The Original Mansion was built by Thomas Sewell following his acquisition of the land in 1761. Edmund Boehm purchased the Mansion in 1796 and enlarged the property with the addition of a Doric Portico, a Conservatory and an Orangery. The property remained largely unchanged until it's purchase by Sir Edward Colebrooke who, in 1868, made considerable modifications to both wings of the building. In 1910 the estate was sold to Friedrich Gustav Eckstein. Eckstein then demolished Sewell's original building to replace it with the current Mansion. Built largely on the same foundations the new Mansion had 91 rooms and was said to have cost £250,000. Such was the splendour of the new mansion that it became known as "The Wonder House of Surrey"
It is said that Eckstein's wife considered the new Mansion "too small" and refused to take up occupancy. Eckstein moved in alone but at the outbreak of World War 1 offered the Mansion to the War Office for use a an auxilliary hospital. Thus it remained until 1921 when the estate was purchased by Miss Susan Schintz. In 1932 the Mansion was acquired by Ottershaw College to house a boarding school for boys. At the outbeak of World War 2 the building was leased to the Vacuum Oil Co. for use as an administrative centre. Following the war the Mansion was purchased by Surrey County Council who then established Ottershaw School in 1948. The school closed in 1980 and the building was sold to developers, DeltaHome Ltd. They created 24 seperate homes within the building and that is how it remains today. It was during the conversion to private apartments that the Mansion acquired listed building status.
We are indebted to John Athersuch for his detailed research into the history of the Mansion and the wider Ottershaw Park estate. John has documented his research into the excellent book "An Illustrated History of Ottershaw Park Estate 1761-2011" Copies are available from John - firstname.lastname@example.org A link to an online version is shown opposite.