It depends on the size and type of extension. Small porches or flat roof extensions are very reasonably priced. More substantial two storey extensions can be expensive. In general, the price is roughly proportional to the amount of space you add to your home.
Bellingham
Bellingham is a district in south east London, in the London Borough of Lewisham. Its neighbouring districts are Catford, Sydenham and Downham. The Ravensbourne River runs through the middle of Bellingham, and to the east and west it is bordered by railway lines running south from Catford.
The true name Bellingham means ‘the water-meadow owned by Beora’s people’, and was the real name of the medieval manor in the area. The name was preserved by the farm in the region, Bellingham Railway Station and the Bellingham Estate. Additional historical names have already been preserved by the road names of the estate, which are linked with King Alfred, who was thought to have been god, the father of the manor of Lewisham, and were taken from the true names of mills, houses and fields in the area.
Bellingham was mainly farmland until the Bellingham Estate was built, mostly between 1920 and 1923. London City Council built about 2600 houses and flats during this time. Bellingham Estate was one of many large estates built by London City Council following the First World War to assist with slum clearance and alleviate overcrowding. As there was plenty of land available most of the dwellings constructed were two-story houses, and there was lots of green, open space.
Today, Bellingham is a localised city centre. Its high street is Randlesdown Road, which has a supermarket, a gym, hairdressers and multiple restaurants and food outlets. It has a sixth form college also, and a church and a library. Bellingham boasts many well-known former and present residents, including the singer/song-writer Kate Bush, the previous Labour Prime Minister James Callaghan, and the footballer Ian Wright.
