A learner driver has seriously injured his own mother in a car accident on Brisbane's northside.

Emergency crews were called to a Department of Transport building in Zillmere about 1:00pm AEST.

The woman had been waiting for her son to complete a driving test.

It is believed the car crashed into a row of seats where the woman was sitting.

She was pinned to a wall by the car.

She has been taken to Royal Brisbane Hospital in a stable condition with a partially severed leg.