Listed buildings are buildings and structures that are of historical, national and architectural interest. They can be residential or commercial properties, bridges, gardens, and parks.
They are listed to legally protect them from being inappropriately modified, extended or demolished so that their special interest can be preserved.
There are three categories of listed buildings in the UK: Grade I, Grade II* and Grade II. The majority of listed buildings are Grade II, making up 91.7% of the estimated 500,000 listed buildings on the National Register for England.
Any building older than 1700 will normally be listed, as will the majority built between 1700 to 1840.