Be very careful to read any and all terms of your homeowners insurance if you are doing your own chimney repair. If you do use a professional ask for their warranty and also ask for a invoice and bill that can be provided to your home insurance company should it be needed.
Sometimes when home owners add to their home, especially if they add a new level to the house or roof, the chimney will need to be lengthened to stay in compliance with the building code. A stonemason, bricklayer and chimney repair professional may all be needed to complete this type of remodeling, although some companies will provide all services.