Walkouts on the Wasatch Back are built for snow first. Park City averages about 121 inches a year at nearly 7,000 feet, and Heber City about 75 inches at 5,600 feet, so stairwells here collect far more melt than valley walkouts do.
Two counties share the area. Homes inside Heber City, Midway or Park City go through that city's building department, and unincorporated land goes to Wasatch County or Summit County. Wasatch County's design criteria list a 36-inch frost line and send builders to the Utah Snow Load Study for site snow loads, so footing depth and loads get set address by address.
Many homes here sit empty for weeks at a time: more than half of Park City's housing units were vacant at the 2020 census. A walkout nobody checks for a month needs extra capacity and a basin that is easy to clear on your return. US-40 and US-189 carry our equipment into the Heber Valley, and winter is a good time to finish engineering and permits so digging can start when the ground allows.