Standard garages are structurally engineered to house a vehicle, meaning they are built with uninsulated single-skin brick walls and cold concrete slabs that lack protection against rising ground moisture. At Alltrades Builders, we completely upgrade the building’s thermal envelope. We lay a heavy-duty, cross-laminated damp-proof membrane (DPM) over the floor slab, pack the walls and ceiling joists with high-performance rigid insulation boards (like Kingspan), and build a fully insulated cavity wall where the old garage door used to be.