Breach of warranty describes a failure to comply with a contractual warranty - a contractual promise that something is, or will be, as stated - without necessarily going to the root of the contract. In commercial and consumer law across England and Wales, Scotland, Northern Ireland and Ireland, a breach of warranty typically gives rise to a right to claim damages, but not (absent contrary agreement) to terminate the contract or reject the goods or services.The concept is recognised and developed through case law and legislation, notably the Sale of Goods Act 1979, the Supply of Goods and Services Act 1982, the Consumer Rights Act 2015 (England and Wales, Scotland, Northern Ireland) and the Sale of Goods and Supply of Services Act 1980 (Ireland), which distinguish between “conditions” and “warranties”.In practice, breach of warranty is central to contract drafting, risk allocation, limitation and exclusion clauses, and insurance claims (including warranty and indemnity insurance). Parties often litigate over whether a term is a condition, warranty or intermediate term, as this classification determines available remedies and commercial leverage. Usage and legal effect are broadly consistent across the UK and Ireland, subject to local statutory frameworks and consumer protection rules.