Council holds workshops on SB 9 and ADU rules; staff seeks direction on objective local standards

The Norwalk City Council on March 18 reviewed state laws that alter how single‑family lots may be subdivided under SB 9 and how accessory dwelling units (ADUs) are regulated, and asked staff to return with draft objective standards aimed at limiting neighborhood impacts while complying with state requirements.

Planning staff presented SB 9 background, explaining the law (effective Jan. 1, 2022) allows ministerial approval in many cases for up to two primary dwellings on a parcel and enables an ‘‘urban lot split’’ into two parcels in many single‑family zones. Senior staff explained that the law restricts local discretion in certain cases but does permit cities to impose objective development standards in order to address impacts such as parking, building separation, open space and privacy.

City staff illustrated how SB 9 combined with ADU rules can substantially increase density on existing single‑family parcels — in some examples converting a single house into up to four units on subdivided or split lots — and noted that many of Norwalk’s single‑family zones consist of 5,000‑square‑foot lots where splits could create much smaller parcels. Staff reiterated that some categories are exempt from SB 9, including historic districts and deed‑restricted affordable housing.

Planning staff also reviewed ADU law changes since 2018 and identified key concerns in Norwalk: a sharp rise in ADU inquiries and applications; requests to legalize previously unpermitted garage conversions; multiunit conversions in multifamily buildings; reduced on‑site parking when conversions remove carports or garages; and requests for two‑story ADUs that raise privacy and design compatibility questions. The presentation listed local options staff can pursue subject to state law: limit ADU height, require enclosed off‑street parking when feasible, set minimum building separation (staff suggested 6 feet), set objective window and screening requirements, require mature tree and landscape plantings, and require minimum line‑of‑sight and trash‑storage standards.

At the council workshop several members urged staff to pursue a conservative approach to minimize impacts on neighborhood character and infrastructure. Vice Mayor Jennifer Perez and Councilmember Margarita Rios emphasized the need to protect parking, stormwater and sewer capacity and to monitor county fire code implications — councilmembers cited cases where small additions triggered costly fire‑protection infrastructure upgrades.

Planning Director Alex Hamilton and Senior Planner Sofia Tatlian said staff will draft a city ordinance with as many objective standards as state law allows — the ordinance will be returned to the Planning Commission and council for review. Hamilton noted that some state‑required exemptions limit what municipalities can do, but many of the design and screening standards staff proposed are objective and therefore potentially defensible under state law.

Councilmembers asked staff to provide the workshop slides and to return with a draft ordinance that includes proposed objective standards for setbacks, parking, building separation, open space and landscaping, and guidance on historic‑district designations where applicable.