I am going to be the consultant sub to a structural engineer of mine for a feasibility study of a small project. I am wondering which aia contract to use?An architect agreement is a legal document that outlines the obligations and rights of the parties involved, typically in a development project. In conjunction with the execution of this agreement, the Client must submit to AIA San Antonio both of the following documents:. Build contract is a legal document and project delivery system often used in construction. Click here to learn how they work and their benefits. Will C. DeVeau, TDSHS Individual Asbestos Consultant. You can create a letter of agreement as a good compromise and use it to educate clients, but you need legal help to draw up the letter. This practice note discusses the basics of a defect claim against a designer or contractor.