[2][3][4] The house and lodges are built from concrete and faced with honey coloured hamstone, a form of limestone mined in Ham Hill in Somerset.

[5] Christopher Warman, writing in The Times in 1987 wrote that Hamstone House was perhaps "the most important architectural centrepiece of St Georges's Hill...and looks like the bridge of a huge ocean going liner".

[5] Richard Durman in his 2006 book Ham Hill: Portrait of a Building Stone describes the style of Hamstone House as "ashlar faced, simple Classical lines, and some good carved details".

[7] Ian Nairn, writing in the 1971 Surrey edition of the Pevsner Architectural Guides, described the house as "Neo-Classical with a big gatehouse and suntrap plan".

Matthew wrote that 'even in the midst of the quasi-rural grandur' Hamstone House stands out like the 'Duchess of Windsor's flamingo brooch in a local jewellers window' and the grounds as 'eight acres of tall trees and woodland walks, beds of heathers and a formal rose garden that would not look out of place in the grandest of crematoria'.