Detectives at Glenorchy are investigating four deliberately lit fires on a street in Moonah.

Between 25 June 2014 and 16 August 2014 there have been four fires at two homes in Johnson Street, Moonah.

The fires have caused significant damage to the residences. The buildings were unoccupied at the time of the fires.

Tasmania Fire Service and Tasmania Police attended the fires, which are now being treated as suspicious.

Detectives are appealing for assistance from members of the community who may have observed any suspicious activity or people in the vicinity of Johnson Street, Moonah between these dates.

Anyone with information can contact Detective Adams directly at Glenorchy on 62302639 or anonymously through Crime Stoppers on 1800 333 000.