But, very few people can afford to do this, so let's try to get it right the first time. Some of the most bothersome problems are the easiest to fix. Hallways in many houses are almost always too small. Frequently, architects or designers stick with the building-code 3 feet minimum width. In my experience, hallways work best when they are a minimum of 4 feet 6 inches wide.
Stairways are the same.
Try to make them as wide as possible. Doorways into rooms tend to be problem areas. Do not overlook the benefits of pocket doors. They can be used in many situations, and they free up 9 square feet of room space in almost all instances. Be sure to use a pocket door frame that has metal stud channels.