Make sure your contractor has experience with exterior doors. Exterior doors need to be strong enough to withstand significant abuse over years of bad weather. Everything from the sun to the wind can damage exterior doors. As a result, you need to hire a contractor that has experience with selecting, installing, and repairing this particular type of door.

Go with a contractor who carries a reasonably diverse inventory of doors in stock. When a contractor carries his or her own doors in stock, you will have a much easier time deciding on the right door. You will also save a lot of time because the contractor won't have to order out for your door.

If you want to have more than one door installed, consider asking your contractor if he or she is willing to work with you on a bulk pricing scheme. This means that you would get a lower overall price by having a number of exterior doors installed by the contractor.