No. Generally, building permits still are not required in the unincorporated areas of Delta County. However, development must comply with standards in the Delta County Land Use Code (e.g. setbacks), and lands within the Highway 92 Overlay require a building permit. Also, Electrical and Plumbing permits are required through the State Division of Professions and Organizations (DPO), Well permits are required through the State Division of Water Resources (DWR), and Septic permits are required from the County Health Department.
Delta County adopted a Land Use Code, but has not adopted Building Codes. These are separate regulations where Land Use Codes provide direction of what can occur where, and Building Codes provide minimum specifications how a structure must be built.