Section 455.335 - Rural areas to be mapped; building permit issuance for exempt dwellings limited(1) A county exempting owner-built dwellings and outbuildings in rural areas from the structural code under ORS 455.330 shall designate those rural areas upon publicly available maps of readable scale showing individual property lines.(2) A county ordinance under ORS 455.330 shall provide that no person shall receive a building permit in that county for an exempt owner-built dwelling and outbuildings more than once every five years.