This Q&A considers whether a contractor on a residential construction project may sue its sub-contractor under the Defective Premises Act 1972 (DPA 1972), section 1. Overview of DPA 1972, s 1 DPA 1972 provides homeowners, leaseholders, and others affected by defects in residential properties, with rights of action against the parties responsible for the defects. In terms of DPA 1972, s 1(1), a person who, in the course of a business, takes on work for, or in connection with, the provision of a dwelling owes a duty to ensure that the work is done in a workmanlike or professional manner, with proper materials, so that on completion of the work, the dwelling is fit for habitation (the ‘section 1 duty’). The section 1 duty is owed to: • any person who acquires a legal or equitable interest in the dwelling (s 1(1)(b)), and • ‘if the dwelling was provided to the order of any person, that person’ (s 1(1)(a)) If a contractor was owed