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

At a glance

Building permit

Required for residential remodels and additions and for a structure over 200 square feet, with utilities, or permanently affixed¹

Zoning

Yes; county districts and city impact-area rules can differ by location⁴⁵⁶

Septic permits

South Central Public Health District issues permits for new and repaired systems⁷³

RV living

Long-term occupancy on private land is unconfirmed; ask Planning & Zoning because unincorporated land is zoned⁸

Tiny homes

No specific occupancy rule confirmed; zoning and building-permit rules still apply⁸¹

Owner-builder

No exemption confirmed; ask the Building Department before acting as your own builder⁹

Agricultural building

A conditional path requires zoning and AG siting permits plus a recorded use statement¹⁰

Well permit

An IDWR drilling permit is required before drilling, and the driller must be licensed¹¹

Who to call

Contact details are copied from each office’s official page and were checked against it on September 29, 2026.

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

Yes. For residential work in unincorporated Jerome County, remodels and additions require a permit; a structure also requires one when it is over 200 square feet, has electricity or plumbing, or is permanently affixed to the ground¹. Idaho has adopted statewide building codes with state amendments, including the International Residential Code¹². Electrical, plumbing and HVAC work requires trade permits, although the administering jurisdiction can vary by location¹³. Jerome County has not confirmed a general owner-builder exemption, so ask the Building Department what contractor or homeowner documentation applies before submitting plans⁹. A non-exempt structure or a change in occupancy classification requires certificate-of-occupancy approval before use¹⁴. Agricultural buildings have a conditional route, but still require zoning and AG siting permits plus a recorded statement barring employment, habitation and other nonagricultural uses¹⁰.

Who is the Jerome County building department?

The Jerome County Building Department handles inspection, plan review and investigative services in unincorporated Jerome County¹⁵. Its office is at 300 N Lincoln, Room 200, Jerome, ID 83338, and the main phone is 208-324-9262¹⁵. The separate Planning & Zoning Department is in the same room and can be reached at 208-324-9116 or planning&[email protected]¹⁶. A zoning permit application is generally required for exempt and non-exempt structures unless a specific ordinance exception applies, and the zoning administrator must approve it before the building official reviews the building permit². An incomplete application can be returned without refund after 90 days' notice, while construction must begin within 180 days unless a written extension applies².

Does Jerome County have zoning?

Yes. Jerome County zoning covers unincorporated land and county-administered city impact areas, with additional impact-area rules in a separate ordinance chapter⁴⁵. The official zoning map is part of the ordinance, and uses and standards differ among its named districts⁶. Exact setbacks and minimum dwelling sizes remain unconfirmed, so ask Planning & Zoning to identify the parcel's district and the standards that apply before designing the site. Development governed by the flood ordinance also requires a floodplain development permit, and the relevant zoning permit must receive approval before that floodplain application can be reviewed or issued¹⁷.

How do septic permits work in Jerome County?

South Central Public Health District issues permits for new and repaired subsurface sewage disposal systems in Jerome County³. The district's Jerome office is at 951 East Avenue H, Jerome, ID 83338; call (208) 324-8838 or email [email protected]¹⁸. Idaho DEQ establishes the statewide onsite-wastewater rules, while the public health districts administer them¹⁹. A system cannot receive wastewater until the required final installation inspection, and work that must be prepared for inspection generally requires at least 48 hours of advance notice, excluding weekends and holidays²⁰. Only 8.9% of Jerome County soils are rated without severe limitations for a conventional drain field, so make septic feasibility an early contingency²¹. A permit may also be denied where public or central wastewater treatment is reasonably accessible²².

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

Jerome County's reviewed rules do not confirm a specific countywide allowance for long-term RV occupancy, temporary camping on private land or tiny-home occupancy. Ask Planning & Zoning about the particular parcel, proposed duration, utility connections and zoning district before moving an RV or tiny home onto the site. A tiny structure is not automatically permit-free: residential structures need a permit when over 200 square feet, equipped with electricity or plumbing, or permanently affixed to the ground¹. County zoning standards can regulate building size, height, lot coverage, yards and use by district²³²⁴. Manufactured homes must be inspected and approved by the authority having jurisdiction before occupancy²⁵. Idaho's wildlife-management-area camping limits do not answer whether someone may occupy an RV on private land²⁶.

