Stairwell requires building permission and an additional feeStairwell requires building permission and additional feeStairwell requires building permission and additional feeStairwell requires building permission and additional feeStairwell requires building permission and additional feeStairwell requires building permission and additional feeStairwell requires building permission and additional feeStairwell requires building permission and additional feeStairwell requires building permission and additional feeStairwell requires building permission and additional feeStairwell requires building permission and additional fee