We purchased a 1930's end terrace at the end of Feb this year and the building surveyor found the above cracks (under some dodgy wallpaper).... house is brick but first floor windows have tiles on the outside and we can't see any movement or cracks there, downstairs is brick and looks ok. A structural engineer has said the only way to see if the problem is structural and was caused by the installation of the windows less than two years ago, is to take out the windows and look to see what has been done (sounds like a nightmare). My questions are, is it true that the guarantee for the workmanship of the window installation doesn't apply now the house has been sold AND how on earth do we go about taking out the windows? Do we try and get the original installers to do it while the engineer is present? Any experience of this would be greatly appreciated. ps the cracks go all the way to the floor and you can see daylight through one of them!