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

At a glance

Building permit

Required for remodels, additions, structures over 200 square feet, structures with utilities and permanently affixed structures¹

Zoning

County zoning applies to unincorporated land and city impact areas; district standards differ⁵⁶⁷

Septic permits

South Central Public Health District issues permits for new and repaired systems⁸⁹

RV living

Long-term occupancy on private land is unconfirmed; ask Planning & Zoning because unincorporated land is zoned¹⁰

Tiny homes

No tiny-home definition in the county code; a tiny home over 200 square feet, with utilities or affixed needs a permit and a certificate of occupancy before use¹¹¹²

Owner-builder

Owners working on their own Idaho land can be exempt from contractor registration if they do not intend to sell within 12 months; permits still apply¹³¹⁴

Agricultural building

Qualifying agricultural buildings need zoning and AG siting permits rather than a building permit, plus a recorded use attestation¹⁵

Well permit

An IDWR drilling permit is required before drilling, and the driller must be licensed¹⁶

Who to call

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

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

Unincorporated Jerome County requires a building permit before covered construction begins: remodels, additions, structures over 200 square feet, structures with electricity or plumbing, and permanently affixed structures are covered¹. Qualifying one-story detached accessory structures no greater than 200 square feet can be exempt from building permits, but small size alone does not waive zoning approval or permit triggers such as attachment and utilities¹¹⁷. Jerome County administers adopted residential codes, including the 2018 International Residential Code with amendments¹⁸. Electrical, plumbing and HVAC work requires trade permits, although the administering jurisdiction varies by location¹⁹. An owner working on the owner’s own Idaho land can be exempt from contractor registration if the owner does not intend to sell within 12 months; applicable permits and inspections still apply¹³¹⁴. Non-exempt structures require certificate-of-occupancy approval and a separate certificate of compliance before use or occupancy²⁰.

Who is the Jerome County building department?

The Jerome County Building Department handles inspection, plan review and investigative services in unincorporated Jerome County²¹. Its office is at 300 N Lincoln, Room 200, Jerome, ID 83338, and the main phone is 208-324-9262²¹. Planning & Zoning shares that room and can be reached at 208-324-9116 or planning&zoning@co.jerome.id.us²². Start with an Information Request so Planning & Zoning can confirm that the project is allowed on the parcel; zoning approval must come before building-permit review²³²⁴. An application inactive for 90 days after notice of missing information may be returned without refund; construction must begin within 180 days unless extended in writing¹⁷. Zoning applications require a nonrefundable fee set by the Board, but the current amount was not confirmed²⁵.

Does Jerome County have zoning?

Jerome County zones unincorporated land and controls zoning activities in city impact areas, where cities retain advisory rights and additional impact-area rules apply⁵⁶. Incorporated-city regulations may differ from the county rules described here²⁶. Septic permits remain with South Central Public Health District, which serves Jerome County³⁴. The official zoning map includes agricultural, rural-residential, airport, commercial, industrial, city-impact and recreation districts with differing standards²⁷⁷. We could not confirm exact setback distances or minimum dwelling sizes; ask Planning & Zoning for the parcel’s district standards. Before work begins on a structure with approved zoning, the county requires a setback pre-inspection²⁸. Land divisions and preliminary or final plats require an appointment with Planning & Zoning²⁹. Regulated floodplain development requires a floodplain-development permit administered by the Floodplain Ordinance Administrator, after zoning approval³⁰.

How do septic permits work in Jerome County?

South Central Public Health District reviews applications and issues permits for new and repaired septic systems in Jerome County³⁴. The district's Jerome office is at 951 East Avenue H, Jerome, ID 83338; call (208) 324-8838 or email septic@phd5.id.gov³¹. Septic permits were not required before 1971, so an older system may have no permit record⁹. Only 8.9% of Jerome County soils are rated without severe limitations for a conventional drain field, so make septic feasibility an early purchase contingency³². Permit applications must describe proposed water and sewer service and include applicable water, septic, sewer or health-authority approvals; the county materials do not impose universal public-utility connection³³. Ask the district what site evaluation and inspections the particular system will require.

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

We could not confirm a countywide allowance for long-term RV occupancy, private-land camping or tiny-home occupancy in unincorporated Jerome County. Ask Planning & Zoning about the parcel, duration, utility connections and zoning district before placing or occupying an RV or tiny home. Jerome County's published definitions address mobile homes but do not expressly define tiny homes, and a non-exempt structure cannot be used or occupied until the Administrator or Building Official approves a certificate of occupancy¹¹. A tiny structure is not automatically permit-free: a residential structure needs a permit when it exceeds 200 square feet, has electricity or plumbing, or is permanently affixed¹². District rules may control building size, height, lot coverage, yards and use³⁴³⁵. Manufactured homes must be inspected and approved by the authority having jurisdiction before occupancy³⁶.

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

1. Send Planning & Zoning an Information Request to confirm the use and district, then obtain zoning approval before building-permit review²³²⁴.

1. Prepare the site plan, property and structure details, water and sewer documentation, and any required access, fire, irrigation, health and easement approvals²⁴.

