Do I need a permit for residential demolition in Unincorporated Rich County?

Most likely yes. Residential demolition usually requires a permit in Utah. Confirm the specifics with Unincorporated Rich County.

Structures must be inspected for asbestos by a Utah certified inspector before demolition, except residential buildings with four or fewer units built on or after January 1, 1992 that have never been and will not become a NESHAP facility; friable asbestos found must be removed by a Utah certified asbestos contractor first (Utah Division of Air Quality). A Demolition Notification Form must be accepted by the Division of Air Quality before work starts, with a minimum ten working day wait after submittal; this still applies to homes built after 1991. Demolition in Box Elder, Cache, Davis, Salt Lake, Tooele, Utah, and Weber counties requires a fugitive dust control plan. Before digging, the excavator must notify underground facility operators through the statewide Blue Stakes association at least 48 hours, and not more than 14 days, before excavation begins (Utah Code 54-8a-4). This job demolishes a home or a structure with active water, sewer, gas or electrical service. Utilities normally must be disconnected and capped by the utility or a licensed trade before demolition, and departments commonly require proof of that before issuing a demolition permit. Ask your department and your state environmental agency whether an asbestos or lead survey is required before demolition, and whether a sewer cap inspection applies.