Drawings 246 and 247 are almost identical, the latter being a worked up version of the former. They show the colonnade from a view point by the service wing looking down to the end of the house. Crimson roses are suggested in beds by the walls of the courtyard and niches with urns and statues line the walls themselves. Presumably, the colonnade provided a covered walkway, to function as a passage from service wing to house proper.

Soane describes the ruins in his 1832 publication for which the watercolours were been made (although these particular ones were not included in the final publication). The colonnade is 'composed of mutilated trunks of ancient columns' - part of the same ruins as the colonnade - and the 'ancient colonnade now forms the communication from the present mansion-house into the offices erected on the supposed site of the original structure'. This concept does not appear in earlier designs and Bianca De Divitiis suggests that the extension of the ruin footprint into the colonnade is a reflection of Soane's altered position regarding Pitzhanger.