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

At a glance

Building permit

Required for construction valued at $100 or more in unincorporated areas¹

Zoning

Yes; rules vary by zoning district²³

Septic permit

Eastern Idaho Public Health permit, site evaluation and final inspection required⁵⁶

Well permit

IDWR drilling permit and an IDWR-licensed well driller required⁷

R-1 lot rules

At least 8,000 square feet per single-family dwelling, with a 30-foot minimum front yard⁸⁹

A-1 lot size

At least 1 acre for each dwelling¹⁰

Owner-builder

Registration exemption for owners working on their own land who do not intend to sell within 12 months¹¹

Who to call

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

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

Yes. A building permit is required before constructing a building valued at $100 or more in unincorporated Bonneville County¹. Constructing, altering, reconstructing or moving a building or structure also requires a written permit from the Zoning Administrator before work begins¹². Agricultural buildings are exempt from the county's adopted building codes only if they meet the International Building Code definition of an agricultural building and the County Assessor has determined the land is actively devoted to agriculture; they still follow zoning placement rules¹³. The separate permit exception for a barn, corral, coop or pen requires exclusive agricultural use and a completed value below $100¹⁴. The county has adopted the 2018 editions of the International Building Code and International Residential Code, the 2023 National Electric Code and the 2017 Idaho State Plumbing Code¹⁵. Electrical, plumbing and HVAC work requires trade permits, and Bonneville County has processed electrical and plumbing permits and performed their inspections since January 20, 2026¹⁶. Idaho exempts owners who do their own work on their own land, and do not intend to sell within 12 months, from contractor registration, but that exemption does not waive Bonneville County building permits or other permit requirements¹⁷. We could not confirm a universal county inspection rule for every type of building; ask Planning, Zoning and Building what inspections your permit will require¹⁸.

Who is the Bonneville County building department, and how do you reach them?

Bonneville County Planning, Zoning and Building is at 357 Constitution Way in Idaho Falls and can be reached at (208) 524-7920 or bonnevillebuilding@gmail.com¹⁸. The office is open weekdays from 8 a.m. to 5 p.m., excluding holidays, and its mailing address is 605 N Capital Ave, Idaho Falls, ID 83402¹⁸. A building-permit application must include a plat showing the size and location of existing and proposed buildings and the parcel's zone¹⁹. Bonneville County's permitting portal also accepts electrical and plumbing applications¹⁸. Building permit fees follow a schedule adopted by the Board of County Commissioners and may be based on the building's value for alteration or reconstruction, so request the current amount for your project²⁰.

Does Bonneville County have zoning?

Yes. Bonneville County maintains an official zone map for zoning that applies primarily in unincorporated county territory². The code includes agricultural, residential-agricultural, residential, manufactured-home, commercial, industrial and other districts, and the controls vary by district³. An A-1 dwelling needs at least 1 acre, while an R-1 single-family dwelling needs at least 8,000 square feet¹⁰⁸. An R-1 single-family dwelling also needs a front yard of at least 30 feet, subject to the code's stated exception⁹. Structures in R-1 may cover no more than 40% of the lot²¹. The R-1 height rule refers to the RA-1 standard, whose numeric limit we could not confirm; ask Planning and Zoning for the parcel's full setback and height controls²²²³.

How do septic permits work in Bonneville County?

Eastern Idaho Public Health is Bonneville County's septic permitting and inspection authority⁴. Submit the application, payment, a scaled or dimensional plot plan and building plan; an Environmental Health Specialist evaluates the site before issuing the permit⁵. The individual-system fee is $900, and the permit remains valid for 2 years with a $50 renewal²⁴. The septic permit is required before Bonneville County will issue the building permit⁵. Call for final inspection with 48 hours' notice, and do not cover the tank or drainfield first; a covered system must be uncovered⁶. Homeowners may install only standard or basic alternative systems themselves²⁵. About 28% of mapped soils avoid a “very limited” rating for conventional drain fields, so the site evaluation may shape both system design and land cost²⁶. Reach Environmental Health at (208) 523-5382²⁷.

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

We could not confirm a Bonneville County rule that generally allows or prohibits living in an RV or tiny home on private land. Bonneville County publishes separate agricultural, residential, manufactured-home, commercial and other zoning districts, so ask Planning and Zoning whether the proposed use is allowed in the parcel's district³²³. A tiny home used as an R-1 single-family dwelling would need a lot of at least 8,000 square feet and a front yard of at least 30 feet, subject to the setback exception in the code⁸⁹. Idaho wastewater guidance may let an accessory dwelling combine flows with another structure when septic capacity is sufficient, but that guidance does not grant local zoning permission²⁸. A manufactured home must be inspected and approved before occupancy²⁹.

