Panelized offsite construction is a building method where wall panels and floor cassettes are manufactured in a factory using CNC precision, then shipped flat-pack and assembled on-site. Panels arrive with windows, doors, cladding, insulation, sheathing, and MEP (mechanical, electrical, plumbing) pre-installed. This delivers up to 30% lower project cost, 50% faster delivery, and 90% less waste than traditional stick-built construction.