Lundqvist Trävaru AB, manufacturer of easy to assemble building kits, aims to streamline their entire production line through an investment into a new IT-system. As a first step, an interactive webbased 3D offering tool is being developed with the purpose of replacing some of the personal guidance required for a building project. The tool gives the customer a possibility, with the help of a simple web interface, to design their building with different options e.g panels, roof angle or extra additions as insulation or roof gutters.The application shows the customer a 3D visualization of the building and also gives a price calculation in real-time. This thesis explores how one can develop a web based 3D application for building projects with a requirement of dynamic content.