There are many resources you can use and places you can look to find a good and reputable garage door repair tech. Check the internet, as many websites now allow customers to rate and review companies and services.
You can look over the feedback of other customers and see how they felt about the experience. It is also always helpful to ask around with neighbors, family, friends, and work colleagues who may have had the same or a similar repair need. Finally, check your local phone directory and choose a listing that most closely matches your needs.
What to Ask
When you decide on one or a few establishments to contact, there are a few simple questions you can ask to determine how much the job is going to cost you and how long it's going to take. The following are some good questions:
"What is your typical hourly rate for general service?"
"Do you have your own parts warehouse or do you have to order parts?"
"Are you very busy?" It can be a bad sign about their reputation if the company is not busy at all, but equally as bad for you if they are overwhelmed and may show up late or not at all.
"Can you give a specific appointment time?" (Some companies give vague time windows for appointments; you want someone who is prompt and specific.)
Your chosen servicer likely won't be able to give an official diagnosis of your door problem until they actually have the chance to see it in person (but they may be able to provide you with their hourly rate over the phone at the very least).
If it's not a simple repair and things look grim, always request an estimate before letting them go ahead with the project. It may be expensive and you have the right to search for competing estimates before making a decision. Even if you choose another provider for the actual repair, you should still pay the original technician for their time and diagnostic service.
You can avoid costly repairs by performing routine maintenance on a regular basis. It takes very little time and is easy to do. Check the tracks and all of the nuts and bolts that are part of the mounting system to make sure nothing is lose or obstructing the door. Keep everything well lubricated and check the springs for signs of rust or wear. You can usually replace this yourself if you need to.