Types of doorsThere are nearly endless types and styles of doors to consider — particularly as exterior door trends (such as barn doors) have become popular in interiors. Before falling for a design, be practical first: How much room do you have? What do you need? 9 kinds of doors to consider:1. Sliding doors are usually made of wood, glass or are lined with mirrors. Many of these doors are used as closet doors when installed in the interior of a house. They take up a minimal amount of space because the doors slide along the wall rather than swing open.