This research investigates a range of legal issues with relationship contracts for the delivery of major construction and infrastructure projects. Historically, such projects have been delivered using a traditional form of construction contract. Relationship contracts attempt to foster a more productive working environment by shifting from a rights based culture to one based on collaboration. This research investigates a number of potential legal issues with this approach, including: the use of agreements to negotiate; collateral contracts; estoppel; fiduciary duties; good faith; and whether the dispute resolution mechanisms attempt to oust the jurisdiction of the courts.