The house has a five-bay north front with a modest entrance portico. The entrance leads to a substantial square entrance hall with an apsidal niche on one side. The principal rooms are against the south elevation and include a canted projection in the centre.

The verso of drawing 12 shows a rough design of a larger portico for the north front. It has four Doric columns and spans across three bays of the house.

The portico on the recto of drawing 12 was built by Soane in 1791, constructed of Coade stone and, according to Soane's archives, 'based on the Temple of Apollo' (P. Dean, p.182). This drawing was made after the portico was built. Soane made minor alterations to the house, including a new chimney-piece, repairs, furniture restoration and picture cleaning. Building works on the house and the new office wing amounted to £2,663 9s 7d.