Founded in 1080, St Mary's retains many original and later features including ornate stained glass windows and Victorian wall paintings. The church is a Grade I listed building. and its closed churchyard has over 1,000 memorials including a memorial to Archbishops Manners-Sutton, Howley, Sumner, Longley and Tait who are all buried at Addington. There is also a war memorial at Addington and 13 war graves within the churchyard from both world wars.