Zoning & Land Use  ·  November 7, 2026

City Delayed Your ADU Permit in California? A New Appellate Decision Says the Damages Claim Can Go Forward

You applied for a permit to build an accessory dwelling unit. State law says the city must approve or deny it within 60 days of a complete application, without discretionary review. Instead, the planning department asked for a conditional use permit, sent the plans to a design review board, and took three years. By the time the permit issued, construction costs had climbed and the rental income you planned on never arrived.

Until last month, the usual answer in California was a writ of mandate: a court order telling the city to process the application. Money for the delay was a much harder ask. On October 23, 2026, the Court of Appeal in Los Angeles changed that calculus. In Shi v. City of Palos Verdes Estates (Oct. 23, 2026, B350195), Second District, Division Four, certified for publication, the court held that the ADU statute's ministerial-approval requirement is designed to protect the people who apply for ADU permits, so a homeowner's claim for damages under Government Code Section 815.6 should not have been thrown out at the pleading stage.

This article explains what the ADU statute requires of a California city, what Shi decided and did not decide, what a damages claim against a city involves, and the deadlines that start running the moment a city misses one of its own.

What does California law require a city to do with an ADU application?

Approve or deny it ministerially, within 60 days of a complete application, with no discretionary review and no hearing. Government Code Section 66317 sets the rules, and it is the statute at the center of Shi. Shi appears to be the first published California decision to hold that an applicant can pursue a damages claim against a city that ignores those rules.

The 60-day rule and deemed approval

Section 66317(a)(1) provides that an ADU permit application "shall be considered and approved ministerially without discretionary review or a hearing," notwithstanding the variance and conditional use permit statutes (Government Code Sections 65901 and 65906) and any local ordinance regulating variances or special use permits. "Ministerial" means the agency checks the application against objective standards and issues the permit if they are met; it does not weigh the neighbors' objections or the aesthetics.

Subdivision (a)(3) sets the clock. Where an existing single-family or multifamily dwelling is on the lot, the permitting agency "shall either approve or deny the application" within 60 days from the date the permitting agency receives a completed application. If the agency has not acted within 60 days, "the application shall be deemed approved." If the applicant requests a delay, the 60 days are tolled. If the ADU application is submitted together with an application to build a new single-family or multifamily dwelling on the lot, the agency may delay acting on the ADU until it acts on the new dwelling, but the ADU still gets no discretionary review.

The 15-business-day completeness rule

Because the 60 days run from a completed application, the completeness determination matters. Under Section 66317(a)(2)(A), the agency must decide whether the application is complete and notify the applicant in writing not later than 15 business days after it received the application. An incomplete notice must list the incomplete items and describe how to complete them (subdivision (a)(2)(B)); on resubmission the agency may not demand an item that was not on that list (subdivision (a)(2)(D)); and if the agency misses the completeness deadline, the application or resubmission is deemed complete for purposes of the section (subdivision (a)(2)(F)).

Note the unit. The completeness deadline is 15 business days; the decision deadline is 60 days, not business days. Count the first from receipt of the application and the second from receipt of the completed application.

What a city may not use as a reason to delay

Section 66317(c) provides that no local ordinance, policy, or regulation, other than an ADU ordinance consistent with the state ADU article, may be the basis for delaying or denying an ADU building or use permit. A discretionary design review requirement, a homeowners association art jury, a conditional use permit: none of those are a lawful basis for holding up an ADU permit. If the agency denies, Section 66317(b) requires it to return, within the same 60-day period, a full set of written comments listing each defective or deficient item and how to remedy it. Denials and incompleteness determinations are appealable in writing to the agency's governing body (or, at a city's or county's option, its planning commission) under subdivision (d), which requires a final written determination within 60 business days after receipt of the written appeal.

ROMO Law Group handles zoning and land use disputes across California. For the broader rules on permit deadlines outside the ADU context, including the Permit Streamlining Act and the Housing Accountability Act, see our article on what happens when a California city misses a permit deadline.

What did the California Court of Appeal decide in Shi v. City of Palos Verdes Estates?

That the ministerial-approval and timing requirements in Section 66317 are designed to protect ADU applicants, so an applicant who alleges he was injured by a city's failure to follow them states a claim under Government Code Section 815.6. The decision reverses a judgment entered after the city's demurrer was sustained. It does not decide the merits.

