A push for more ADUs has hit the Bay Area and Southern California. Vast areas of San Diego County could be next.

The unincorporated parts of San Diego County are in the middle of an ADU boom — and even more could be coming.

An effort is underway to rewrite the county’s ordinance for accessory dwelling units to allow owners to sell the units as condos in unincorporated areas, a policy shift made possible by a new state law looking to boost homeownership through ADUs.

If adopted, San Diego County would be the second county in California, after San Francisco, to opt into an ADU sales program under the 2023 law known as Assembly Bill 1033.

RELATED: San Jose makes it legal to sell your ADU separately from your home

A handful of other cities like Santa Cruz and San Jose have opted in, and the city of San Diego backed an identical measure as a part of a package of reforms to its ADU rules in June