The Ultrapanel system used within hup! walls combines timber, steel and high-performance insulation in a unique patented design. By combining the strength of steel, the versatility of timber and exceptional thermal efficiency, Ultrapanel creates a robust, highly insulated structure that minimises thermal bridging and delivers outstanding energy performance.

Because hup! walls are lightweight, they can often be installed on an existing suitable base, where heavier traditional brickwork may require new foundations. Their lighter construction also makes the panels easier for installation teams to handle, helping to speed up the build.

hup! walls are also slimmer than traditional brick-built walls, creating around 10–15% more usable internal floor space within the same external footprint.

Rex manages design, planning and build as one team, so several trade handovers disappear from the schedule entirely, a real factor in modular extension cost. hup! walls and roofs are manufactured off site to a fixed specification, so your quote holds once the build starts, rather than creeping upward the way a traditional extension often does once foundations are opened up.