It is already legal to add an ADU and a junior ADU to a property zoned single-family.  Another bill has passed the California Senate that allows up to four units total  – and to be able to create two parcels, which means they could be sold separately – if the owner agrees to occupy the property for at least three years. Here’s a thorough article on the subject with examples:

https://calmatters.org/housing/2021/08/california-housing-crisis-zoning-bill/

An excerpt:

Senate Bill 9 would technically allow as many as two duplexes, two houses with attached units, or a combination — capped at four units — on single-family lots across California, without local approval.

The bill would allow more building where it’s now illegal, with the intent of reducing California’s fast-rising home prices and increasing access to homeownership through a greater variety of options, according to state Senate leader Toni Atkins, a Democrat from San Diego who introduced the bill and similar versions in the past.

The bill returns to the Senate for expected concurrence on the amendments before heading to Gov. Gavin Newsom’s desk.

A group calling itself Californians for Community Planning Initiative immediately filed a proposed constitutional amendment for the November 2022 ballot to reassert local control over zoning and land-use decisions in opposition to the bill.

But some analysts say the linchpin of the Senate’s housing package would probably have a negligible impact on the California housing crisis, at least in the short-term. As for the nightmare scenario described by opponents? There simply isn’t enough evidence to back that up, either.

That’s because a change to zoning means very little in reality, starting with the number of units that would actually get built, these analysts say.

https://calmatters.org/housing/2021/08/california-housing-crisis-zoning-bill/

Link directly to Senate Bill 9 text:

https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202120220SB9

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