Construction of the 256sq m extension and seismic strengthening to bring the building up to modern standards began just over a week ago.
The extension will house the Central Otago Command Unit, offices, a uniform room and a breathing apparatus filling station.
Mr Anderson said strengthening the building fitted with Fire Service policy that in the event of a natural catastrophe, the fire station would be the last building standing.
Alexandra was lucky to be given the opportunity to create a better facility, and was ''very'' excited about the work being done, he said.
While building was carried out, fire appliances were stationed in Hinton's Packhouse on Chicago St.
The extension will be on land previously occupied by a house, where the station's caretaker, the late Sam Corrigall, lived until about three years ago.
The fire station was built in 1968.
Construction would not have any operational effect on the Fire Service, he said.
Work was expected to be completed in early October.