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It's may not be worth it. We had a sliding door latch mechanism fail this year and we could not open the door at all. The cost to carefully remove the pane, fix the mechanism and replace the frame on a 10 year old sliding glass door was 80% the cost of replacing the entire door. So we have a new door.
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Pop round and smash the panel before you exchange, then ask for a viewing to measure up for curtains etc and go oooh look at that, you’ll need to replace that double glazing unit but no need for a cat flap when you do mr seller.
Or: plenty of online calculators (eg https://www.glasstops.co.uk/order-online/sealed-unit-rectangle.php)
In process of buying a house with Bi-Fold - 3 panels. One of the panels has a cat flap. We do not have a cat and would want to get rid of it for aesthetic/ energy efficiency purposes. Anyone know how easy it is to replace one pane of the bi-folds (double glazed) and a rough guess at costs? In London and the doors are aluminium. Thanks all.