You can find out whether a building is listed by consulting the National Heritage List, available on the Historic England website. This may be searched conventionally using address details or by using their map search facility.
All listed buildings are given a ‘list description’. For very recently listed buildings, this will relatively comprehensive, offering very clear reasons why it was selected. However, the majority of older entries have a short description sufficiently detailed to identify it from neighbouring properties. Such list descriptions are for identification purposes only and do not include every feature of the building that may be of interest. They may not mention the interior at all, other than to record that it has not been inspected. It is however crucial to appreciate that the entire building, both externally and internally is protected by the listing.