California ADU Permit Delay Damages: What Shi Decided

A California homeowner’s claim for ADU permit delay damages can proceed after the October 23, 2026, ruling in Shi v. City of Palos Verdes Estates. California’s Second District Court of Appeal reversed the dismissal without deciding liability or awarding compensation. Owners still need to connect a breach of the permitting duty to a legally recoverable loss. Published opinion.

According to the complaint summarized in the opinion, Wei Shi applied in 2020 and received approval in 2023, after the city allegedly imposed discretionary reviews and other requirements. He claimed losses exceeding $1 million, including increased construction costs, interest expense, design fees, loss of use and diminished property value. The court accepted those allegations for purposes of reviewing a demurrer: a challenge to whether the complaint states a legally sufficient claim. They were not findings after a trial. Opinion, pages 2–6.

Why the damages claim can proceed

Shi sought damages under Government Code section 815.6. It requires a mandatory duty imposed by law, a law designed to protect against the kind of injury alleged, and an injury proximately caused by a breach of that duty. A public entity can avoid liability by establishing that it exercised reasonable diligence to discharge the duty. Section 815.6.

Only the protective-purpose element was disputed on appeal. The city argued that the ADU law served the public’s need for housing rather than protecting homeowners against their alleged losses. The court held that permit applicants are direct, intended beneficiaries of the duty to process qualifying ADUs promptly and ministerially—without discretionary review or a hearing. Opinion, pages 6–11.

The court expressly assumed, without deciding, the mandatory-duty and causation elements. Its holding removes the city’s asserted legal obstacle to the claim; it does not prove that every claimed expense resulted from an unlawful delay. Section 815.6 provides the cause of action even though the ADU permitting statute does not itself specify a damages remedy. Shi received costs on appeal, but no damages for the project delay. Opinion, pages 6–11.

The 60-day clock starts with a completed application

For a new application as of October 29, 2026, section 66317 requires approval or denial within 60 days after the permitting agency receives a completed application, when an existing single-family or multifamily dwelling is on the lot. Section 66317(a)(3).

Completeness has a separate deadline. The agency must provide a written determination within 15 business days after receiving the application. An incompleteness notice must identify missing items and explain how to complete the application; failure to make a timely determination results in the application being deemed complete. SB 543’s changes took effect January 1, 2026, as explained in HCD’s March 2026 ADU Handbook, pages 34–35 and 46.

Two provisions affect the 60-day decision period:

• An application submitted with a new primary dwelling: The agency may defer its ADU decision until it approves or denies the application for the new single-family or multifamily dwelling. The ADU review remains ministerial.
• An applicant-requested delay: The 60-day period pauses for the requested delay. Preserve the request and its dates when reconstructing the timeline.

Both provisions appear in section 66317(a)(3).

Shi’s 2020 application arose under former section 65852.2(a)(3), in the version effective January 1, 2020. The opinion uses section 66317 after the 2024 renumbering, explaining that the parties agreed the relevant requirements remained substantially the same. That does not make the newer completeness procedure applicable to his original filing. Opinion, page 3, footnote 3.

Connect the application timeline to each claimed cost

A useful project file pairs a dated application chronology with a cost ledger. Preserve submission receipts, each plan version, completeness notices, correction requests, responses, requests for delay, and approval or denial notices. If a new primary dwelling is involved, retain its application and decision records too.

For each claimed expense, identify what would have happened with timely processing and what actually happened. The following records can help test that connection; the opinion did not establish that these categories will ultimately be recoverable.

Keep ordinary project costs separate from claimed increases. For utility line items, first establish which California ADU utility connection fees apply to the project, then document any additional charge attributed to delay.

Hypothetical example: Assume a 30-day permitting delay pushes back an otherwise achievable construction start by 30 days and triggers a $900 loan-extension fee. The loan agreement and invoice document the charge; the contractor’s original schedule helps connect it to the delay. If the contractor could not have started during those same 30 days anyway, that causal connection becomes less clear.

A damages claim does not establish permission to build

Section 66317 also provides that a completed application is deemed approved when the local agency fails to approve or deny it within the applicable 60-day period. Applying that provision requires resolving the application’s completeness and timing, including any permitted delay. It addresses approval status; section 815.6 addresses liability for injury. Section 66317(a)(3).

Filing a damages claim, or citing Shi, does not establish that a particular project has every approval needed to start construction. Ask the permitting agency to identify the building-permit status and outstanding requirements in writing. For disputed approval status or potential losses, consult a California land-use attorney promptly about government-claim procedures and filing deadlines. Bring the application chronology and the records supporting each claimed cost.