Before You Build in Idaho Falls, ID: Permit & Rule Checklist (2026)

Idaho Falls's zoning code sets no general numeric height cap for residential fences. The only height rule limits fences to three feet (3') within fifteen feet (15') of a front lot line abutting a street, plus clear-view-triangle limits at corners, alleys, and driveways.

Idaho Falls requires a fence permit before building a new fence. The city's FAQ states a $5 fence permit is required so staff can verify compliance with height and visibility rules. The review is a brief over-the-counter process at the Building Division.

Idaho Falls's zoning code does not assign shared-fence cost or boundary-line ownership; those are matters of Idaho state law and private agreement. The city's permit review and clear-view rules indirectly protect neighbors by keeping fences out of sight triangles near corners and driveways.

Idaho Falls's zoning code contains no retaining-wall provisions. Retaining walls are regulated as building work under the city's adopted 2018 International Residential Code (City Code 7-6-1). Under the IRC, walls over four feet high (or any wall supporting a surcharge) generally require a building permit.

Idaho Falls does not mandate or ban particular fence materials for residential properties. Common materials, wood, vinyl, composite, masonry, and chain-link, are generally allowed. Material matters mainly where the code distinguishes chain-link (non-sight-obscuring) or requires 'opaque' screening fences for certain commercial buffers.

Idaho Falls requires a building permit for in-ground and most pool construction under the city-adopted 2018 International Residential Code. Prefabricated pools no greater than 4 feet deep are exempt from a building permit, but the city's zoning fence and setback rules still apply to every pool.

Under Idaho Falls Zoning Code Section 11-4-8(D), any swimming pool not fully enclosed in a solid-walled building must be completely surrounded by a fence at least five feet high with no openings wider than 36 square inches. Self-closing, self-latching gates are exempt from the opening limit.

Idaho Falls pool safety comes from two sources: the Zoning Code's five-foot perimeter fence and setback in Section 11-4-8(D), and the city-adopted 2018 International Residential Code enforced by the Building Division, which covers barriers, gates, and pool electrical and structural safety.

Idaho Falls exempts prefabricated pools no greater than 4 feet deep from a building permit under City Code Section 7-6-2(C), but every swimming pool, including above-ground pools, must still meet the Zoning Code's five-foot fence and five-foot property-line setback in Section 11-4-8(D).

Idaho Falls regulates outdoor hot tubs and spas mainly through electrical safety. The city's handout requires GFCI protection and follows NEC Article 680 for bonding, switch and receptacle clearances, and overhead-line distances. Spa structures and any barrier requirements are reviewed under the adopted 2018 IRC.

Idaho Falls does not allow a garage to be converted into an accessory dwelling unit unless the required off-street parking is provided elsewhere on the lot. Any habitable conversion must meet Title 11 zoning, parking minimums, and city building permit requirements.

Idaho Falls allows accessory dwelling units in low-density (RP, R1) and medium-density (RMH) residential zones under Title 11 of the Municipal Code. ADUs are capped at 750 square feet, require owner-occupancy of one unit on the lot, and must provide one additional parking space.

In Idaho Falls, any detached structure over 120 square feet that houses property, equipment, or people needs a building permit. Even permit-exempt sheds must meet Title 11 zoning setbacks, including a three-foot rear yard in residential zones, and accessory buildings cannot cover more than 30% of the rear yard.

Carports and patio covers in Idaho Falls require a building permit because of eastern Idaho's snow and wind loads. As accessory structures they must also satisfy Title 11 zoning setbacks and keep front, rear, and side yards open and unobstructed.

Idaho Falls has no separate tiny-home category; a permanent tiny house on a foundation is treated as a dwelling and a backyard tiny home is treated as an accessory dwelling unit, capped at 750 square feet in RP, R1, and RMH zones. RVs and recreational-vehicle tiny homes cannot be used as dwellings.

Open burning is prohibited inside Idaho Falls City limits unless a Fire Code Operational Permit is obtained first. Burning leaves, trash, construction debris and yard cleanup is illegal, and burn barrels are strictly prohibited - no permits are issued for that. Bonfires and irrigation/weed-control fires require a permit; Idaho DEQ also regulates air-quality burn conditions.

Recreational fire pits are legal inside Idaho Falls City limits when weather and air quality allow. Per the Idaho Falls Fire Department, the fire must be no larger than 3 feet in diameter and 2 feet high, kept 25 feet from structures (15 feet for a portable outdoor fireplace), constantly attended, and have a 4-A extinguisher available.

Idaho Falls property owners must keep trees clear of public ways: 8 feet over sidewalks, 13 feet over curbs, and 15 feet over the street/alley centerline. Pruning public/street trees needs City permission, and tree-service firms must be City-licensed.

Removing a private tree on your own property generally needs no City permit in Idaho Falls. But removing or cutting any public or street tree requires written permission from the Director or City Forester, and abuse of public trees is unlawful under City Code 8-9-9 and 8-9-12.

Idaho Falls runs its own municipal water utility drawing from the Snake River Plain aquifer. There is no fixed odd/even watering schedule, but City Code 8-4-8 bans wasting water and prohibits irrigation by open hose. In a shortage, the Mayor may proclaim mandatory limits (8-4-9).