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Norwich Guildhall is an historic listed building on Gaol Hill. It was constructed between 1407 and 1413 and served as the seat of city government from the early 15th century until 1938, when it was replaced by the newly-built City Hall. At the time of the building's construction and for much of its history Norwich was one of the largest and wealthiest cities in England, and today the Guildhall is the largest surviving medieval civic building in the country outside of London.
The Guildhall currently serves as the offices of Norwich Heritage Economic and Regeneration Trust and also contains a Caley's Cocoa Café. It is one of the 12 historic Norwich buildings in the Norwich 12 initiative, a project to develop an integrated group of heritage attractions in Norwich.
Grade I listed. Link

Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: Link