Precast concrete buildings by the Easi-Set brand is very well-known as it is the most-used precast concrete building system in the United States. Precast concrete manufacturers across the country have acquired the license to produce our prefab buildings because Easi-Set products are guaranteed durable, economical and customized to the customer satisfaction. Our precast concrete buildings have been a successful product line for over 30 years and counting Easi-Set Modular Building.