Verbal agreements are based on the good faith of all parties and can be difficult to prove. Suppose your contractor and his team have suddenly stopped working and they are demanding excessive wages for materials and labor that were not originally agreed. Or your client, the owner, refuses to pay you once the project is complete. In any case, you must ensure that you have a written agreement to protect your rights. If you don`t have an agreement, you risk wasting time and money, not to mention the quality of the construction. The design process also includes many moving parts, and the clear definition of which party is responsible for which role makes the process run more smoothly. A pricing plan is included in the agreement for payment for additional items.