composite decking | wpc decking | modern decking | £3.80 . sale! composite decking board – charcoal black . cheap softwood decking or expensive hardwood decking just can’t compete guaranteed! wpc decking costs. wpc decking costs approximately £26 per m2. this is far less than hardwood decking. wpc decking costs even less than softwood decking if you include yearly maintenance costs that will be .