Work has started to build a new �1.2m exhibition hall at the Norfolk Showground – designed to be the county's largest indoor venue.

Construction got under way this week on the project, which is part of a major facelift of the Costessey site to create a two-storey 3,000sq ft venue capable of holding 4,000 people. As well as a state-of-the-art new reception, there will be a redesigned interior with a flexible ceiling pattern for sound absorption and to block out most natural light. New internal wall cladding will give a modern look to the building as well as further improving acoustics. There will also be a soundproof partition, meaning clients can choose to rent the site as a whole or in thirds, with a view to offering flexibility to cater for events of all different shapes and sizes.

John Purling, chief executive of the Royal Agricultural Association, which owns the site said: 'We have seen a healthy growth in the number of events being held in the exhibition hall in recent years.

'As well as providing a more pleasant environment for existing customers, the improvements will also enable us to attract new customers. The improved acoustics will make it an ideal venue for music and theatrical productions.'