It is not known if Adam fitted up the interior of Castle House. According to King it is unlikely that Adam executed any interior decoration aside from friezes, although there is no evidence to confirm this.

It is not possible to assign a date range to these drawings as they are included in a volume of record drawings, drawn directly onto the page rather than pasted in, and all drawn in a single hand. As such, this collection of record drawings appears to have been produced as a complete work - perhaps as a catalogue of Adam friezes - and may have been compiled some time after the work at Castle House.