Police are investigating a deliberately lit house fire on Hargrave Crescent, Mayfield last night.

Tasmania Fire Service and Tasmania Police were called to the vacant house about 10:40pm and arrived to find the structure well alight.

Fire crews extinguished the fire, but the house was completely destroyed.

Anyone with information that may assist the police investigation is asked to contact Launceston CIB on 131 444 or Crime Stoppers on 1800 333 000. Information can be provided anonymously.