Know what you want. Everyone wants good value. But deciding which aspect of the repair is most important -price, quality, delivery- will help you sort out the options. It is no bargain to compromise your safety or the future value of your car.
For serious damage, ask for an "itemized estimate" rather than a "price quote". This report is a more detailed breakdown of what's wrong with your car. On today's unibody automobile, a shop must have sophisticated measuring equipment to pinpoint all the damage to the millimeter. This diagnosis ensures a more accurate appraisal of both the extent of damage and cost of the repair.
Ask questions: You must feel comfortable with the repair shop. Make sure that your car will be at that location throughout the repair-time. Any reputable shop will be happy to explain the repair-process fully and answer your questions anytime.
Make sure you're satisfied before you commit. Let the shop know you care about quality. Tell them you intend to conduct a careful inspection and test drive after the repair.