 After the war , the architect A. G. Biggs carried out substantial additions to the castle between 1962 and 1968 , including remodelling the western range to provide for more female accommodation , using stone from the second East Cowes Castle , an 18th and 19th @-@ century stately home , which had been demolished the previous year . A prefabricated conservatory extension followed in 1988 , and a new pavilion designed by Sir Thomas Croft was added in 2000 . 
