Police are investigating two separate suspicious house fires which occurred overnight.

Tasmania Fire Service and Tasmania Police were called to a vacant property in Newbury Place, Bridgewater, about 9.10pm last night, following a report of a vacant structure on fire.

Emergency services were called to a separate vacant property fire in Kintail Crescent in Newstead in northern Tasmania about 9.15pm last night.

Tasmania Fire Service investigations have determined that the fire was deliberately lit in both cases.

Investigations into both incidents are ongoing.

Anyone with information should contact Police on 131444 or report anonymously to Crime Stoppers on 1800333000 or crimestopperstas.com.au