Planning Commission backs code changes to align with state SB450/SB9 but removes non-state-law additions

The Cupertino Planning Commission on Sept. 9 voted unanimously to forward to City Council a set of municipal‑code amendments intended to align the city’s single‑family development rules with recent state changes around SB9 and SB450 — but the commission directed staff to remove newly introduced administrative items that are not required by state law and return them as a separate agenda item.

Planning staff presented the package as a mix of state‑law compliance and local code cleanups. "These modifications are being brought to you today in an effort to align our municipal code standards with current state law as well as internal practices," project manager Emmy Sugiyama told the commission. Sugiyama said the changes would apply to several chapters of the Cupertino Municipal Code (including title 14 and title 18) and were intended to make standards more objective and easier to apply.

Why it matters: The amendments respond to SB450 (which staff said became effective in early 2025) and affect how the city reviews SB9 projects — duplexes and two‑lot subdivisions in single‑family zones — including timing for approval and which objective standards the city may apply. Under SB450 as described in the staff presentation, the city generally must approve or deny a complete SB9 application within 60 days or the project may be deemed approved. Other code changes in the staff package would harmonize single‑family development standards across R‑1 and RHS zones, revise definitions (balcony, deck, porch, gross lot area), and add two administrative rules: a 180‑day expiration for inactive applications and a restriction limiting demolition where replacement housing is not proposed.

Commission discussion focused on two recurring concerns: the cost and scope of requiring peer review of applicant‑supplied arborist reports, and the proposed 180‑day lapse/expiration rule for inactive applications. Commissioner Fung pressed staff on the arborist peer‑review requirement and the potential cost burden to homeowners. Sugiyama noted the city offers an alternative: applicants may use an arborist retained through the city’s on‑call consultant list, but acknowledged costs vary by project. On the record, a staff member referenced a recent example of an arborist review that cost about $2,000.

Several commissioners also questioned the effect of an application lapse on homeowners. "They're given courtesy notices to let them know that we're looking for more information," Sugiyama said, adding the proposed 180‑day expiration had been adopted internally as a practice in some form but had not previously been codified. Commissioners said they were concerned that codifying expiration could unintentionally force homeowners with legitimate delays to refile and pay new fees.

In response to those concerns, Chair Rao moved to adopt the staff recommendation to advance state‑law changes and editorial corrections, but to remove any additions not required by state law and return those items to the commission as a separate agenda item. The motion — as amended to allow state‑law changes and ordinary spelling/readability corrections to proceed while taking other administrative additions back for separate review — carried unanimously.

What the change will mean next: Staff will forward the SB450/SB9‑related ordinance language to the City Council and will prepare a separate package and public hearing for the non‑state‑law administrative changes (including the 180‑day lapse and the demolition restriction) so the commission and public can review them with fuller exposition of costs and alternatives. Sugiyama said the package also included a recommended finding that the council could find the amendments exempt from CEQA.

Ending: The commission’s action advances state‑required updates to Cupertino’s development code while pausing local administrative additions so staff can return with more detailed cost and implementation information. The City Council will receive the commission’s recommendation at a future council meeting.