The facts the court accepted as true

Because the case reached the Court of Appeal on demurrer, the court took the homeowner's allegations as true. Wei Shi owns a home in Palos Verdes Estates. He applied for an ADU permit in 2020. He alleged that the city, instead of approving it ministerially, put him through a discretionary process that included a conditional use permit, discretionary review, and approval by a homeowners association art jury, and that a planning commissioner lobbied his neighbors against the project. The city approved the permit in 2023, more than three years after the application. Shi alleged damages exceeding one million dollars: loss of use of his property, increased construction costs, interest expense and the cost of design professionals, and diminished property value.

Shi sued in October 2024 under Section 815.6. The trial court sustained the city's demurrer with leave to amend, reasoning that the ADU statutes were meant to address the state's housing shortage, not to protect an individual builder's investment, and noting that applicants had succeeded with writs of mandate, citing Riddick v. City of Malibu (2024) 99 Cal.App.5th 956. Shi declined to amend, judgment was entered for the city, and he appealed.

The three elements of a Section 815.6 claim

Section 815.6 provides that where a public entity is under a mandatory duty imposed by an enactment that is designed to protect against the risk of a particular kind of injury, the entity is liable for an injury of that kind proximately caused by its failure to discharge the duty, unless it establishes that it exercised reasonable diligence to discharge the duty.

Quoting B.H. v. County of San Bernardino (2015) 62 Cal.4th 168, 179, the Shi court listed the three elements: (1) a mandatory duty was imposed on the public entity by an enactment; (2) the enactment was designed to protect against the particular kind of injury allegedly suffered; and (3) the breach of the mandatory statutory duty proximately caused the injury. The city's only argument, in the trial court and on appeal, was the second element. The court assumed the first and third without deciding them.

Why the court found the statute protects applicants

The city's position, which the trial court had accepted, was that Section 66317 exists to ease the housing shortage, so any benefit to an individual applicant is incidental. The Court of Appeal disagreed. It read Section 66317 as imposing "a mandatory duty on local governments to promptly and ministerially consider and approve ADU permits," and described the intended beneficiaries of that duty as "applicants for ADU permits—people like Shi." Allowing applicants to obtain ministerial approval without discretionary conditions, the court wrote, "is not 'incidental' to section 66317. It is the point of section 66317."

The court relied on the statute's text, on the legislative findings in Government Code Section 66310, which describe ADUs as a valuable form of housing that gives homeowners added income, and on the statement of intent in Section 66311 that local requirements not unreasonably restrict homeowners' ability to build them. It added that the legislative history "also supports our interpretation," but did not rest on it because it found the statute unambiguous. Its conclusion: "In sum, section 66317 was designed to protect against the delays that Shi suffered."

Haggis distinguished, and the "no private right of action" argument rejected

The leading Supreme Court case on the second element is Haggis v. City of Los Angeles (2000) 22 Cal.4th 490, where the duty to record a notice that a bluff-top lot was substandard ran to existing owners, and a later purchaser's benefit was incidental. In Shi, the court said "[t]he facts of Haggis have little to do with this case." Shi was the applicant the duty ran to, not a stranger who later benefited.

The court also brushed aside the argument that Section 66317 does not itself authorize a lawsuit: "it is immaterial that section 66317 does not itself create a private right of action or provide for damages for delays." Section 815.6 supplies the cause of action when its elements are met; the underlying statute does not have to.

What Shi did not decide

The court did not decide that the city violated Section 66317; the allegations were assumed true on demurrer. It did not decide that the city breached a mandatory duty (element one) or that the breach caused Shi's losses (element three). It did not address the reasonable-diligence defense written into Section 815.6, and it did not address any immunity, because the city argued only the second element. It did not say what damages are recoverable. The judgment was reversed, with Shi recovering his costs on appeal, and the case goes back to the Los Angeles County Superior Court for the city to answer and the parties to litigate.

The decision is also new. It was filed October 23, 2026. The city may ask the California Supreme Court to review it; that window runs into early December 2026, and the Supreme Court could also order the opinion depublished. Check its status before relying on it.

Can I sue a California city for money over an ADU delay?

After Shi, a damages claim under Section 815.6 has published appellate support, but it is a lawsuit against a public entity, which brings its own rules on claims, defenses and deadlines. The government claim comes first, the city has defenses the opinion did not reach, and the elements Shi assumed still have to be proved. Here is what a homeowner should expect.

