Abstract: A 3D interactive construction estimating system is provided that includes a computerized interactive ERP/3D design and estimating system for building construction projects and services. The computerized 3D interactive construction estimating system is real-time, visual, and transparent to both the customer and the manufacturer, and allows the customer to design and customize a home or other building with real-time integrated 3D virtual tour, pricing, scheduling, ordering, and financing options. The system includes an ERP system, a CAD system, and a graphical front end that provides the user with a virtual design experience.