1. Check flood status; zoning approval must precede review of a required floodplain-development permit³⁰.

1. Establish septic feasibility and obtain the South Central Public Health District permit; if using a well, obtain an IDWR drilling permit before a licensed driller starts⁹¹⁶.

1. Include the responsible agency’s access permit with the zoning application for new access onto a federal, state or highway-district public street; projects over 150 feet from the main road need a fire-department letter and an approved access road installed before construction³⁷.

1. Complete the county's setback pre-inspection, then apply for building and applicable trade permits²⁸¹²¹⁹.

1. Obtain certificate-of-occupancy approval and a certificate of compliance before using a non-exempt structure³⁸.

What should you check before buying land in Jerome County?

Locate the parcel on the official zoning map and have Planning & Zoning confirm its district, allowed use, setbacks and other dimensional standards²⁷³⁹. If the parcel is being divided, budget time for the applicable plat or land-division process and an appointment with Planning & Zoning⁴⁰. Verify septic feasibility before the purchase becomes final: only 8.9% of county soils are rated without severe limits for a conventional drain field³². Jerome County averages about 10 inches of precipitation annually, and severe drought occurred in 14.9% of years, so document the water source and any water rights⁴¹⁴². A new well requires an IDWR drilling permit and licensed driller¹⁶. Confirm legal road access and any agency permit for a new public-street approach⁴³. Screen for floodplain permitting and budget around an effective property-tax rate of about 0.6% and a median annual bill of $1,623⁴⁴⁴⁵⁴⁶.

Watch-outs

• Small size alone does not exempt a building: attachment, utilities and residential use can trigger building permits even below the 200-square-foot accessory-structure threshold¹.
• Long-term RV occupancy, private-land camping, tiny-home occupancy, minimum dwelling size and exact setback distances remain unconfirmed; ask Jerome County Planning & Zoning about the parcel's district²⁶.
• Qualifying agricultural buildings need zoning and AG siting permits rather than a building permit, plus a recorded attestation barring habitation, employment and other impermissible uses¹⁵⁴⁷.
• An owner-builder's contractor-registration exemption does not waive applicable permits or inspections¹³¹⁴.

Sources

1. Sign Permit Application, quoted and re-checked
2. Chapter 19 — Zoning Permits, quoted and re-checked
3. Septic Records — SCPHD, quoted and re-checked
4. phd5.idaho.gov, quoted and re-checked
5. Chapter 3 - Establishment of Zones, quoted and re-checked
6. Chapter 4 - General Purposes of Zones, quoted and re-checked
7. Chapter 3 - Establishment of Zones, quoted and re-checked
8. phd5.idaho.gov, quoted and re-checked
9. phd5.idaho.gov, quoted and re-checked
10. Chapter 3 — Establishment of Zones, quoted and re-checked
11. Chapter 2 — Definition of Terms, quoted and re-checked
12. Building Department, quoted and re-checked
13. Frequently Asked Questions (FAQ) - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
14. How To Purchase a Trade Permit (Idaho statewide rule), quoted and re-checked
15. Residential Change of Occupancy Packet, quoted and re-checked
16. Wells Overview — Idaho Department of Water Resources, quoted and re-checked
17. Chapter 19 - Zoning Permits, quoted and re-checked
18. Residential Change of Occupancy Packet, quoted and re-checked
19. Frequently Asked Questions (FAQs) - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
20. Chapter 19 — Zoning Permits, quoted and re-checked
21. Jerome County Building Department (jeromecountyid.us)
22. Jerome County Planning & Zoning Department (jeromecountyid.us)
23. Planning & Zoning, quoted and re-checked
24. Chapter 19 - Zoning Permits, quoted and re-checked
25. Chapter 19 — Zoning Permits, quoted and re-checked
26. Jerome County Zoning Ordinance, Chapter 1, quoted and re-checked
27. Zoning Maps, quoted and re-checked
28. Chapter 19 - Zoning Permits, quoted and re-checked
29. Planning & Zoning | Jerome County, ID, quoted and re-checked
30. Chapter 19 — Zoning Permits, quoted and re-checked
31. South Central Public Health District, Jerome Office (phd5.idaho.gov)
32. 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
33. Chapter 19 - Zoning Permits, quoted and re-checked
34. Chapter 3 — Establishment of Zones, quoted and re-checked
35. Chapter 3 — Establishment of Zones, quoted and re-checked
36. Building Archives - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
37. Chapter 19 — Zoning Permits, quoted and re-checked
38. Chapter 19 - Zoning Permits, quoted and re-checked
39. Chapter 19 — Zoning Permits, quoted and re-checked
40. Planning & Zoning, quoted and re-checked
41. Annual precipitation: Bolthole Index county data
42. Share of years in severe drought: Bolthole Index county data
43. Chapter 19 - Zoning Permits, quoted and re-checked
44. Chapter 19 - Zoning Permits, quoted and re-checked
45. Effective property tax rate: Bolthole Index county data
46. Median property tax bill: Bolthole Index county data
47. Sign Permit Application, quoted and re-checked

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.