The government claim comes first

Before suing a California city for money, a claimant must generally present a written claim to the city under the Government Claims Act and have it rejected or deemed rejected (Government Code Section 945.4). Section 911.2(a) sets the presentation deadline: six months after accrual for a claim relating to a cause of action for death or for injury to person or to personal property or growing crops, and one year after accrual for any other cause of action. An ADU-delay claim seeks economic losses tied to real property, which reads like "any other cause of action," but no published decision has placed this kind of claim in either category. Present the claim within six months of the earliest date the city can argue your claim accrued, usually the day the 60-day period expired without action. The Shi opinion does not address claim presentation or when such a claim accrues; the city argued only the second Section 815.6 element. Do not read Shi's timeline as a safe harbor. Once the city rejects the claim in writing, the lawsuit generally must be filed within six months of the notice (Government Code Section 945.6(a)(1)). A late claim requires an application for leave to present it, with its own limits.

The city's likely defenses

The reasonable-diligence defense. Section 815.6 relieves the entity of liability if it proves it "exercised reasonable diligence to discharge the duty." Expect the city to argue that its staff were working the file. The applicant's file, with every request for an item not on the original incomplete-items list and every referral to a discretionary body, is the answer.

Permit immunity. Government Code Section 818.4 immunizes a public entity for injury caused by issuing, denying, suspending or revoking a permit, or failing to do so, "where the public entity or an employee of the public entity is authorized by enactment to determine whether or not such authorization should be issued." The California Supreme Court held in Morris v. County of Marin (1977) 18 Cal.3d 901 that this immunity reaches only discretionary permit decisions, not a ministerial duty the entity had no discretion to skip. Section 66317 makes ADU approval ministerial, and Section 818.4 was not argued in Shi, but a city may still argue that particular decisions along the way were discretionary. Shi does not resolve that.

Causation and damages. Expect the argument that market conditions, not the delay, drove up costs and that lost rent is speculative; contemporaneous bids, financing terms and a rental analysis dated to the application period are the proof.

Element one. Shi assumed, without deciding, that Section 66317 imposes a mandatory duty for purposes of Section 815.6. Under Haggis, the enactment must be obligatory rather than discretionary or permissive. Section 66317's repeated use of "shall" is strong, but a city could argue that some steps it took were authorized by a compliant local ADU ordinance. The first thing to examine in any delay case is the city's own ADU ordinance against the state article.

Should I file a writ or a damages claim over a California ADU delay?

Usually the writ first, if the permit is still pending, because it is the tool that gets the permit. The damages claim recovers what the delay cost after the fact; Shi's was filed after his permit issued. The two are not exclusive, but they have different clocks, and the government claim deadline runs whether or not a writ is on file.

The writ: getting the permit

A traditional writ of mandate under Code of Civil Procedure Section 1085 asks the court to order the city to perform a ministerial duty, such as processing an ADU application. In Riddick v. City of Malibu (2024) 99 Cal.App.5th 956, Malibu denied an attached ADU on the ground that it needed a coastal development permit; the Court of Appeal held the city's reading of its own local coastal program was wrong and affirmed a writ directing the city to process the application, though it did not order the permit approved. Deemed approval under Section 66317(a)(3) is a related tool: if the city sat on a complete application for 60 days, the application is approved by operation of law, and a writ can enforce that status. Deemed approval means the application is approved by operation of law; the city still has to issue the permit itself, and a writ can compel it. Do not start construction without the issued permit or a court order. Our permit delay article explains the difference between a Section 1085 writ for failure to act and a Section 1094.5 writ after a hearing.

Deadlines at a glance

What to do first

Pull the complete permit file, including the date-stamped application, every incompleteness notice, and every request for additional material. Compare each request against the original incomplete-items list and against the city's ADU ordinance. Calendar the 60 days from the completed application. Preserve the bids, loan terms and rental projections from the time you applied. If the permit is still pending, consider a demand letter citing Section 66317(a)(3) and deemed approval before filing a writ. If the permit has issued and the delay cost you money, the government claim clock is already running.

Homeowners whose ADU plans are blocked by a homeowners association rather than a city should read our article on HOA restrictions on ADUs in California; the rules and the remedies are different. For larger housing projects facing local resistance, see the builder's remedy in California. If a city has been sitting on your ADU application, contact ROMO Law Group with the application date and the correspondence.

Common questions

This article is general information about California law as of November 7, 2026 and is not legal advice. It does not create an attorney-client relationship. Anyone facing a specific dispute should consult a lawyer about their own circumstances.

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