1. Cost - Many people think that "considering the cost" requires you only to check the price tag. However, you should realize that there are a lot of different types of costs attached to the purchase of a sliding door.
a) Purchase cost - The purchase price of the door depends on many factors. One such factor is the material. There are some types of materials which cost more than others. Another factor that affects the cost would be the amount of technology that goes into the building of the door.
b) Installation cost - installing a sliding door can't really be called a DIY job, although doing it by yourself is possible. You need expert help in order to make sure that the door works properly. Installation costs vary, and the installation process itself can be over in a matter of minutes.
c) Operation - You need to know how much you have to pay for the energy. You also need to know how much it costs to keep the doors in top condition.
2. Safety - Look for various safety features. Most doors today have features that prevent the doors from closing when an object blocks their path. This is great, especially if many kids pass through those doors. You wouldn't want someone to be crushed between closing doors, would you?
3. Aesthetics - Design and aesthetics are very important. Why? The door is visible to a lot of people. Because of this, the door you get could have a big impact on the way the whole place looks. You need to pick a design which helps retain the organic unity of the whole building.
Getting the right door is all about making a great investment. After all, you will be spending cash on it. Considering the factors above can definitely help you make sure that you are making a very smart move.