Pergola Footings and Boise's 24-Inch Frost Line

Boise City Code sets the frost line at 24 inches, and the city's patio cover policy requires footings installed to frost depth. HomeGuide puts concrete pier footings at $125 to $300 each. Many newer homes in Meridian, Kuna and Star have a standard patio slab that may not carry post loads, so the builder checks it first. See foundation and footing installation.