Hi, House is approx 10m x 6m footprint. Not sure of the height, but typical 2 storey so must be around 5-6m to the eaves on the main walls, higher on the side walls which meet the ridge). Cost didnt take into account window area, apparently the extra work around windows balances the saving of less material (having seen the effort sorting out around windows they should probably be charging extra). From memory it was roughly £13000 - its not cheap but since we would have needed a fair bit of render work anyway we took the opportunity to combine it with the insulation improvement. My father in law is considering doing a similar thing to you on one wall which gets all the weather on their property, but it is expensive unless the insulation aspect really matters to you. S.