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Bi Fold Repairs - Save Money and Keep Your Home Secure If your bifold doors are difficult to open or allow drafts, it is likely that the hardware has deteriorated. It is in need of repair. If you don't take care of these issues, it could lead to a costly repair bill. Whether your internal or external bi fold doors are glazed or solid, they are susceptible to wear and wear and tear. Regular servicing will help minimise the risk of damage. Locks They are beautiful and practical addition to any home.