California ADU Index, 2025

ADU building permits reported to the state, by year
32,174ADU permits in 2025
26.2%of all new homes permitted
3.6xvs 2018
18
19
20
21
22
23
24
25
Top 10 places for ADU permits, 2025
1Los Angeles7,439
2San Diego2,165
3Los Angeles County1,286
4Long Beach644
5San Jose502
6Santa Maria479
7Garden Grove434
8San Diego County400
9Sacramento378
10Glendale371
Source: California HCD Annual Progress Report data (491 jurisdictions reporting). Free to embed. Data and method: BackyardStack California ADU Data