Assemble land and site documents, the production boundary, material supply arrangements, layout, utilities, staffing and buyer evidence. Make quotations comparable by recording taxes, transport, installation, exclusions, warranty and validity. Match every major cost to a defined component and every production assumption to its source or clearly labelled estimate.
The NHB mushroom DPR model is a useful historical example of the breadth of a project file. It is not evidence of current eligibility or a substitute for the form required by today's authority or lender. Use the current required format and preserve the supporting evidence so that a reviewer can follow the figures back to their origin.