Alnwick Castle is the ancient seat of the Dukes of Northumberland and dates from 1138, though much of the visible fabric is 14th century, with important nineteenth additions by Robert Adam (1728-1792) and Anthony Salvin (1799-1881). We have carried out archival research to identify conservation barriers and detailed access audits of all the publicly accessible areas of the castle, including terraces, courtyards and baileys, state rooms, museums and restaurants; subsequently advising on the detailed design of access aids and improvements to maintain and enhance its potential as one of the major visitor attractions of the north of England, as well as a family home.