Lady Bute's Bedroom comprises the upper two floors of the Keep, with a coffered, double-dome ceiling that rises up into the tower's conical roof. The room was completed after Burges's death and, although he had created an outline model for the room's structure, which survives, he did not undertake detailed plans for its decoration. His team attempted to fulfil his vision for the room—"would Mr Burges have done it?" William Frame asked Nicholls in a letter of 1887—but the interior decoration was the work of Lonsdale between 1887 and 1888, with considerable involvement from Bute and his wife.