Hi OP, The question depends on the age of the window in question. We generally find that replacement glazing for older windows can cost half as much as replacing the entire thing. you can find the age of your product by looking at the data plate, it may read something like GGL-1 00AK0000 (its the two letters like 'AK' example you're looking for). Anything older than 20 years is something I wouldn't entertain personally and VELUX wont supply replacement glass for obsolete units. You can get a pane of glass made locally but you'll need the information and thickness of your current pane to be able to get a replacement size.
Hi OP, The question depends on the age of the window in question. We generally find that replacement glazing for older windows can cost half as much as replacing the entire thing. you can find the age of your product by looking at the data plate, it may read something like GGL-1 00AK0000 (its the two letters like 'AK' example you're looking for). Anything older than 20 years is something I wouldn't entertain personally and VELUX wont supply replacement glass for obsolete units. You can get a pane of glass made locally but you'll need the information and thickness of your current pane to be able to get a replacement size.