Idaho Falls Fence Guide: Permits, 811 & Wind (2026)

Updated October 24, 2026. This guide is general information, not legal or engineering advice. Rules change, so confirm with the agency listed before you start work.

Quick reference

Topic	What to know	Source
Fence permit	Required for a new fence inside Idaho Falls city limits	City of Idaho Falls FAQ
Corner lots	Fences in the corner sight triangle limited to 3 ft	City of Idaho Falls clear-view handout
Frost depth	30 inches to bottom of footing	Idaho Falls Building Dept. design criteria
Design wind	115 mph ultimate, Exposure C	Idaho Falls Building Dept. design criteria
Before digging	Request locates 2 to 10 business days ahead; marks good for 3 weeks	Idaho DOPL Damage Prevention
Contractor registration	Required for most jobs over $2,000; $300,000 liability minimum	Idaho DOPL; Idaho Code 54-5205
Canal easements	Written permission needed for fences on irrigation easements	Idaho Code 42-1209
Lawful fence	At least 4 1/2 ft high, bottom no more than 20 in. up	Idaho Code 35-101

How does the climate affect a fence here?

Idaho Falls sits at about 4,700 feet on the upper Snake River Plain, where the river cuts a black basalt gorge through downtown. The climate is semi-arid with cold winters: about 37 inches of snow a year on average, and a record low of 51 degrees below zero. The city's Building Department sets a 30-inch frost depth for footings and designs for a 115 mph ultimate wind speed in open Exposure C terrain. For a fence, that means posts deep enough to stay below frost, footings shaped so frost can't grab and lift them, and posts, rails and gate hardware sized for strong wind. Ask any contractor exactly how deep they set posts and what they use to reinforce them.

Do I need a permit in Idaho Falls?

Yes, for a new fence inside city limits. The City of Idaho Falls FAQ says a fence permit is required so staff can review the plan for code compliance, and that it typically takes about ten minutes at the front counter. City ordinances limit fence type and height in front yards and near driveways, intersections and alleys. A city handout on clear-view areas describes a 30-foot sight triangle on corner lots where fences can't exceed 3 feet, a similar 15-foot triangle where driveways and alleys meet a street, 2 feet of clearance at the sides and rear of utility transformers, and 3 feet of access around fire hydrants. Contact the Building Division or Planning Division to confirm current rules for your lot.

What about Ammon, the county and other towns?

Ammon, Iona, Ucon, Rigby and Shelley are separate cities with their own rules. Unincorporated Bonneville County addresses go through Bonneville County Planning and Zoning, which handles building permits and zoning through its online portal. Rigby is in Jefferson County and Shelley is in Bingham County, each with its own offices. Pool barriers and masonry walls are more likely to need a building permit wherever you live.

Do HOA covenants matter?

Often more than city rules. Many subdivisions in Idaho Falls, Ammon and Iona have covenants that set fence height, material and color, and some require architectural approval first. The HOA can enforce its covenants even if the city approved your permit, so get the current rules before you collect quotes.

Who has to call 811?

Whoever is digging. Idaho's damage prevention rules call for a locate request at least 2 and no more than 10 business days before excavation, and the dig area should be outlined in white paint. Wait until the legal start time on the ticket and confirm every listed utility has responded. Locate marks are good for up to 3 weeks. Water and sewer owners mark only up to the meter, so lines from the meter to the house, sprinkler lines and power to a shop need a private locator. If you hire a contractor, both names should be on the request.

Does a fence contractor need to be registered?

In most cases, yes. Idaho requires anyone doing a construction job over $2,000 in total labor and materials to register as a contractor with the Division of Occupational and Professional Licenses, unless an exemption applies. Registration requires proof of general liability insurance of at least $300,000 and proof of workers' compensation coverage or a reason it isn't required. Registered contractors must show their registration number on contracts and advertising. Homeowners working on their own residence are exempt, but splitting a job into small contracts to dodge the threshold isn't allowed.

Can I fence along an irrigation canal?

Only with permission if the fence would be on the canal's easement. Idaho Code 42-1209 says no one may place fences, gates or other encroachments on the easements or rights-of-way of irrigation districts, canal companies, lateral ditch associations or drainage districts without the entity's written permission, which can't be unreasonably withheld. Unapproved encroachments that interfere with the ditch can be ordered removed at the owner's cost.

What is a lawful fence?

Idaho Code 35-101 defines a lawful fence as at least 4 1/2 feet high, with the lowest part no more than 20 inches above the ground and the space between sufficiently subdivided. If you keep animals or share a division fence with a neighbor, ask your contractor to build to that standard.

Questions to ask a fence contractor

What is your Idaho contractor registration number?
How deep will you set posts, and what reinforcement will you use?
Who pulls the permit and who requests the 811 locate?
Have you checked my HOA rules and any canal easement?
What does the warranty cover, and for how long?

Common questions

Do I need a permit for a fence in Idaho Falls?

Inside city limits, the city's FAQ says new fences need a permit. Ammon, other cities and the counties have their own rules, and HOAs may require approval too.

How deep should fence posts go in Idaho Falls?

The city's Building Department uses a 30-inch frost depth for footings. Ask your contractor how deep they set posts for your fence height and wind exposure.

How far ahead do I call 811 in Idaho?

At least 2 and no more than 10 business days before digging. Marks are good for up to 3 weeks.

Idaho Falls fence guide (2026)