Double Glazing Window Repairs If your double-glazed windows are faulty and you want to have them repaired as soon as you can. If the seals have been damaged, it can cause condensation, draughts and make your house less energy efficient. Repairing double-glazed windows is generally less expensive than replacing it. https://www.repairmywindowsanddoors.co.uk/newmalden-windowrepair/