Blackfen is a largely residential area of Sidcup in the London Borough of Bexley, South East London; and makes part of the electoral ward of Blackfen and Lamorbey Ward along with Lamorbey. It is situated 10.2 miles (16.4 km) east south-east of Charing Cross. The word "Blackfen" means a black, marshy area. The soil is dark and fertile and the area around Blackfen Road and Wellington Avenue is prone to flooding in extreme conditions.
The housing stock is almost exclusively owner-occupied houses of conventional British design. The sale of the Danson Estate in 1922 marked the beginning of a major period of house building in the area and most of the houses date from the 1930s.
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