Delivery risk on commercial contracts is generally well managed by the project team. We therefore urge homeowners to emulate this success by appointing a competent Architect, Contractor, and Project Manager. They have a legal duty of care and legislated level of competence to manage the interface of the trades for the design, fabrication, and installation of doors, windows, and related fenestration. The fabrication drawing approval process forms a key part of this process, as the interface details create a high risk of failure in function and form.