Hi, does anyone know how they work out the rebuilding cost. I have recently purchased a 3 bed tenement flat just outside Glasgow. 1 of 6 flats in a 1900 purpose build flats. Each flat is around 120m2 I had a survey done which estimated the building insurance value as £260000. Building insurance is through a factor. I got a copy of the agreement and the building insurance value they are quoting per flat is £554000. So over £3 million for the block. Which seems crazy. I called this morning and the only answer they could give was they base the cost on the total rebuild as opposed to individual flats. This I understand but surely that doesn't equate to extra £280000 need of cover for each property. Any advise on how I can challenge this. I spoke to a neighbour who agreed it is outrageous. Factor is part of title deeds. Thanks