Eric Kober, writing at City Journal, compares and contrasts housing policy in California and New York.
Here he is part of what he writes about California:
…California’s legislature has also vigorously advocated accessory dwelling units, or additional units—within existing homes and in backyards — built on lots exclusively zoned for traditional single-family detached properties. Beginning in 2017, the legislature enacted bills requiring communities to make building ADUs easier. Such laws, when embraced by local governments, have had a positive impact on cities’ housing supply. In Los Angeles, for example, ADU permits increased from 117 in 2016 to 4,171 in 2018. While pent-up demand partially accounted for this increase, ADUs now comprise 20 percent of units that have received building permits citywide.
Responding to local governments that hinder adding ADUs, the Golden State’s most recent round of legislation — Assembly Bills 68 and 881, combined as one bill — limits burdensome regulations like minimum lot sizes and setback requirements and allows up to two ADUs on every single-family lot. Senate Bill 13, meantime, prohibits owner-occupancy requirements and limits impact fees, which also operate as constraints on supply.
The entire article is worth reading and thinking about, especially as it relates to the State of California’s other attempts to gather the reins of local control to itself.