California Court Clarifies Insurance Coverage When Construction and Storm Damage Combine

When several events contribute to one loss, California does not simply ask which event happened first or last. Insurance Code section 530 focuses on proximate cause: an insurer may be liable when an insured peril is the proximate cause even if another peril was remote, but not when the insured peril was only remote.²

Garvey v. State Farm Fire & Casualty Co. (1989) 48 Cal.3d 395, 403–404 explains that the efficient proximate cause is the predominant or most important cause in the applicable causal chain. An excluded event does not automatically eliminate coverage if a covered peril was the efficient proximate cause.³

Linsao therefore is not a rule that multiple causes mean no coverage. Policy language, the supported causes, and which cause predominated still matter.

First American argued that every possible efficient proximate cause supported by the summary-judgment record was excluded: the rainstorm, earth movement or mud, the neighboring construction, and the events surrounding the interruption of retaining-wall construction.

The homeowners argued that uncertainty about which event predominated should require a trial. The Court of Appeal disagreed. A real dispute between a potentially covered efficient cause and an excluded one may require a factfinder. But uncertainty does not create coverage where every legally viable possible efficient cause is excluded.

The court relied on Brodkin v. State Farm Fire & Casualty Co. (1989) 217 Cal.App.3d 210, 217 for the narrower point that summary judgment may be proper when all alleged efficient causes fall within policy exclusions, even if the parties dispute which one predominated.⁴

The homeowners argued that the neighbor's complaint led the City to request that work pause and could therefore be the efficient cause. The court rejected that theory.

A remote event does not become the efficient proximate cause merely because later events might not have occurred without it. The complaint could not independently have caused the physical damage. Treating every link in the history as a separate peril would turn remote but-for events into predominant causes, contrary to California's framework.

The homeowners argued that inadequate construction should require proof of negligent or faulty construction. The court disagreed under this policy's wording. It applied the ordinary meaning of inadequate: insufficient or incapable of performing the intended function.

Wilson v. Farmers Insurance Exchange (2002) 102 Cal.App.4th 1171, 1174 similarly treated materially unfinished construction as potentially within an inadequate-construction exclusion. In Linsao, about 15 feet remained unfinished, with only caisson holes and rebar in place.⁵

The holding is policy- and fact-specific. It does not mean every construction-related loss is excluded, that incomplete construction always defeats coverage, or that inadequate construction always has the same effect under every policy.

No. The appellate case decided whether the homeowners' own property-insurance policy covered the loss. It did not adjudicate whether the neighboring contractor, City, developer, or another participant was negligent or legally responsible.

The homeowners separately sued the City, the contractor, and other parties associated with the neighboring work. Linsao did not decide that separate action. A first-party policy exclusion does not itself resolve a negligence, contract, indemnity, or property-damage claim against someone alleged to have caused the loss.

That distinction is important in construction- and contractor-caused property damage: insurance coverage asks what the owner's policy promises, while third-party liability asks whether another person or entity is legally responsible for causing the damage.

The homeowners relied on evidence that insurance personnel allegedly said the loss would be covered. The court recognized that factual questions could exist about what was said and whether the homeowners relied on it.

But it applied the general rule that estoppel ordinarily cannot create policy coverage for a risk the contract did not cover. The court distinguished decisions involving liability insurers that assumed the defense of third-party lawsuits and caused insureds to surrender other means of protecting themselves.

The holding should not be reduced to ‘an insurer can always change its mind without consequence.’ It addresses the particular estoppel and coverage theories presented on this record.

Preserve photographs and video from before and after the loss; construction, grading, drainage, and retaining-wall plans; permits; contractor communications; weather records; engineering and geotechnical reports; inspection records; repair estimates; insurance correspondence; expert evaluations; and loss-of-use documentation.

For potential third-party claims, contracts, subcontractor roles, site-control evidence, and records showing who directed the relevant work may also matter. Early preservation can help separate what the policy covers from who may have caused the physical loss.

Construction-related storm damage can create two potential recovery paths. First: what does the property owner's own policy cover? Second: did another party cause the damage and face separate liability? Those questions should be evaluated independently.

Linsao resolved the first question on the record and policy before the court. It did not eliminate every possible avenue of third-party recovery. Property owners and businesses may need to analyze both the coverage language and the evidence supporting business and commercial litigation against an allegedly responsible participant.

A related Mahrouyan Law Insight, California Court Clarifies Shipper Liability After Overheight Cargo Strikes Bridge, explains another setting in which one participant's duties did not automatically eliminate a third party's potential responsibility.