Drainage and Ground Reinforcement Grids | Permeable Paving Grids are sold by the sq metre 9 interlinked grids make up 1 square metre. Prices start at £14.30 inc VAT for 1 sq metre dropping to £12.26 inc VAT per sq metre for 56 sq mtrs (1 full pallet) or more. For larger quantities please call 01282 861325.