Definition
An express warranty is a promise, affirmation, description, or representation made by a seller, manufacturer, or insurer that becomes part of the basis of a bargain and creates an enforceable obligation regarding the quality, condition, or performance of goods, property, or a risk.
The term operates in two principal legal contexts:
1. Sales and commercial law. Under modern sales law (UCC §2-313), a seller creates an express warranty by (a) making an affirmation of fact or promise about the goods, (b) providing a description of the goods that is made part of the basis of the bargain, or (c) furnishing a sample or model from which conformity is expected. No particular words are required, and the seller need not use the word "warranty" or "guarantee." The warranty is express because it originates in something the seller actually said, wrote, demonstrated, or described — as opposed to a warranty implied by law from the nature of the transaction.
2. Insurance law. An express warranty in an insurance policy is a stipulation made by the insured, incorporated into the policy itself, that certain facts relating to the risk are true or that certain acts will be performed. Historically, breach of an express insurance warranty voided coverage regardless of materiality — a rule that most modern statutes and courts have significantly softened.
3. Historical conveyancing use. In older real property law, an express warranty was a covenant in a deed, typically signaled by the word warrantizo (I warrant), by which the grantor promised to defend the grantee's title. This use is largely obsolete in modern practice, replaced by statutory warranty deeds and title covenants, but it appears throughout historical sources.
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Common Language
Modern common usage (Wiktionary): A written guarantee provided with a product, typically describing what the manufacturer will repair or replace if the product fails within a stated period.
Historical common usage (Webster's 1913): Not separately defined; "warranty" is treated as a legal term of art.
The common understanding of "warranty" — a printed document in the box promising repair or replacement — captures only a narrow slice of the legal concept. An express warranty in law can be created by an oral statement, an advertisement, a product label, or a catalog description. It does not require a formal document, a specified duration, or any particular formality. Researchers working with consumer disputes, advertising claims, or products liability cases should resist the assumption that "express warranty" means only a written manufacturer's guarantee.
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Common Confusion
Express warranty vs. implied warranty. An express warranty arises from what the seller actually said or did. An implied warranty arises by operation of law regardless of what was said — most importantly, the implied warranty of merchantability (UCC §2-314) and the implied warranty of fitness for a particular purpose (UCC §2-315). The two can coexist in the same transaction. Sellers frequently attempt to disclaim implied warranties while preserving express ones; under the UCC, a disclaimer that conflicts with an express warranty is generally ineffective to the extent of the conflict.
Express warranty vs. mere puffery. Not every seller's statement creates a warranty. Statements of opinion, commendations of value, and vague promotional language ("best product on the market") are typically treated as puffery and do not give rise to an express warranty. The line between a warranted affirmation of fact and non-actionable puffery is frequently litigated.
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Core Elements
Under UCC §2-313, an express warranty in a sales transaction requires:
1. An affirmation of fact or promise, a description of goods, or a sample or model — the triggering representation.
2. That the representation relate to the goods — statements about collateral matters do not qualify.
3. That the representation become part of the basis of the bargain — the buyer must have been exposed to and reasonably relied upon the representation as part of the transaction, though the UCC shifted the burden of this showing compared to common law.
In insurance, the elements are:
1. A statement incorporated into the policy (not merely in a separate document).
2. That the statement constitute a stipulation, not merely a representation.
3. Breach of that stipulation — at common law, regardless of materiality to the loss.
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Why It Matters in Research
The term spans three doctrinal areas — sales law, insurance law, and historical property law — and researchers must anchor their search to the correct context before reading any source. A nineteenth-century treatise discussing express warranty in insurance law will describe rules (strict, literal compliance required; any breach voids coverage) that no longer reflect mainstream U.S. law in most jurisdictions. Similarly, Burrill's conveyancing definition is historically informative but entirely inapplicable to a UCC sales dispute.
The UCC transformation is the critical modern development. Before the UCC's widespread adoption, express warranty doctrine was grounded in contract privity, required specific words or formalities in many jurisdictions, and was much harder to establish through informal representations or advertising. Post-UCC sources and pre-UCC sources are genuinely different bodies of law; mixing them without attention to date and jurisdiction will produce error.
In products liability research, express warranty is a distinct theory of recovery alongside negligence and strict liability. It matters because it carries a different statute of limitations (often contract-based rather than tort), different privity rules (increasingly relaxed), and different damage measures. Researchers using torts_80 should read it alongside contracts_115 to capture both dimensions.
For insurance research, watch for the historical strictness rule in older sources and then track the statutory modifications in the relevant jurisdiction. Many states have enacted provisions requiring that a breach of warranty be material to the loss before it can defeat coverage — a significant departure from the common law rule reflected in Black's, Bouvier's, and Burrill's.
The "basis of the bargain" standard under UCC §2-313 replaced the traditional "reliance" requirement, though courts have interpreted this shift inconsistently. Corpus materials from the 1960s through the 1990s will show active judicial debate over what "basis of the bargain" requires, and researchers should not assume uniformity.
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Historical Dictionary Support
The historical dictionaries present express warranty primarily through two lenses: conveyancing and insurance. Burrill's is the most thorough, distinguishing express warranty in deeds (warranty by specific words such as warrantizo, as opposed to warranties implied from words like dedi) from express warranty in insurance policies. Black's and Bouvier's emphasize the insurance definition, both drawing on Phillips on Insurance. Rapalje & Lawrence is the most economical, essentially cross-referencing warranty and insurance rather than elaborating independently.
All four sources treat the insurance warranty rule as strict: the assured stipulates that facts are or shall be true, and the implication in the older authorities is that the stipulation is binding without qualification. This reflects the historical rule rather than modern law. None of the historical sources addresses sales warranty in any developed way — the commercial warranty doctrine that dominates modern practice emerged primarily through the UCC and its precursors (the Uniform Sales Act), which postdate or barely overlap with these dictionaries.
The Latin maxim quoted by Black's and Rapalje & Lawrence — Expressa nocent, non expressa non nocent (things expressed may be prejudicial; things not expressed are not) — captures an important doctrinal logic: by making an express warranty, a party takes on risk they could have avoided by remaining silent. This cuts both ways: it explains why express warranties carry strict liability consequences, and why courts scrutinize whether a representation was genuinely incorporated into the bargain.
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Jurisdictional Note
Express warranty in sales transactions is governed by UCC Article 2 in all U.S. states (with Louisiana as a partial exception). Insurance express warranty rules vary significantly by state statute; many states now require materiality as a condition of forfeiture, but the specifics differ. For international commercial sales, the CISG provides its own framework for seller representations that partially parallels UCC §2-313 but is not identical.
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Encyclopedia Cross-Reference
contracts_115: UCC Article 2 — Warranties — Express Warranties (§2-313), The Law Mind Contracts & Commercial Law Encyclopedia — primary reference for modern sales law doctrine and UCC framework.
torts_80: Products Liability — Breach of Warranty (Express and Implied), The Law Mind Torts & Personal Injury Encyclopedia — essential for understanding express warranty as a products liability theory.
contracts_116: UCC Article 2 — Warranties — Implied Warranty of Merchantability (§2-314), The Law Mind Contracts & Commercial Law Encyclopedia — read alongside contracts_115 to understand the boundary between express and implied warranties.
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