Advocates third-party rights as envisaged by the Contracts (Rights of Third Parties) Act 1999 as a more efficient and cheaper alternative to collateral warranties. The market appears to be warming to third-party rights and the imminent JCT contracts will be adopting an approach that give rights to funders, purchasers and tenants. Describes law practice Addleshaw Goddard's client documentation known as three in one that relies on the Act for the protection of all parties. Explains what Three in One means for its beneficiaries and goes through the mechanics of the documentation. Discusses the special considerations applying to the use of three in one in replacing subcontractors' appointments, the contracting parties' entitlement to vary or rescind the principal contract upon conferral of third-part rights and whether PII policies will cover claims pursuant to third-party rights. Appended is a positive assessment of third-party rights.