Kevin McCloud returns to north Cornwall to see one of his favourite Grand Designs, and discover whether Rebecca Sturrock and Gregory Kewish have been successful with their ambitious plans. Their project, to reinforce the walls of an old bungalow and put a new living space on top made entirely of cross-laminated timber, soon ran into difficulties, but now fully complete both inside and out, Kevin finds out whether this innovative house is really big enough to accommodate a growing family.