Additionally, it defines the client and interior designer, so it’s crystal clear who is agreeing to the terms. This clause acts as an introduction and establishes that the document is intended to serve as a legally binding contract between the parties involved. The first section of an interior design contract is known as a preamble. Keep reading to learn what she thinks are the most important provisions for interior designers to include in a contract. To provide you with the best guidance possible, we enlisted the help of interior designer Jihan Spearman, owner of Jihan Spearman Spaces she has drafted many interior design service agreements. 24 clauses to include in an interior design contract