Service area · Bonneville County
These two pages exist for one reason: the jurisdiction question here does not have an obvious answer, and getting it wrong costs weeks in a short build season.
Mon–Fri 8am–5pm · Idaho Falls and the surrounding towns
Send the address and the size you have in mind. You’ll get the design load your jurisdiction requires and the office that permits it.
Iona is a city of 2,717, four miles northeast of the Idaho Falls airport station. Ucon is a city of 1,160, six miles northeast. Both are small enough that the practical first question is not what to build — it is who handles the paperwork.
Bonneville County Planning & Zoning, at 605 N Capital Avenue, (208) 524-7920, covers the unincorporated county under §156.086. A zoning permit is required for any structure with a completed value of $100 or more — a threshold no real building gets under.
Confirm with the county which office covers your specific parcel before you design anything. Small-city arrangements vary, they change, and this is exactly the kind of detail that is not published clearly anywhere. One phone call is worth more than any page on the internet, including this one.
Also worth knowing: as of January 20, 2026, Bonneville County took over electrical and plumbing permits from the State of Idaho. Those no longer go where they used to. If a shop includes power, that change affects your filing.
Verify jurisdiction for your specific parcel by phone. City and county coverage in this area is not documented consistently online.
In the 2015 University of Idaho study, Iona carries 23 psf at 4,783 feet and Ucon carries 25 psf at 4,807 feet. So far, so predictable.
Then look at the neighbors. Menan at 4,803 feet carries 30. Roberts at 4,777 feet carries 33. Those four towns sit inside 30 feet of each other vertically and span ten pounds per square foot.
The lesson is the same one the whole area teaches: elevation alone does not set the number, and a truss package priced off the next town’s figure is priced off the wrong figure. Footings still reach the 30-inch frost depth regardless. Full table by town →
Post-frame shops from 24x32 up, sized around door height, truss spacing and the snow load your jurisdiction adopts.
Added bays and covered wings, where drifting snow against the taller wall raises the design load on the lower roof.
Send the parcel address and the size you have in mind. You'll get the office that actually covers you, the ground snow load in force there, and what the current permit process looks like.