All of our prices are available to obtain an online quotation without the manual intervention of manual price hiking. Granite worktop prices are known to range on an average from £60 to £440 per square metre, and the dealer, at his discretion could decide whether to include the cost of installation in these prices.Those seeking cheap granites may find discount granite at a price of £40 per square metre excluding installation.The stone itself is relevant only marginally in the kitchen worktop prices. Finishing (half /full round), transportation and installation are the additional factors that render it an expensive product.hose seeking cheap granites may find discount granite at a price of £40 per square metre excluding installation. The stone itself is relevant only marginally in the kitchen worktop prices. Finishing (half /full round), transportation and installation are the additional factors that render it an expensive product.