Police are investigating a house fire in Bridgewater this afternoon, after fire investigators determined it was likely to be deliberately lit.

Emergency services were called to the scene on Scott Road about 12:40pm.

While firefighters responded quickly and prevented the fire from spreading, the residence was significantly damaged.

A 17-year-old, the only occupant at the time, was taken to hospital with smoke inhalation.

Anyone with information is asked to contact police on 131 444 or Crime Stoppers on 1800 333 000 or at crimestopperstas.com.au. Information can be provided anonymously.