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Bi Fold Repairs - Save Money and Keep Your Home Secure If your bifold doors are difficult to open or let in a draft, it is likely that the hardware has deteriorated. It is in need of repair. Ignoring this problem can cause costly repairs. No matter if your external or internal bi fold doors are glass or solid, they are vulnerable to wear and tear. Regular servicing will help minimise the damage. Locks Bi fold doors are stunning and functional additions to any home. However, like any door