A controversial new 1,000-room palace built for Turkish President Recep Tayyip Erdogan will cost about £385m ($615m) – nearly twice the previous estimate, Turkish officials say.

Known as Ak Saray (White Palace), it was built on a forested hilltop on the edge of the capital Ankara, on more than 150,000 sq m (1.6m sq ft) of land.

Mr Erdogan opened the palace on 30 August after becoming president.

His AK Party has dominated Turkish politics for more than a decade.