Mike Thorpe Windows can also repair and maintain your existing uPVC windows and doors. We can replace steamed up double glazed units, discoloured door panels, handles, letterboxes and knockers. Door and window locks can all be replaced no matter when they were installed or who by. If your doors or windows are catching, draughty or just stiff, they can all be adjusted and brought back to new for a fraction of the cost of replacing the entire window or door.