John Crichton-Stuart, the 3rd Marquess of Bute, inherited the castle in 1848. One of Britain's wealthiest men, with interests in architecture and antiquarian studies, he employed the architect William Burges to reconstruct the castle, "as a country residence for occasional occupation in the summer", using the medieval remains as a basis for the design. Burges rebuilt the outside of the castle between 1875 and 1879, before turning to the interior; he died in 1881 and the work was finished by Burges's remaining team in 1891. Bute reintroduced commercial viticulture into Britain, planting a vineyard just below the castle, and wine production continued until the First World War. The Marquess made little use of his new retreat and in 1950 his grandson, the 5th Marquess of Bute, placed it into the care of the state. It is now controlled by the Welsh heritage agency Cadw.