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How to Go About Repairing Double Glazing Windows Double glazing windows typically come with warranties that protect them for up to 20 years. If you notice a problem you're looking to fix, contact the company that supplied the windows to find out what their policy for repairs. Repairing your double glazing can be simple in some instances. Here are a few of the most common problems that can be resolved. Broken Glass Double pane windows depend on an air-tight seal to keep the inner and outer glass in place.