Vendor disclosure issue with purchase of property

Hi, I am in the process of buying my first home. The contract states that they have constructed a driveway without council approval and that, after purchase, any issues arising will be my headache. I called the council and they couldn't give me useful advice as to how big an issue this could be, stating it is on a case by case basis.

Has anyone ever run into a similar issue during the purchase process? Would appreciate any feedback. Thank you!