ADUs also fueled the county’s reported progress delivering affordable homes needed to meet state housing production goals despite uncertainty on their rents – or even whether they’re being used as housing. …Every eight years, the state gives cities and counties housing development targets to help attack the statewide housing crisis. But what about those ADUs San Diegans plan to use to house family members, vacationers or home offices? Ferguson, 34, said an ADU will allow her family to own a 1,200 square foot home – and stay in San Diego. “Relying on the backyards of the unincorporated residents of the County of San Diego to address the affordability crisis of San Diego is not going to work,” Benvenuto said.