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

1. Ask Planning and Zoning to locate the parcel on the county zone map and identify its allowed use, lot size, coverage, height and setback rules²³²³.
2. Apply to Eastern Idaho Public Health with payment, site and building plans; complete the site evaluation and obtain the septic permit before seeking the building permit⁵.
3. If you need a well, obtain an IDWR drilling permit and use an IDWR-licensed well driller; some non-domestic wells also need approved water rights before approval⁷.
4. Submit the building application with a plat showing existing and proposed buildings and the parcel's zone¹⁹.
5. Obtain the written building permit before construction and get the electrical, plumbing and HVAC permits required for the work¹²³⁰.
6. Schedule the county's electrical and plumbing inspections and the health district's final septic inspection before covering the septic system³¹⁶.
7. If the driveway enters a state highway, obtain an ITD encroachment permit before work in the right-of-way³².

What to check before you buy land in Bonneville County

Confirm the zoning district before making an offer because minimum lot size varies sharply: an A-1 dwelling needs at least 1 acre, while an R-1 single-family dwelling needs 8,000 square feet and a front yard of at least 30 feet, subject to the code's setback exception¹⁰⁸⁹. About 28% of mapped soils avoid a “very limited” rating for a conventional septic drain field, so make the health district's site evaluation part of due diligence²⁶⁵. A well requires an IDWR drilling permit and an IDWR-licensed driller; irrigation, commercial, industrial, injection, multifamily and municipal wells require at least approved water rights before approval⁷. About 53.7% of Bonneville County is federal land, so verify legal and physical access rather than assuming an adjoining road or track is available³³. An existing lot of record is entitled to only one point of access to an arterial, section-line or major collector road, and more may be approved only during platting³⁴. Ask Planning and Zoning about flood status and private-land RV or tiny-home occupancy, which we could not confirm²³.

Watch-outs

• Bonneville County handles electrical and plumbing permits and the inspections tied to those permits³¹¹⁸.
• A septic permit must come before the county building permit, and the tank and drainfield must remain uncovered until final inspection⁵⁶.
• R-1 and R-1.5 are different zoning districts with different controls; have Planning and Zoning identify the exact district before relying on a lot-size, coverage or height number³³⁵²³.

Sources

1. § 156.086 Permits Required; Exceptions, quoted and re-checked
2. Chapter 156: Zoning, quoted and re-checked
3. Chapter 156: Zoning, quoted and re-checked
4. Septic | Eastern Idaho Public Health, quoted and re-checked
5. Septic Permit Information Sheet, quoted and re-checked
6. Septic Permit Information Sheet, quoted and re-checked
7. Well Construction & Drilling, quoted and re-checked
8. § 156.247 Area, quoted and re-checked
9. § 156.249 Front yard, quoted and re-checked
10. § 156.129 Area, quoted and re-checked
11. Frequently Asked Questions (FAQ) - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
12. § 156.086 Permits Required; Exceptions, quoted and re-checked
13. § 150.01 Codes Adopted, quoted and re-checked
14. § 156.086 Permits Required; Exceptions, quoted and re-checked
15. § 150.01 Codes Adopted, quoted and re-checked
16. Planning and Zoning | Bonneville County, quoted and re-checked
17. dopl.idaho.gov, quoted and re-checked
18. Bonneville County Planning, Zoning and Building (bonnevillecountyidaho.gov)
19. § 156.086 Permits Required; Exceptions, quoted and re-checked
20. § 156.088 Building Permits Required; Fees, quoted and re-checked
21. § 156.253 Lot Coverage, quoted and re-checked
22. § 156.252 Height of buildings, quoted and re-checked
23. Bonneville County Planning and Zoning (bonnevillecountyidaho.gov)
24. Septic | Eastern Idaho Public Health, quoted and re-checked
25. Septic Permit Application Packet, quoted and re-checked
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. Eastern Idaho Public Health, Environmental Health (eiph.id.gov)
28. Idaho DEQ - Uncommon Wastewater Flows (Idaho statewide rule), quoted and re-checked
29. Building Archives - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
30. Frequently Asked Questions (FAQs) - Division of Occupational and Professional Licenses (Idaho statewide rule), quoted and re-checked
31. bonnevillecountyidaho.gov, quoted and re-checked
32. Types of Right-of-Way Encroachment Permits (Idaho statewide rule), quoted and re-checked
33. Federal land share: Bolthole Index county data
34. § 156.059 Access Requirements to County Roads, quoted and re-checked
35. § 156.272 Height of Buildings, quoted and re-checked

Written October 10, 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.