Paul Stratford (builder) gave a quote to build an extension to the front of John and Angela Porter's house at Penrith for $92,530. Seven days later John and Angela accepted the quote by sending a text saying, "Thanks for your quote which is accepted. Can you please let me know when the work can start". Seven days later Paul started the work. Just prior to completion John and Angela noted that no doors were installed to any room, including the front door to the extension. When John and Angela questioned Paul he said," Doors were not mentioned in the quote and therefore I don't have to install them".