A listed building is a building of "Special Architectural or Historic Interest". The official listing is compiled and managed by English Heritage and is frequently reviewed and changed.
You will need to get listed building consent from the council before carrying out any building works that affect the character of a listed building. This includes internal and external works, structures touching the listed building and separate buildings within its curtilage.
If you are the owner of a listed building you are responsible for looking after it. The council can insist that owners of listed buildings carry out any works to preserve the building. Further support and advice for the owners of listed buildings is available from English Heritage.
Any work that would affect the character of a Statutory Listed Building needs prior consent. This includes internal work as well as external and any works that involve alteration or demolition. The requirement for Listed Building Consent is in addition to any requirement for planning permission.