Master New York's high court holds that evidence of industry custom is admissible and can establish negligence and constructive notice in a landlord-tenant injury case involving ordinary shower glass. with this comprehensive case brief.
Trimarco v. Klein is a leading New York Court of Appeals decision on the role of custom and usage in defining reasonable care in negligence actions. The case arose from a tenant's severe injuries after ordinary plate glass in a bathtub enclosure shattered. At its core, the case asks whether a landlord's failure to follow a widespread industry practice to use safety glazing materials can furnish the standard of care and support a finding of negligence, even where no statute made retrofitting mandatory.
The decision is frequently paired with cases like The T.J. Hooper to teach that custom is powerful but not dispositive evidence: it can inform the jury about what prudent actors do in similar circumstances, and deviation from a well-defined and general practice may evidence negligence. Yet custom neither conclusively sets the legal standard nor immunizes actors who comply with it. For students, Trimarco provides a clear framework on how to use and attack custom evidence, and how such proof can also bear on notice in premises liability.
Trimarco v. Klein, 56 N.Y.2d 98, 436 N.E.2d 502, 451 N.Y.S.2d 52 (N.Y. 1982)
Plaintiff Trimarco, a tenant in defendant Klein's New York City apartment building, was injured when a sliding glass bathtub enclosure shattered as he was stepping from the tub. The panel contained ordinary, non-safety plate glass that fragmented into sharp shards, causing serious lacerations. At trial, Trimarco introduced testimony and documentary proof that, beginning in the 1950s, building owners, contractors, and suppliers widely adopted a practice of using shatterproof or safety glazing (such as tempered or laminated glass, wired glass, or plastic) for bathtub and shower enclosures, especially when replacing older glass. He also offered evidence of later-enacted statutes and codes requiring safety glazing in hazardous locations like tub enclosures for new installations and replacements, not as retroactive mandates but as corroboration of an existing, well-established custom recognizing the hazard of ordinary glass. The landlord did not show that the glass had ever been replaced with safety materials, and there was no claim that any statutory requirement compelled retrofitting of the decades-old panel. A jury returned a verdict for Trimarco. The Appellate Division reversed and dismissed the complaint, concluding, in substance, that the proof was insufficient on negligence and notice. Trimarco appealed to the Court of Appeals.
Whether proof of a well-defined and widely accepted custom to use safety glazing in bathtub enclosures, together with evidence that the landlord failed to follow that custom, is admissible and sufficient to support a finding that the landlord breached the duty of reasonable care and had constructive notice of the hazard posed by ordinary plate glass.
In negligence actions, evidence of industry custom and usage is admissible as probative of reasonable care. When a customary practice is well established and general in the relevant community, a jury may infer negligence from a defendant's deviation from that practice, provided the jury also finds the custom itself to be reasonable under the circumstances. Compliance with custom does not automatically establish due care, and noncompliance is not conclusive of negligence. In premises liability, a landlord may be liable for a dangerous condition on the premises if the landlord created it or had actual or constructive notice of it; widespread custom, and the recognition it reflects of a known hazard and feasible safety measures, can support constructive notice. Statutes or codes adopted after an installation are not retroactive mandates but may be considered as some evidence bearing on the existence and reasonableness of the practice and the recognition of the hazard.
The Court of Appeals reversed the Appellate Division and held that the plaintiff's evidence of a long-standing, general custom to use safety glazing in bathtub enclosures, and the landlord's failure to adhere to that practice, was properly admitted and sufficient to create a jury question on negligence and constructive notice. The dismissal of the complaint was error.
The court explained that custom and usage can illuminate what prudent actors ordinarily do in similar circumstances and thus inform the standard of reasonable care. Where a practice is widespread, well defined, and geared toward eliminating a known danger, a factfinder may treat the practice as evidence of the conduct of reasonably prudent persons. Here, plaintiff presented substantial evidence that, since at least the 1950s, the building industry recognized the danger of ordinary plate glass in bathtub enclosures and customarily used safety glazing when installing or replacing such glass. The landlord offered no persuasive evidence that the glass had been replaced with safety materials or that the custom was not general or reasonable. Although later-enacted glazing statutes and codes could not retroactively impose a duty to replace existing glass, the court permitted them as corroborative of the existence and reasonableness of the custom and the widespread recognition of the hazard; the court emphasized they were not to be treated as creating negligence per se. On the notice element, the court observed that when a hazard has been widely recognized and commonly addressed through a prevailing safety practice, a jury may infer constructive notice: a reasonably prudent landlord is expected to keep abreast of customary safety measures in the field and to implement them when feasible. Because the evidence supported findings that an accepted safety practice existed, that the landlord deviated from it, and that the deviation concerned a known hazard, the case properly belonged with the jury. The intermediate court's dismissal therefore could not stand.
Trimarco clarifies that custom and usage are potent, but not definitive, tools in negligence litigation. It teaches students how to marshal custom evidence to define reasonable care, to argue constructive notice in premises cases, and to situate later-enacted statutes as corroborative rather than retroactive mandates. The case also balances deference to industry practice with the central torts principle that the jury ultimately decides what reasonable care requires.
Not automatically. Custom is admissible and can be powerful evidence, but the jury must first find that the custom is sufficiently general and reasonable under the circumstances. Deviation from a well-defined and reasonable practice can support a finding of negligence, but it is not conclusive.
No. Compliance with custom is evidence of due care but does not foreclose negligence. The jury may still find that reasonable care required more than customary practice under the particular risks, costs, and feasibilities presented.
Custom can support constructive notice. If a hazard is widely recognized and a safety practice addressing that hazard is general in the industry, a landlord may be charged with knowledge of both the danger and the reasonable precautions, even absent proof of actual notice or prior accidents in the specific unit.
They cannot be applied retroactively to impose a duty, nor do they create negligence per se for older conditions. However, they may be admitted as some evidence corroborating the existence and reasonableness of a preexisting custom and the general recognition of a hazard and feasible remedies.
The plaintiff must show that the practice was well established and general in the relevant community at the relevant time, that it was reasonable, and that the defendant deviated from it in a way that caused the injury. The plaintiff must also satisfy the elements of duty, breach, causation, and damages, including actual or constructive notice where applicable.
Both cases address custom's role in negligence. The T.J. Hooper emphasizes that custom does not set the floor for reasonable care; courts may find negligence even when an entire industry lags behind reasonable safety. Trimarco complements that lesson by explaining that a well-defined custom can be persuasive evidence of what reasonable care requires, allowing juries to infer negligence from deviation.
Trimarco v. Klein stands as a staple of torts pedagogy because it distills the nuanced role of custom in negligence law. It authorizes litigants to use prevailing practices as a lens on reasonable care while preserving the jury's central function to decide whether the practice is reasonable and whether deviation is blameworthy.
For practitioners and students, the case offers a framework to present or attack custom evidence, to argue constructive notice in premises cases, and to navigate statutes that postdate an installation. Trimarco ultimately reinforces that safety practices recognized across an industry carry substantial weight in determining what ordinary prudence demands.
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