The mansion was built from the years 1850–1855 after the demolition of a house 350 metres south-west of the current site.
[1] The building was designed by Edward Haycock for David Mansel Lewis.
[2] In 1873–1874, a wing was added to the mansion by John Chessell Buckler,[2] remaining virtually unchanged since.
Parts of Heidi, a 2005 live-action film, were shot at Stradey Castle.
[3] In 2016 Stradey Castle experienced a fire that was caused by, as recounted by Claire Mansel Lewis, one of the owners of Stradey Castle, "The sun's rays being reflected by the magnifying mirror on my dressing table onto the curtains" she continued, "Half an hour later, and the house would have been destroyed.