The preliminary designs for adding to the house of 1792-3 have wings on either side of the house, that is, on the minor east and west elevations. Drawing 45 shows part of the existing offices projecting on the west side overlaid by the new wing and presumably to be demolished; a four column porch replaces the original two column porch.
Drawing 46 has the wings roughly drawn in by Soane with added compartments of about 10 feet wide between the original house and the new wings; the eating room is now to be in the new west wing.
Drawing 47 has an eight column porch/loggia that spans most of the existing building and openings are placed on the inside walls of the wings against the old house.
Drawings 48-50 show a front of two storeys and seven bays with a balustraded parapet and a loggia of eight Doric columns. For drawing 48, the columns and windows are aligned over a precisely drawn pencil grid.