Accessory dwelling units, also referred to as ADUs and “granny flats,” have been available in California only as rentals. But a new law, Assembly Bill 1033, is giving Californians the opportunity to buy and sell them as condominiums.

ADUs come in all shapes and sizes — for example, a converted garage, a small home in the backyard, or, as often seen in San Francisco, an unused portion of the main house, said Assemblyman Phil Ting (D-San Francisco), who drafted the legislation.

Under AB 1033, which was signed into law this week, property owners in participating cities will be able to construct an ADU on their land and sell it separately, following the same rules that apply to condominiums. It gives homeowners more options for building on their property, and “the hope is, it would create more homeownership,” said Ting. CLICK