If one party to a construction contract does work that turns out to be defective, the other party is allowed by law to 'set off' or deduct a sum required to make good that defect. This happens frequently in construction contracts and regularly involves large sums of money, disputes, and litigation. It is a complex area of the law with a number of cases, as well as the contractual provisions themselves, which prescribe a party's right of set-off. This book clearly describes the law and examines the provisions of the main building and civil engineering contracts.