Drawing 190 is probably a very early record drawing of Soane's concept for this room, as indicated by the inclusion of bookshelves. A comparison with a watercolour of the Breakfast Room in the British Library collection (BL119) indicates that this room was first intended as the Library and that Soane altered its use later in the design process. Bianca de Divitiis draws attention to a note in Soane's hand at the bottom of the latter drawing; 'Sketch of the Library since alt. to Breakfast Room'.

Soane's preliminary drawings for the Breakfast Room at Pitzhanger introduce many familiar concepts to the design. The plans of 192-194 show the design for the ceiling - a shallow dome sitting on almost flat spandrels. An urn is sketched in drawing 194 - probably a reference to the Cawdor vase which Soane had bought early in 1800 and was eventually positioned in the Breakfast Room. Indeed, the decorative scheme of the Breakfast Room was partly designed around this important object.