Police were called in to investigate a fire at a heritage-listed house next to Harris Street Reserve on Sunday.
Smoke could be seen pouring out of one of the windows as the fire brigade arrived on scene shortly after they got the call at 12.53pm, but crews were quickly able to extinguish the blaze.
Senior station officer Owen Maslen said rubbish in one of the rooms was set alight and, because of the quick response, crews were able to contain the fire damage to one room.
“We were fortunate that we had an early call on it,” he said.
The fire damaged the floorboards of the house which was built in 1874, and was formerly the residence of the manager of the Warrnamboool gasworks that had also occupied the site for more than 100 years.
The house was attacked by vandals in January.
“There’s no windows in the place and all the doors have been smashed and it’s just been a free-burning fire,” Mr Maslen said.
Anyone with information is asked to contact police or Crime Stoppers on 1800 333 000.