Service area · Jefferson County
Rigby is a city of 5,038, and the first surprise on a Rigby project is administrative: the building permit does not come from the city.
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.
Jefferson County Planning, Zoning & Building issues Rigby’s building permits. The department’s own page states that it serves the unincorporated county “and also serve the cities of Lewisville, Menan, and Rigby.”
That arrangement is not what most people assume about an incorporated city of this size, and it is worth confirming before you order anything. A set of drawings sitting at the wrong counter is a delay, not a rejection, but it is a delay in a build season that does not have spare weeks in it.
Jefferson County’s Ordinance 2017-01 amends the IRC table for local conditions: a 30-inch frost depth and a winter design temperature of −4°F.
Confirm before you rely on it: those Ordinance 2017-01 figures come from a scanned county PDF. Call the department and have them confirmed by phone before they are treated as settled for your permit.
Verify current requirements with the department. Ordinance figures above are read from a scanned document.
Rigby sits at 4,851 feet and carries 32 psf in the 2015 University of Idaho ground snow load study. Idaho Falls, 126 feet lower, carries 23 psf in the same study.
Nine pounds per square foot across a 2,400 square foot roof is not a rounding item — it is truss depth, web layout and steel gauge. This is the practical reason a bid quoted off an Idaho Falls address does not transfer to a Rigby parcel. Loads by town →
Jefferson County runs 679 farms across 262,180 acres, and 62% of them are under 50 acres — 193 farms in the 1 to 9 acre band and 231 in the 10 to 49 acre band. Potatoes and vegetables account for $90.7 million, cattle $74.5 million.
That acreage distribution matters for one specific reason: an agricultural building exemption exists, but it turns on acreage and use tests, and the terms differ by county. No verified acreage threshold for Jefferson County is published here, so treat the exemption as a question to settle rather than an assumption — confirm the threshold and the use test with Jefferson County Planning, Zoning & Building at (208) 745-9220 before you rely on it. What the ag exemption covers →
Water is the reason any of this ground farms at all. The Great Feeder Canal, first diverted from the Snake River on June 22, 1895, still heads roughly 40 irrigation diversions. Buildings on this ground get sited around canals, laterals and their easements, and that is a setback question worth raising with the county early.
Post-frame shops from 24x32 up, sized around door height, truss spacing and the snow load your jurisdiction adopts.
Hay, livestock and implement structures, where the permit path differs from a residential accessory building.
Send the parcel address and the footprint you want. You'll get the department with jurisdiction, the ground snow load in force, and the frost depth your footings have to reach.