Thirlestaine Hall (Excluding 1940S Wing To North East)

Thirlestaine Hall is a large house, now used as offices, built between 1855 and 1857 for Johan Andreas Frerichs, with the design by architect Daniel Humphris. Around 1909, an observatory was added for John Player, and subsequently altered by G.H. Ryland. The house is constructed of stucco over brick, with ashlar dressings and hipped slate roofs, and is built in an Italianate style.

The building has a double-depth plan featuring a central hallway and a rear range. The main range is two storeys high with three first-floor windows, and an attached two-storey, three-window orangery to the left. The main range exhibits ashlar detailing including rustication to the ground floor, a first-floor band, quoins above, a frieze, and wide eaves supported by brackets. Ground-floor French windows have margin lights, while the first floor features 8/8 sash windows in plain reveals, with sills on feet and tooled architraves with cornices. The central entrance is marked by a Roman Doric porch with paired columns, an entablature with triglyphs and metopes, and a balustrade above. The rear elevation features a canted central bay and similar detailing to the front facade. On the roof of the rear section is an observatory with a copper dome. The orangery has a first-floor band and a crowning entablature, and its ground-floor windows are round-headed with multi-pane casements, including 6/6 sashes and a central 6/6 sash between two 2/2 sashes on the first floor.

Inside, the hall contains a two-story Corinthian columnar screen. The double drawing room to the right features marble fireplaces and heavy plasterwork, including deep acanthus friezes similar to those found at No. 83 Pittville Lawn. Doorcases have architraves with Neo-Classical style friezes and cornices. Several rooms are reported to retain original plasterwork and fireplaces throughout the house.

Thirlestaine Hall was occupied by the American Services of Supply during the Second World War, from 1942 to 1945. A large wing added in the 1940s to the northeast is excluded from the listing.