Privity

Privity is the legal doctrine that only parties directly named in a contract can enforce its terms or be bound by its obligations. If two companies sign a supply agreement, only those two companies have legal standing to sue under it. A third-party supplier affected by the terms, or a customer who benefits from the contract, has no right to enforce it unless they are explicitly named.

The doctrine traces to 19th-century English common law and exists to protect people from being bound by, or held responsible under, agreements they did not participate in forming.

The Core Problem Privity Solves

Contract law depends on mutual consent. Both parties must agree to the terms before a contract is enforceable. Extending enforcement rights to people who were never at the table would undermine that principle. If strangers to a contract could sue on it, businesses would face unpredictable claims from third parties for every contract they signed.

The 1861 English case of Tweddle v. Atkinson established the rule clearly. A father and a father-in-law agreed to pay money to the newlywed husband of one's daughter. When the father-in-law died without paying, the husband tried to sue. The court ruled against him because he was not a party to the agreement, even though the contract was expressly made for his benefit.

Exceptions That Have Eroded Strict Privity

Courts and legislatures have carved out numerous exceptions over time, recognizing situations where strict privity would produce unfair or commercially impractical results.

• Third-party beneficiaries: If a contract is expressly made for the benefit of a third party, most U.S. jurisdictions allow that party to enforce it. A father who contracts with a college to provide education for his son creates rights in the son as an intended beneficiary.
• Assignment: A party can transfer its contractual rights to a third party. The assignee steps into the original party's position and can enforce the rights assigned to them.
• Agency: When someone acts as an agent, the principal behind them can sue or be sued on the contract even though only the agent signed it.
• Insurance: A person injured by someone else's negligence can typically claim directly against the at-fault party's liability insurer, even though they have no contract with the insurer.
• Product liability: Courts eliminated the privity requirement in negligence cases involving defective products. The landmark 1916 U.S. case of MacPherson v. Buick Motor Co. held a manufacturer liable to a consumer who was not in privity with the manufacturer, but whose wheel collapsed from a defect.

Statutory Reform in the United Kingdom

The United Kingdom passed the Contracts (Rights of Third Parties) Act 1999 to formally address the rigidity of the privity rule. The Act allows a third party to enforce a contract term if the contract expressly states they may, or if the contract purports to confer a benefit on them and there is no indication the parties intended to exclude the right to enforce.

Many other Commonwealth jurisdictions have adopted similar legislation. U.S. law developed the third-party beneficiary doctrine through case law rather than statute, reaching similar outcomes through a different path.

Privity in Modern Commercial Practice

Today privity functions as the default position: absent exceptions, only contracting parties can sue. Practitioners account for this in contract drafting. Contracts frequently include "no third-party beneficiary" clauses explicitly denying enforcement rights to anyone not named in the agreement. This protects parties from unintended claims by downstream recipients, subcontractors, or customers who argue the contract was made for their benefit.

Sources

• https://fynk.com/en/glossary/privity-of-contract/
• https://www.stimmel-law.com/index.php/en/articles/privity-contract-and-third-party-beneficiaries
• https://www.upcounsel.com/privity-of-contract-exceptions