thornage hall is a former grange of the bishops of norwich. there has been a manor house on this site since the time of the normans. the hall was built c. 1482 by bishop goldwall of norwich. after the dissolution of the monasteries the hall was given to sir william butts by henry viii. in the 17th century both ends of the hall were demolished and remodelled, but the hall windows and doorways in the centre block were retained. in 1988 a 17th-century sewer tunnel was rediscovered. nearby there is a large brick dovecote, dating from 1728, and barns of flint and brick dating from 1718 and 1727.