What is the 60-day rule and how does it protect ADU applicants?

The "60-day rule" is a statutory protection in California's ADU law requiring a permitting agency to approve or deny a complete ADU application within 60 calendar days of receiving it. It exists because, before statewide ADU reform, applicants could wait many months — sometimes more than a year — for a decision. The Legislature put a hard deadline in the Government Code (provisions including sections 66317 and 66320) to stop that.

How the clock actually starts

The 60 days run from receipt of a complete application — not from the day you first walk in the door with a partial set. This is why completeness is so important. A package missing the Title 24 CF1R, a load calculation, or coordinated MEP sheets gets an incomplete notice, and the clock does not start until you cure the deficiency. Submitting a clean, complete package is the single best way to make the 60-day protection work for you.

The newer 15-day completeness clock

Effective January 1, 2026, SB 543 adds a 15-business-day completeness review: the city must review your submittal and notify you of any missing items within 15 business days. If the city fails to act within that window, the application is treated as complete by operation of law. This closes a loophole where agencies could slow-walk projects by never formally accepting them as complete. Pre-approved plan programs can shorten the decision timeline further — some to roughly 30 days.

What "deemed approved" means

If the agency does not act on a complete application within 60 days, the application is deemed approved by operation of law. This is a genuine legal protection, not a courtesy guideline. In practice, you rarely want to rely on automatic approval — it can create title and inspection complications — but its existence gives you real leverage.

The 60-day rule is most powerful as a negotiating tool: a polite, written reminder that the statutory deadline is approaching usually moves a stalled file far faster than an automatic-approval claim ever would.

How to use the protection effectively

• Submit complete. A complete package starts the clock and avoids the incomplete-notice reset.
• Document your submittal date and keep the intake confirmation.
• Respond to corrections promptly. Correction rounds can pause or affect the timeline, so a fast, complete response keeps momentum.
• Send a written reminder as the 60-day mark approaches if no decision has issued, citing the statutory timeline.
• Escalate in writing to a supervisor or the ADU ombudsperson if the deadline passes without action.

An important caveat

The 60-day rule governs the city's building permit decision. It does not control utility timelines — a panel upgrade or new service connection runs on the utility's schedule and can take far longer. The rule also assumes objective, ministerial review; it is not a way to override legitimate health-and-safety code requirements. Requirements and local ordinances vary by jurisdiction, and these timelines were tightened by recent legislation — confirm the current rules with your local building department. To avoid the corrections that eat into your 60 days, start with permit-ready, coordinated plans via our Full MEP Package or read the permit guide.