Architects must use written contracts when contracting to provide architectural services in California. Since January 1, 1996, California law has required that any architect who agrees to provide architectural services to a client must have a written contract.This article will guide you through the seven essential steps to form a Professional Architecture Corporation in California. CA requires that a signed, written contract be in place before a licensed architect performs any services. An architect shall use a written contract when contracting to provide professional services to a client pursuant to this chapter.