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Bi Fold Repairs - Save Money and Keep Your Home Secure If your bifold doors are difficult to open or letting in drafts, it's likely that their hardware is degraded and requires repairing. In the absence of a solution, these issues could result in a huge repair bill. If your exterior or internal bi fold doors are glass or solid, they are susceptible to wear and tear. Regular maintenance will minimise the damage. Locks Bi fold door