Planning commission backs limited 250‑sq‑ft ‘de minimis’ fix for nonconforming homes, sends amendment to council

The Palo Alto Planning and Transportation Commission voted 7‑0 on Jan. 14 to recommend a text amendment to the city zoning code that would allow limited "de minimis" relocations of noncomplying floor area for certain single‑family homes.

Assistant Director Armour told commissioners the change responds to a recent building‑permit appeal and would allow up to 250 square feet of noncomplying floor area to be relocated within a structure for single‑family residential uses in low‑density zones. Armour said the 250‑square‑foot threshold aligns with an existing home improvement exception in the code and is intended to avoid extra process or appeals while protecting neighboring properties.

Commissioners conditioned support on clarified language and guardrails. Commissioner Heckman moved the staff recommendation with edits that add a condition that "the noncompliance is not increased," restructure subparts for clearer logical tests (b1/b2), and change the term "modification" to "relocation" in two places. The motion passed unanimously after a roll‑call vote: Gee, Peterson, James, Templeton, Heckman, Vice Chair Chang and Chair Aiken voted yes.

The staff draft, as discussed in the hearing, excludes detached accessory dwelling units (ADUs); Armour said ADUs have their own regulations but the provision could apply to junior ADUs that are within an existing home. Staff also clarified that basements are not counted as residential floor area.

Commissioners debated whether to tie the allowance to gross floor area exceedances only or to allow other nonconformities such as setback encroachments. Attorney Yang and staff said the draft can be written narrowly to limit the rule to floor‑area exceedances or more broadly if the commission prefers; staff offered to prepare clarifying language for council. Yang also explained the intent to make approvals ministerial where possible so applicants may obtain building permits without discretionary review when the objective standards are met.

Several commissioners urged additional safeguards to prevent serial use—moving small amounts of noncomplying area in successive permits to effect larger changes over time—and staff said they could add a limitation such as one use per property if the council desires. Commissioner Peterson also asked whether moving a noncomplying portion between detached structures would be allowed; staff said lot‑merges or other property changes would raise separate legal and planning issues.

The commission’s recommendation, including the edits described at the meeting, will be forwarded to City Council for consideration. Staff said they prepared the ordinance quickly because of an active applicant whose project prompted the change.