A fire believed to have been started in a bedroom, has completely engulfed a single story home at Stirling Crescent in Aldinga Beach.

All occupants were quick to vacate the house and raise the alarm with emergency services just after 2.30 am this morning, Wednesday 14 Febraury.

Five CFS trucks with approximately 25 firefighters have been on scene working to extinguish the blaze.

At this stage the house looks to be a total loss with an estimated damage cost of between $300,000 and $400,000.

SA Police are also on scene and SA Ambulance were requested. The cause is currently unknown and fire cause have been notified.