The unit in Pioneer Parade was well alight when emergency services arrived about midnight.

According to Tasmania Police, the blaze caused about $180,000 damage.

The cause is still undetermined and investigations are continuing.

The occupant of the unit was not home at the time of the fire.

Police ask anyone who witnessed the fire or has information into the cause to contact Crime Stoppers on 1800 333 000 or Launceston Police on 6336 3701.