There are around half a million Listed Buildings in the United Kingdom
Listed Buildings
 There are around half a million listed buildings in the United Kingdom. These are buildings that have been placed on the Statutory List of Buildings of Special Architectural or Historic Interest by English Heritage in England, Cadw (The Historic Environment Service of the Welsh Government) in Wales, Historic Scotland in Scotland and the Northern Ireland Environment Agency (NIEA) in Northern Ireland. These are protected structures with special architectural and historic interest, the older a building is, the more likely it is to be listed. All buildings built before 1700 which survive in anything like their original condition are listed, as are most of those built between 1700 and 1840. The criteria become tighter with time, so that post-1945 buildings have to be exceptionally important to be listed. A building has normally to be over 30 years old to be eligible for listing. Many of Britain's inns are listed so we show a half timbered symbol to show this. A listed building may not be demolished, extended, or altered without special permission from the local planning authority, which typically consults the relevant central government agency, particularly for significant alterations to the more notable listed buildings. Although most structures appearing on the lists are buildings, almost anything can be listed, other structures such as bridges, monuments, sculptures, war memorials, and even milestones and telephone boxes  are also listed. Ancient, military and uninhabited structures, such as Stonehenge, are sometimes instead classified as Scheduled Ancient Monuments. Categories of listed buildings Grade I buildings are of exceptional interest, sometimes considered to be internationally important; only 2.5% of listed buildings are Grade I Grade II* buildings are particularly important buildings of more than special interest; 5.5% of listed buildings are Grade II* Grade II buildings are nationally important and of special interest; 92% of all listed buildings are in this class and it is the most likely grade of listing for a home owner.
English Heritage Listed building map search