A woman has been threatened by three men, including one with a handgun, after they forced their way into her house in Adelaide's northern suburbs.

Police said they were investigating the break-in at the Kudla home, which happened about 2:00am.

They said one of the intruders reportedly had a handgun and threatened the sole occupant of the Wattle Terrace house.

It is believed another two people may have remained outside during the incident.

The victim had personal possessions stolen before the men fled the scene in a dark coloured car.

One of the men who entered the house is described as Caucasian, in his 20s and about 178 centimetres tall with short blond hair.

Police said they believed the incident was not random.