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

1. Apply to Planning & Zoning first; zoning approval must precede Building Department review².

1. Check flood status; development covered by the county flood ordinance needs zoning approval before the floodplain permit can be reviewed¹⁷.

1. Test septic feasibility and apply to South Central Public Health District for the required septic permit³²¹.

1. If using a well, obtain an IDWR drilling permit before an IDWR-licensed driller starts work¹¹.

1. Apply to the Jerome County Building Department and arrange any separate electrical, plumbing or HVAC permits¹¹³.

1. For a subdivision lot, confirm driveway access from an approved street; a commercial project using the main road needs a Highway Department permit²⁷. An approach onto state highway right-of-way needs an ITD encroachment permit²⁸.

1. Complete required inspections and obtain certificate-of-occupancy approval before using a non-exempt structure¹⁴.

What should you check before buying land in Jerome County?

Identify the parcel on the official zoning map and have Planning & Zoning confirm the district, allowed use and applicable standards⁶. Verify septic feasibility before the purchase becomes final: only 8.9% of county soils are rated without severe limits for a conventional drain field²¹. Jerome County averages about 10 inches of precipitation annually, and severe drought occurred in 14.9% of years, so document the parcel's water source and any water rights²⁹³⁰. A new well requires an IDWR drilling permit and a licensed driller¹¹. Confirm the road authority and access approval: subdivision lots need driveway access from an approved street, commercial projects using the main road need a Highway Department permit, and state-highway approaches need an ITD encroachment permit²⁷²⁸. Finally, screen for floodplain permitting and budget around an effective property-tax rate of about 0.6% and a median annual bill of $1,623³¹³²³³.

Watch-outs

• A small residential structure still needs a permit if it has electricity or plumbing or is permanently affixed, even when it is not over 200 square feet¹.
• Long-term RV occupancy, private-land camping, tiny-home occupancy, minimum dwelling size and exact setbacks remain unconfirmed; ask Jerome County Planning & Zoning because standards depend on the parcel's zoning district⁸.
• An agricultural-building designation does not allow habitation and still requires zoning and AG siting permits plus a recorded use statement¹⁰.
• A non-exempt structure cannot be occupied until the required certificate of occupancy is approved or signed off¹⁴.

Sources

1. Building Department | Jerome County, ID, quoted and re-checked
2. Chapter 19 - Zoning Permits, quoted and re-checked
3. Health Inspections — SCPHD, quoted and re-checked
4. Chapter 3 - Establishment of Zones, quoted and re-checked
5. Chapter 4 - General Purposes of Zones, quoted and re-checked
6. Chapter 3 - Establishment of Zones, quoted and re-checked
7. Septic Records — SCPHD, quoted and re-checked
8. Chapter 3 - Establishment of Zones (2026 county census)
9. (2026 county census)
10. Residential Change of Occupancy Packet, quoted and re-checked
11. Wells Overview — Idaho Department of Water Resources, quoted and re-checked
12. Idaho Adopted Codes (Idaho statewide rule), quoted and re-checked
13. Frequently Asked Questions (FAQs) - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
14. Chapter 19 - Zoning Permits, quoted and re-checked
15. Jerome County Building Department (jeromecountyid.us)
16. Jerome County Planning & Zoning Department (jeromecountyid.us)
17. Chapter 19 — Zoning Permits, quoted and re-checked
18. South Central Public Health District, Jerome Office (phd5.idaho.gov)
19. Septic and Septage (Idaho statewide rule), quoted and re-checked
20. IDAPA 58.01.03 Individual/Subsurface Sewage Disposal Rules (Idaho statewide rule), quoted and re-checked
21. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
22. IDAPA 58.01.03 Individual/Subsurface Sewage Disposal Rules (Idaho statewide rule), quoted and re-checked
23. Chapter 3 — Establishment of Zones, quoted and re-checked
24. Chapter 3 — Establishment of Zones, quoted and re-checked
25. Building Archives - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
26. Public Use of Department Lands and Access Areas (Idaho statewide rule), quoted and re-checked
27. Chapter 8 - Subdivision, quoted and re-checked
28. Types of Right-of-Way Encroachment Permits (Idaho statewide rule), quoted and re-checked
29. Annual precipitation: Bolthole Index county data
30. Share of years in severe drought: Bolthole Index county data
31. Chapter 19 — Zoning Permits, quoted and re-checked
32. Effective property tax rate: Bolthole Index county data
33. Median property tax bill: Bolthole Index county data

Written September 29, 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.