Few building contracts of any size reach completion these days without a range of claims being made. These can involve considerable sums of money and can entail lengthy - and costly - arbitration and litigation. This book by two well-known experts examines the legal and practical aspects of claims under JCT 80, JCT 63, subcontract forms and GC/Works/1. It gives clear guidance on what are valid and invalid claims. This established text has been updated to include the latest case law, information on the JCT intermediate form.