Because of their rough nature, drawings 158-160 must be Soane's earliest designs for the gated entrance. Drawing 159, dated '1800', presumably refers to some point after the beginning of August, after Soane's purchase of land at Pitzhanger. Drawings 158 to 160 are ordered here according to completeness.

At this point Soane's ideas centre on a simple design with paired pilasters surmounted by pediments, in drawing 159 with antefixae, framing the central gate. At this preliminary stage all three designs are almost austerely Classical with very little ornament. The use of flint in the final structure is suggested in drawing 160, however, by the piers' speckled pattern.