Accessory dwelling units and junior accessory dwelling units.
Summary
AB 956 would expand California’s accessory dwelling unit (ADU) rules by requiring local agencies to ministerially approve up to two detached, new-construction ADUs on a lot with a proposed or existing single-family dwelling, where current law generally requires approval of one. The bill keeps the existing framework for ADUs and junior ADUs in place, including setback, size, height, and rental-term requirements, while broadening the number of detached units that can be approved without discretionary local review. It also makes only nonsubstantive changes to the state’s regional housing need allocation (RHNA) policy language, which continues to express legislative intent to improve the housing-needs planning process.
Impact
The bill would amend Government Code Section 66323, increasing the number of detached ADUs that must be approved ministerially on qualifying single-family lots from one to two. That change would directly affect local planning and building departments by limiting their discretion and creating a new state-mandated local program, though the bill states no reimbursement is required. The measure would primarily affect homeowners, developers, and local governments by making it easier to add housing units on single-family parcels, potentially increasing infill housing supply. Its RHNA-related amendment to Health and Safety Code Section 50515.05 is nonsubstantive and does not appear to change the substance of state housing allocation law.
Sentiment
The bill appears to have generally favorable momentum in the Legislature. It passed committee votes unanimously or by strong margins early on, and it also received a strong Assembly floor vote of 58-4, suggesting broad support for expanding ADU production as a housing-supply strategy. The available record does not include committee transcript debate, but the vote history indicates the measure was viewed positively by most legislators.
Contention
The main point of contention is the bill’s effect on local control and the scope of ministerial ADU approvals. Supporters likely view the change as a straightforward way to increase housing production and streamline approvals, while opponents or skeptics may be concerned about added density, neighborhood impacts, infrastructure strain, and reduced local discretion over design and development standards. The bill’s declaration that no state reimbursement is required could also be a point of concern for local agencies that must implement the new approval mandate without direct state funding.