You are granted a single-use building license when you purchase a blueprint package. This license permits you to build one home using the provided plans. Please note that the plans are copyrighted, and any unauthorized reproduction, modification, or reuse is prohibited. As for stamps, our plans are not pre-stamped by an engineer or architect. This is because local requirements vary, and you may need to have the plans reviewed and stamped by a licensed professional in your jurisdiction. It is essential to consult your local building department to determine if a stamp is required and to ensure the plans comply with local regulations.