Delayed ADU Permits: California Court Allows Homeowner’s Damages Claim to Proceed

Shi applied for an ADU permit in 2020, intending to coordinate construction with completion of the family home. He alleged the City required discretionary approvals—including a conditional-use permit and Homes Association Art Jury approval—inconsistent with applicable state ADU requirements. ¹

He alleged approval took more than three years, until 2023, and claimed losses exceeding $1 million, including lost use, increased construction costs, interest, design expenses, and diminished value. Those are allegations, not proven losses or approved categories of recovery. ¹

The trial court sustained the City’s demurrer with leave to amend. Shi declined further amendment, judgment followed, and the Court of Appeal reversed. A demurrer tests pleading sufficiency; accepting properly pleaded facts for that review does not establish their truth at trial. ¹

Ministerial approval means applying governing legal standards without discretionary review or a hearing. Qualifying ADU applications receive statutory protections, but not every submission starts an unconditional 60-day approval clock. ³

When Shi applied in 2020, former Government Code section 65852.2(a)(3) governed. Its 60-day action requirement ran from receipt of a completed application if an existing single-family or multifamily dwelling was on the lot. For an ADU submitted with a new single-family dwelling application, action could be deferred until action on the primary-dwelling permit; applicant-requested delay tolled the clock. ³

The opinion identifies the former provision and its 2024 renumbering, using current section 66317 for clarity because the parties agreed the requirements remained substantially the same. Current section 66317(a)(1)–(3) includes later procedural language; it should not be silently applied to 2020 events. Shi did not decide a completeness date or which timing exception applied. ¹⁴

The court rejected the argument that the duty served only an abstract statewide housing goal. Qualifying permit applicants are direct, intended beneficiaries of timely, ministerial processing—not merely incidental beneficiaries. ¹

Section 815.6 supplies the potential liability framework: an enactment must impose a mandatory duty designed to protect against the particular kind of injury alleged, and breach must proximately cause that injury. The statute also permits the public entity to establish reasonable diligence in discharging the duty. That is not necessarily its only available defense. ²

Shi resolved the protective-purpose element. The court assumed without deciding the relevant mandatory duty and causation because the parties did not dispute them on appeal. Breach, causation, recoverable damages, and applicable defenses remain for further proceedings. The ADU statute does not independently guarantee compensation. ¹

A useful record includes:

Increased costs or lost use need supporting evidence. Elapsed time alone does not prove causation or the amount of damages. Our discussion of proving business-interruption losses explains related documentation principles.

Monetary claims against a municipality generally require claim presentation before suit, subject to statutory exceptions. Sections 905 and 945.4 address presentation and the prerequisite of action on, or deemed rejection of, a required written claim. ⁵⁶

Section 911.2 distinguishes six-month presentation periods for specified death or injury claims from one-year periods for other causes of action. Neither period should be assigned categorically to every ADU-delay claim: the claim’s nature, accrual, and applicable exceptions matter. These deadlines differ from ordinary lawsuit limitations periods. Shi did not resolve presentation compliance or establish permit approval as a universal accrual date. ¹⁵