He ordered London-based architect Thomas Edwards[3] to build the Palladian house in 1723.

[1] In the interior, the central east room of the house is panelled with pine wood, while the central south room features arcaded screens and Roman-style Ionic entablatures, with rococo arabesques adorning the fireplace wall.

The main staircase of Trewithen House is cantilevered, and set in a semi circular open well.

[1] The grounds of Trewithen Estate are noteworthy, with a prominent 200 yard-long lawn and gardens containing some rare plants.

[9][10][11] The kitchen garden walls adjoining the service wing to the west of the house are Grade II listed.