Thomas Halsey (1731–1788) MP erected a new mansion, Gaddesden Place, to Wyatt's design,[3] about a mile south-west of the Golden Parsonage.

[5] The building was purchased in 1984 by the technology entrepreneur Charles Moir, founder of the software company Computer Concepts, now known as Xara.

On the south side, overlooking the valley, there is a large central portico of five bays (rebuilt 1905) supported by ionic columns.

[7][1] At the entrance to the grounds on Red Lion Lane there is an 1870 half-timbered brick and Bath stone gatehouse lodge, which is Grade II listed.

[12] Other productions that have shot at Gaddesden Place have included Fanny by Gaslight (1944), A Kiss Before Dying (1991), Little Britain (2000–07), the ChuckleVision episode "The Mystery of Little Under Standing", The Legend of Tarzan (2016), The Current War (2018), Slaughterhouse Rulez (2018), and Holby City (s21e01 2019).