The back drawing room was located at the back of the house on the first floor, behind the first drawing room, and above the back parlour.

Adam's interior decorative schemes for the ceilings and chimneypieces at 25 Grosvenor Square are thought to have been executed, but this work must have been removed later as there was no evidence of an Adam interior prior to the demolition of the house in 1957. See scheme notes.