The valuation officer may change the value of a property if the circumstances of the property have changed (for example: an extension has been built on to a factory, an office has been divided into two or more parts). This can be an increase or decrease of the rateable value. The valuation office will notify the owner/occupier of the property and the local authority. The business rates payer may ask for a change in the rateable value, however certain others, including the council, who have an interest in the property, can also ask for a change in value.