated (with conditions)

    Subdivision development subject to Gem County Title 12.

    • A subdivision permit application must be approved before final construction-plan submission.
    • Final plans must be prepared by an Idaho-licensed civil engineer.
    • No construction may occur until the county engineer approves final construction plans.
    • Reviewed systems include roads, water supply, sanitary sewer, stormwater, streetlights if proposed, off-site improvements, irrigation water, and site grading.
    “No construction of any kind shall take place on the site of an approved subdivision”
    One more reviewed finding on this topic
    • Regulated (with conditions) — Land divisions in Gem County.
      “Every land division less than 40 acres in size in Gem County is subject to the Subdivision Ordinance and a plat application is required for any land division.”
  • Driveway accessLimited

    New driveway installation associated with an RV residency application in Gem County.

    • A driveway access permit is required if a new driveway is installed.
    • The application directs applicants to Gem County Road and Bridge.
    “Driveway Access Permit (required if new driveway is installed)”
    2 more reviewed findings on this topic
  • Building in a floodplainRequired

    Development and building permits for property in a Gem County flood zone.

    • Development must meet Title 13.
    • An Elevation Certificate is required when property lies within a flood zone, among other standards.
    • Engineering studies are required for fill in the floodplain.
    “Yes, as long as you meet the requirements of Title 13 of the Gem County Code . An Elevation Certificate is required when a property lies within a flood zone, among other standards. Engineering studies are required for fill in the floodplain.”
  • Permit feesVariable (with conditions)

    Gem County permit and development applications.

    • The general code requires a board-established fee schedule and payment before action on an application or appeal.
    • The RV residency application lists a $125 fee for one year and a $60 second-year extension fee if granted.
    • Commercial/industrial applications may require a partial non-refundable plan-review prepayment and county service charges before certificate of occupancy.

    RV residency permit fee: 125 USD (one year) · RV second-year extension fee: 60 USD (if extension is needed, applied for, and granted)

    “Fee: $ 125.00 for (1) one year * Note: $ 60.00 2nd year if time extension is needed and applied for, and granted”
    2 more reviewed findings on this topic
  • Permit processPartial

    Gem County land-use and development application process.

    • The county publishes zoning and subdivision ordinances and provides application materials.
    • Specific process requirements vary by application type.
    “REQUIRED SUBMITTALS: Application Fee: $40.00 (does not include building permit fee)”
    One more reviewed finding on this topic

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 on the owner's own land in Gem County, under Idaho 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.”
  • 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”
  • 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.”
  • 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.

  • Minimum dwelling size — Minimum dwelling size in Gem County.
  • Lot coverage — Lot coverage in Gem County.
  • Off-grid sanitation — Off-grid sanitation in Gem County.
  • Short-term rentals — Short-term rentals in Gem County.

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

Living off-grid in Gem County, Idaho

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

Gem County scores 62/100 on the Bolthole Index, a solid county profile. Its strengths: a stronger property-autonomy legal backdrop and manageable long-term carry cost. Watch-outs: more administrative friction around building and land use.

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

Gem County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Southwest District Health. 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 Gem County?

Living in an RV on your own land in Gem County is limited to specific cases: Use of an RV as primary living quarters outside a legal RV or manufactured-home park. Applies for more than 30 days in a one-year period. One RV is permitted only on a legal parcel of at least one acre. A tiny home is limited to specific cases. Confirm with the county before relying on it.

How much does land cost in Gem County, Idaho?

Land in Gem County runs about $4,014 per acre, based on the latest county data.

What is the water situation in Gem County?

Gem County gets about 19.4" of rain a year, with severe drought in roughly 6.2% of years.

How remote is Gem County?

A typical private-land location has about 20,404 people within 15 miles and 1,130,603 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

How Gem compares in Idaho

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