Panelized building systems are an industrialized construction technique in which major building elements such as wall, roof and floor systems are manufactured in a controlled work environment away from the building site (‘off-site’) and then transported to the building site for assembly and installation. This approach allows savings in time, waste and carbon emissions, as well as greater performance and quality control without increased costs. Panelized building systems have become common in new constructions; they can also facilitate retrofits.