warranty is a guarantee on the good that comes as part of the sales contract, but contract law treats warranties as an additional form of contract that binds the selling party to undertake a certain action. Typically, the selling party has an obligation to provide a product that achieves a specified task, or to deliver a service that meets certain minimal standards. Warranties are offered for a range of different goods and services, from manufactured goods to real estate to plumbing services. The warranty assures the buyer that the good or service is free from defects, and it is a legally binding commitment. In the event that the product or service fails to meet the standards set out in the warranty, then the contract provides a specific remedy, such as a replacement or repair.

Express and implied warranties

Warranties can be express, implied, or both. Both express and implied warranties provide legal relief for the purchaser in the event of a breach of contract.

An express warranty is one in which the seller explicitly guarantees the quality of the good or service sold. Typically, the vendor provides a statement, or other binding document, as part of the sales contract. What this means in practice is that the buyer has engaged in the contract on the reasonable assumption that the quality, nature, character, purpose, performance, state, use, or capacity of the goods or services are the same as those stated by the seller. Therefore, the sales contract is based, in part, on the understanding that the goods or services being supplied by the seller will conform to the description, or any sample, that has been provided.

There is not a specific way that words must be formed to make an express warranty valid. Importantly, the sales contract does not need to explicitly state that a warranty is being intended. It is enough that the seller asserts facts about the goods that then become part of the contract between the parties. However, the courts do apply a reasonableness test of reliance upon warranties. Puffery, or language used to bolster sales, is lawful, and the consumer is required to apply reason when evaluating such statements. For example, buyers are expected to use reason when judging seller claims such as “this sandwich is the best in the world.” Obvious sales talk cannot ordinarily be treated as a legally binding warranty.

breach of the warranty occurs when the express warranty has been found to be false. In such circumstances, the warrantor is legally liable just as though the truth of the warranty had been guaranteed. The courts do not accept as a defense:

  • Seller claims the warranty was true.
  • Seller claims due care was exercised in the production or handling of the product.
  • Seller claims there is not any reason to believe that the warranty was false.

In certain circumstances where no express warranty was made, the law implies a warranty. This statement means that the warranty automatically arises from the fact that a sale was made. With regard to implied warranties, the law distinguishes between casual sellers and merchant sellers, with the latter held to a higher standard, given that they are in the business of buying or selling the good or service rendered. For example, unless otherwise agreed, goods sold by merchants carry an implied warranty against claims by any third party by way of trademark infringement, patent infringement, or any other intellectual property law infringement. This type of warranty is known as the warranty against infringement. Another implied warranty provided by merchant sellers is the warranty of fitness for normal use, which means that the goods must be fit for the ordinary purposes for which they are sold.

It is important to note that if express warranties are made, this does not preclude implied warranties. If an express warranty is made, it should be consistent with implied warranties, and can be treated as cumulative, if such a construction is reasonable. If the express and implied warranties cannot be construed as consistent and cumulative, the express warranty generally prevails over the implied warranty, except in the case of the implied warranty of merchantability, or fitness for purpose.

Breaches of warranty

If the buyer believes that there has been a breach of the implied warranty of merchantability, it is their responsibility to demonstrate that the good was defective, that this defect made the good not fit for purpose, and that this defect caused the plaintiff harm. Typical examples of defects are:

  • Design defects.
  • Manufacturing defects.
  • Inadequate instructions on the use of the good.
  • Inadequate warning against the dangers involved in using the good.

The buyer might intend to use the goods purchased for a different purpose than that for which it was sold. In this case, the implied warranty holds only if the buyer relies on the seller’s skill or judgment to select the product, the buyer informs the seller at the time of purchase of his or her intention for the use of the good, and the buyer relies on the seller’s judgment and skill in making the final choice. If the seller is not made aware of the buyer’s true intention, or does not offer his or her skill and judgment in aiding the sale, then warranty of fitness for a particular purpose does not arise. For this reason, it is common for vendors to include provisions in the average terms and conditions of sale with regard to the true and intended purpose of use.


  1. Business Law I Essentials. OpenStax. https://openstax.org/books/business-law-i-essentials/pages/1-introduction