Repairs to former Treasurer Troy Buswell's ministerial car for damage sustained when he crashed into several parked cars near his Subiaco home in February cost nearly $15,000, the State Government says.

Education Minister Peter Collier told Parliament that the more than $14,700 in repairs were to be paid by Government insurer Risk Cover and that an insurance excess did not apply.

Mr Buswell pleaded guilty in April to 11 traffic charges relating to a night he returned home from a wedding reception.

The State Opposition says the Premier should insist Mr Buswell pay for repairs to his ministerial car.

Labor leader Mark McGowan says it is unacceptable it is not being paid by the former treasurer.

"I don't think it's fair that taxpayers should be paying this bill, which is clearly Mr Buswell's, and I think this is a significant test for the Premier," he said.

"The government is picking up the tab for Mr Buswell's ....careless driving and that is unacceptable."

Mr Buswell suffered a breakdown after the incident, took leave from Parliament and relinquished his Treasury and Transport portfolios.

He pleaded guilty to the charges and was fined more than $3,000 and banned from driving for 12 months.\

He later revealed he suffered from bipolar disorder and depression, and apologised for his behaviour.