This plan is dated 1757, during which time Robert Adam was on his Grand Tour, and is drawn in the distinctive hand of Stiff Leadbetter, the architect of the house. This is particularly noticeable in comparison with Leadbetter's survey plan for Shardeloes (Adam volume 31/101).
Bolton suggests that this plan has been preserved by the accident of its inclusion with the Adam drawings. Adam's later pencil annotations, however, suggest that it had been a survey plan drawn by Leadbetter, and later supplied to Adam for his use when designing the interior decorative scheme.
The dimensions given for each room do not always correspond exactly with those for Adam's ceiling designs, and these discrepancies in scale may be owing to changes or inaccuracies in the plan.