 The house is built of two types of Bath Stone , and is highly picturesque , bristling with turrets and possessing an elaborate roof . The combined effect of the architecture and chosen materials has been described by journalist Sir Simon Jenkins as " severe " . During restoration , stonemasons either conserved or , on occasion , copy @-@ carving new sections , carving new mouldings to replace standard architectural elements that formed the weathering , as well repointing most of the miles of lime pointing . All stone was accurately matched to the original , with <unk> quarry near Tetbury providing Cotswold oolitic limestone . The house , which includes the servants ' wing and the chapel , was made a Grade II * listed building in 1973 , and has since been upgraded to Grade I. 
