Negligent Undertaking in California Premises Cases

An analysis for plaintiff’s counsel

The negligent undertaking doctrine — sometimes still called the “Good Samaritan” theory — is one of the most powerful and underused theories in California premises litigation. It pierces the conventional duty analysis by holding that a defendant who voluntarily undertakes a service to another assumes a duty to perform it with reasonable care.

After the $60 million Orange County verdict in O’Malley v. Diamond Resorts (January 2022) and the Fourth District Court of Appeal’s unanimous affirmance in November 2023 (G061459), plaintiff’s counsel handling delayed-care, welfare-check, security-call, and similar premises cases have an appellate authority that hits all the right notes. After CCP § 998 enhancements and post-judgment interest, the final paid recovery exceeded $100 million.

This page is a working brief on how to plead, develop, and try a negligent undertaking theory in California after O’Malley.

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The doctrinal foundation

California adopted the negligent undertaking doctrine in Artiglio v. Corning Inc., 18 Cal. 4th 604 (1998), drawing on Restatement (Second) of Torts § 324A. The doctrine has three operative elements, plus a causation requirement:

1. The defendant undertook to render services to another (gratuitously or for consideration)
2. The defendant should have recognized those services as necessary for the protection of a third person (or, in the direct-victim variant, the plaintiff)
3. The defendant failed to exercise reasonable care in performing the undertaking
4. The defendant’s failure caused harm because:
   • 1. it increased the risk of harm, or
   • 2. the defendant undertook to perform a duty owed by another, or
   • 3. the harm resulted from reliance on the undertaking

The plaintiff need only prove one of (a), (b), or (c). In hotel welfare-check cases, (a) and (c) often coexist and overlap.

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Why this matters in hotel welfare-check cases

The traditional defense in a hotel welfare-check case runs like this:

We had no duty to check on the plaintiff at all. The plaintiff’s family asked us to do something we were not legally required to do. Even if we did it poorly, we owed no actionable duty, and the plaintiff’s injury was caused by the underlying medical event, not by us.

Negligent undertaking dismantles this defense in three moves:

Move one — duty: The hotel’s argument that “we had no duty” is irrelevant. Under § 324A, once the hotel agreed to perform the check, it assumed the duty, regardless of whether it had a baseline obligation. Duty is created by the agreement and the performance, not by the underlying relationship.

Move two — breach: The hotel’s own written policy becomes the benchmark for reasonable care. If the policy required two trained staff members, sending one untrained worker is breach as a matter of fact, and frequently as a matter of law on the standard of care.

Move three — causation: The plaintiff does not have to prove the hotel caused the medical event. The plaintiff has to prove that the hotel’s negligent performance of the welfare check increased the risk of harm or was relied upon to the plaintiff’s family’s detriment. Both are readily provable in the typical fact pattern.

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How O’Malley makes the doctrine usable — from MSJ through appeal

Before O’Malley, plaintiff’s counsel often saw negligent undertaking claims dismissed or weakened at multiple procedural stages on the grounds that:

• The undertaking was not “formal” enough to create duty
• The plaintiff could not show actual reliance
• The increased-risk theory was speculative without a medical causation expert testifying to the precise counterfactual
• A family member’s phone call somehow shifted the duty to the family member

The Fourth District Court of Appeal’s affirmance in O’Malley addresses each of these. The opinion treats a phone call from a family member to the front desk as a sufficient undertaking by the hotel. It treats sending a single untrained employee to perform a task the written policy required two trained employees to perform as sufficient breach. And it treats the medical evidence of delayed-care harm as sufficient on causation.

Most importantly, the Court of Appeal squarely rejected Diamond’s central appellate gambit — that Michael O’Malley undertook the duty by calling the hotel. Writing for a unanimous panel, Justice Eileen C. Moore held:

“We find Michael did not undertake to render services to Priscilla simply by calling the hotel. More importantly, we find it is not reasonably probable that had the jury been instructed on comparative negligence, the jurors would have then found Michael partially at fault for his wife’s brain injuries.” — O’Malley et al. v. Diamond Resorts Management Inc., G061459 (4th App. Dist.)

The practical effect: plaintiffs now have appellate authority for the proposition that (a) factual disputes about the adequacy of a voluntary undertaking belong to a jury, and (b) the defense cannot off-load its duty onto the family member who made the call.

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Pleading the theory

Plead negligent undertaking as a separate cause of action alongside (not in place of) general negligence and premises liability. Doing so:

• Forces the defense to address the theory specifically in motion practice
• Preserves the issue cleanly for appeal
• Anchors the case at the standard the defendant’s own policies set

Suggested elements paragraph:

Defendant voluntarily undertook to render the services of conducting a welfare check on plaintiff at the request of plaintiff’s [spouse/family member]. Defendant knew or should have known that those services were necessary for the protection of plaintiff. Defendant failed to exercise reasonable care in conducting that welfare check, including but not limited to sending [a single untrained staff member / an inadequately supervised employee / staff without functioning communication equipment / staff without training in medical emergency recognition]. Defendant’s negligent performance of the welfare check (a) increased the risk that plaintiff would suffer the harm she ultimately suffered, and (b) was relied upon by plaintiff’s [spouse/family member], who would otherwise have taken alternative steps to render or summon aid.

