WEST Sussex County Hall in Chichester is now protected from fire, carbon monoxide and even bomb threats.
Southern Fire Alarms used more than 700 products designed by Havant firm Apollo Fire Detectors to protect the buildings.
They consist of a main five-storey building and seven satellite buildings.
One of these is Edes House, a Grade I listed building that was built in 1696.
The Georgian building was bought by the county council in 1916 and used as council offices until the building of the present county hall in 1936.
Today the house is still used for county council meetings during the day and is open for a variety of artistic, ceremonial and cultural activities at other times.
Because of the differences in the buildings, a range of alarm systems had to be used, not least to protect the Grade I Edes House.
David Fell, of Southern Fire Alarms, said: ‘For this installation we had a number of situations where specialist devices were required and Apollo was able to meet our demands.
‘Apollo technology was chosen as it offers a great deal of flexibility when considering maintenance and, if required, spare parts are easily available.’