Okla. Stat. tit. 59, § 4002

The owner of property, or an owner’s agent, or a lumber yard or building material center, or its agents or employees, who attempts to determine cost estimates, determine various material options, secure a detailed list of materials, or prepare a material takeoff based upon a drawing, plan, computer program calculation or any professional source of written information for his or her construction project, shall not be held liable for the acts of, nor deemed to practice, a profession or trade required to be licensed in this state.