The answer provided by chatbot is deemed as accurate. For a contract to be valid and binding,the following elements must be established and satisfied; offer, acceptance, consideration,intention to create legal relations. In this scenario, whilst it may potentially be established thatoffer, acceptance, consideration and intention to create legal relations can be satisfied, it isunlikely that the elements of certainty can be made out. This scenario involves a contractbetween Paul Stratford (the builder) and John and Angela Porter for building an extension totheir house. The main issue is that Paul did not install any doors, and he argues that doors werenot mentioned in the quote, in other words he is not obligated to install them. The answer startsby discussing the concept of implied terms in contract law referring to the facts from Greaves &Co. (Contractors Ltd v. Baynham Meikle & Partners [1975] 1. W.L.R 1095). In regards to impliedterms, since doors are an underlying component of a building, John and Angela might arguethat it is a necessary for the extension to serve its purpose as a habitable place. Given that theimplied terms are reasonable and equable for both parties it would be expected they areincluded in the construction of the building. While the original quote didnt explicitly mentiondoors since John and Angela accepted the quote and asked about when the they cancommence it can be seen as an indication that they are expected to complete the entirety of theextension,includingthedoors.Basedontheseprinciplesboth John and Angela couldpotentially have a valid argument