Ohio requires all architects to enter into written contracts with their clients unless the services prior to beginning work on the project. A registered architect or architectural firm is required to use a written contract when providing professional services.Determine if the design services are subject to the QBS process. Create your free account and get personalized document recommendations for your needs and buy your documents in minutes. We'll be focusing on the owner architect agreement and we'll refer to some other documents that may be helpful as resources as you complete those forms. State of Ohio Professional Services Agreements for Public Facility Construction. C110-03. 2022-MAR.