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Developing the record in discovery

Discovery should be designed to lock down four points before depositions of the corporate defendants:

1. The policy. Every version of the welfare-check policy in effect during and around the incident. Drafts, revisions, training materials, posters, internal memoranda. Establish what the hotel said the standard of care was — by its own admission.

2. The training. Who at the property was trained on the policy, when, by whom, and to what depth. Sign-in sheets, training rosters, quiz results. If the responder at the time of the incident was not on the training roster, that fact wins the case.

3. The deviation. Documentation showing what actually happened on the night of the incident — call logs, dispatch records, key card logs, video, written reports. Compare it line by line against what the policy required.

4. The history. Prior welfare-check incidents at this property and at sister properties under the same corporate ownership. Internal incident reports, prior litigation, prior insurance claims. A pattern of similar deviations supports a Civil Code § 3294 punitive damages theory in the right case.

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Anticipating the defense’s framing

Expect the defense to argue:

“There was no undertaking — just a phone call.” Counter with the policy itself, which contemplates exactly this scenario and prescribes a response. The hotel cannot promulgate a policy on welfare checks and then deny that performing one is an undertaking.

“The medical event was the sole cause.” Counter with treating-physician testimony on the importance of timely intervention in the underlying condition, and with the increased-risk-of-harm theory under § 324A(a).

“There was no reliance because the family member would have driven to the hotel anyway.” Counter with the family member’s contemporaneous statements (texts, phone records) reflecting that they delayed their own response based on the hotel’s report. In O’Malley, the husband’s actions immediately after the negligent welfare check — including the fact that he ultimately drove to the hotel himself — were used as direct evidence of reliance combined with eventual self-help.

“The family member who called the hotel undertook the duty themselves.” This is the argument Diamond pressed at trial and lost on appeal. Justice Moore’s opinion forecloses it: a spouse or family member who calls a hotel to ask for a welfare check has not undertaken anything. The hotel has. Cite G061459.

“The policy was aspirational, not mandatory.” Counter with deposition testimony from corporate designees admitting the policy was mandatory, and with the training records showing it was taught as such.

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Damages framing under the theory

Negligent undertaking damages are calculated the same as general negligence damages — the plaintiff is compensated for the increased harm caused by the negligent performance. Critically, the plaintiff does not bear the entire underlying medical event; the defendant bears the incremental injury attributable to the negligent undertaking. In practice, the incremental injury in delayed-care cases is often the dominant injury (e.g., the difference between a survivable aneurysm and one resulting in permanent disability).

This framing helps with jury instruction and closing argument: the case is about what the defendant added to the situation, not what the situation was at the start.

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Refer or co-counsel a difficult case

The Homampour Law Firm tries catastrophic negligent undertaking cases throughout California and accepts referrals and co-counsel arrangements on appropriate cases. We have the trial experience, the appellate experience (including the underlying O’Malley appeal handled with Jeffrey I. Ehrlich of The Ehrlich Law Firm), and the resources to take these cases through verdict and a complete appellate cycle. O’Malley itself: $60 million verdict, $100 million+ final paid judgment, unanimous appellate affirmance. Contact our office to discuss referral terms.

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Related pages

• The $60M O’Malley case study
• Defeating summary judgment in delayed-care cases
• Medical causation in increased-harm cases
• Joint employer liability against hotel staffing contractors

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Frequently Asked Questions

What is the negligent undertaking doctrine in California?

Negligent undertaking holds that a defendant who voluntarily agrees to render services to another assumes a duty to perform those services with reasonable care. California adopted the doctrine from Restatement (Second) of Torts § 324A in Artiglio v. Corning Inc., 18 Cal. 4th 604 (1998). It applies even when no preexisting duty existed.

How is duty established under § 324A?

Three elements plus a causation requirement: (1) the defendant undertook to render services, (2) the defendant should have recognized those services as necessary for protection, (3) the defendant failed to exercise reasonable care in the undertaking, and (4) the failure caused harm by (a) increasing the risk of harm, (b) undertaking a duty owed by another, or (c) inducing reliance. The plaintiff need only prove one of (a), (b), or (c).

How does O’Malley v. Diamond Resorts strengthen the negligent undertaking theory in California?

The Fourth District Court of Appeal (G061459, Nov. 2023) unanimously affirmed a $100M+ judgment built on a negligent undertaking theory. Critically, the court rejected the defense’s argument that a family member who calls a hotel to request a welfare check has themselves “undertaken” the duty. Justice Eileen C. Moore wrote that Michael O’Malley did not undertake to render services by calling the hotel — a holding that forecloses a frequently-raised defense gambit.

What is the difference between negligent undertaking and ordinary negligence?

Ordinary negligence depends on a preexisting duty arising from a relationship or status. Negligent undertaking creates duty by the defendant’s own voluntary act — even if no underlying duty existed. This makes it a powerful theory for plaintiff’s counsel when traditional duty analysis is murky.

Should I plead negligent undertaking alongside general negligence?

Yes. Plead it as a separate cause of action, not as a substitute. Doing so forces the defense to address the theory in motion practice, preserves the issue for appeal, and anchors the case at the standard set by the defendant’s own policies and conduct.