ADU Permit Delays: Cities Can Owe Damages, Court Rules

Informational only, not legal advice. ADU rules change often and differ by city. Confirm with your local planning department before you rely on anything here.

On October 23, 2026, the California Court of Appeal ruled in Shi v. City of Palos Verdes Estates that a homeowner can sue a city for damages when it ignores the state's ADU permit deadline. Wei Shi applied for an ADU in 2020; the city did not approve it until 2023. The Second District, Division Four, reversed a trial judge who had thrown the case out, and certified the opinion for publication. Until now, the usual remedy was a court order forcing approval.

What happened in Palos Verdes Estates

According to the complaint, which the court accepts as true at this stage, Shi wanted to finish his ADU alongside a new family home on the same lot. Instead of a ministerial building permit, the city told him he needed a conditional use permit, discretionary review and sign-off from the Palos Verdes Homes Association Art Jury.

The permit came through in 2023, more than three years after he first applied. Shi sued in October 2024 under the Government Claims Act, claiming losses he estimates at more than $1 million: loss of use of the property, higher construction costs, interest, design fees and lower property value.

The city did not argue it met the deadline. It argued only that the ADU statutes protect the public, not individual homeowners, so Shi could not sue. The trial court agreed and dismissed the case. HCD had separately found, in April 2024, that the city's ADU ordinance did not comply with state law.

What the court decided about the 60-day ADU deadline

The appeal turned on two statutes. Government Code section 66317 says an ADU application "shall be considered and approved ministerially without discretionary review or a hearing," and that the city must approve or deny a complete application within 60 days when a home already exists on the lot. It also says no local rule other than a compliant ADU ordinance can be the basis for delay or denial.

Government Code section 815.6 makes a public agency liable when it breaks a mandatory duty that was designed to protect against a particular kind of injury, unless it shows it used reasonable diligence to meet that duty.

Justice Nicholas Daum, joined by Presiding Justice Zukin and Justice Mori, held that section 66317 easily meets that test. The court said permit applicants "are the direct and intended beneficiaries of the relevant duty," and that ministerial approval without burdensome local rules "is the point of section 66317." It also cited the history of SB 1069 (2016), the bill that first made ADU approval ministerial, which described local governments placing "onerous requirements" on people building these units.

That the ADU statutes never mention damages did not matter: section 815.6, not the underlying statute, creates the right to sue.

What the ruling does not do

• It does not award any money. The case goes back to the trial court, where Shi still has to prove the delay caused his losses.
• The city can still argue it used reasonable diligence.
• The city could still ask the California Supreme Court to review the decision. As a published opinion, it binds trial courts statewide unless another appellate court disagrees.

How to protect your ADU permit timeline

A damages claim is the last resort; the ruling matters most because cities now have a reason to keep their clocks honest. What we do on every job:

1. Get a date-stamped intake. The 60 days run from when the city receives a complete application. Keep the receipt, the portal screenshot and every correction letter.
2. Put requests in writing. If a planner asks for a use permit, a hearing, HOA design approval or a neighbor sign-off for a compliant ADU, ask them to cite the code section, and cite section 66317 back.
3. Track the clock. Under state law, if a complete application is not approved or denied within 60 days, it is deemed approved. Check your city's ADU ordinance for how it handles this.
4. Know the claim deadline. Before suing a public agency for damages you generally must file a written claim with it first, within six months or one year depending on the claim. A land-use attorney should confirm the deadline for your situation.

Our guide to the California ADU permit process walks through what a complete application looks like, and AB 1621 adds limits on plan-check rounds for housing permits starting in 2027.

What it means for SB 9, SB 684 and multifamily ADUs

The opinion is about section 66317, so it covers every ADU type that law requires cities to approve: the ADU and JADU combinations on single-family lots, the two detached units AB 956 allows from 2027, and the detached and conversion ADUs on apartment lots under SB 1211.

Law professors and housing advocates quoted in coverage of the case expect builders to try the same reasoning on other ministerial laws, including SB 9 lot splits and SB 684 and SB 1123 small-lot subdivisions. No court has said yes to that yet, and each statute's wording will matter.

Our recommendation: design to state law, file a clean and complete application, and document every step. If you check your address in Parcy, the ADU pathway shows which state rules apply to your lot, which is what you need to show a city its extra requirements do not belong in your permit.

Frequently asked questions

Can I sue my city for an ADU permit delay in California?

Under Shi v. City of Palos Verdes Estates (2026), a homeowner can state a damages claim under Government Code section 815.6 when a city breaches its mandatory duty to approve a compliant ADU ministerially and on time. You still have to prove the delay caused your losses, and the city can defend by showing it acted with reasonable diligence.

How long does a California city have to approve an ADU permit?

Government Code section 66317 requires the permitting agency to approve or deny a complete ADU application within 60 days when there is already a home on the lot. If the ADU is filed with a new house, the city can wait until it acts on the house.

Did the homeowner in Shi v. Palos Verdes Estates win money?

Not yet. The Court of Appeal only reversed the dismissal, so the case goes back to the trial court. Shi alleges losses of more than $1 million; none have been awarded, and the city can still raise its defenses.

Does the ruling apply to SB 9 or SB 684 projects?

The opinion is about ADUs under section 66317. Commentators expect homeowners to test the same reasoning on other ministerial housing laws, but no court has extended it yet.

Official bill text

• SB 1069 — Land use: zoning. (official bill text, California Legislative Information)

Sources

• Shi v. City of Palos Verdes Estates (Cal. Ct. App., 2d Dist., Div. 4, No. B350195), filed October 23, 2026, certified for publication — Full opinion: facts, Gov. Code 66317 and 815.6 analysis, judgment reversed
• Government Code section 66317 (ministerial ADU approval, 60-day deadline) — Subdivision (a)(1) ministerial approval, (a)(3) 60 days, (c) no other local rule may be the basis for delay
• Government Code section 815.6 (mandatory duty liability) — Liability unless the public entity shows reasonable diligence
• HCD findings on Palos Verdes Estates' ADU ordinance, April 4, 2024 — HCD found Ordinance No. O-760 did not comply with state ADU law
• HousingWire: Ruling: California cities risk a price to pay to delay housing permits (October 28, 2026) — Coverage and commentary on reach to other ministerial housing laws

• ADU permit delay
• Shi v. City of Palos Verdes Estates
• can I sue my city for ADU permit delay
• ADU 60 day approval deadline
• Government Code 66317
• Government Code 815.6
• ministerial ADU approval
• ADU permit deemed approved
• Palos Verdes Estates ADU

Informational only. Not legal, architectural, or investment advice. Confirm current rules with your local planning department.