Talking about style of the door, it would be fun. While there are many style of the furniture, door would be one that the style is a little bit slower in progress. As the number of house is increasing, the use of the door would follow it too. For example, one house needs more than one door. They are one door for living room, two bedroom, bathroom, and backdoor. Each of them is wood doors. We can see from the example, one house needs at least five doors. There could be built forty houses in a month. It means two hundreds doors in a month. It shows that there is an opportunity in door business.
Wood door is the example of an interior door. For exterior doors, we can use patio doors as the example. Patio door is a door that is often used at the garden or other open air room. Different to the interior door, exterior door is often painted than varnished. If we see that interior door is usually colored brown, exterior door is often colored white or other paint color. It is because the main material of the exterior door is often made of wires than woods.