Height of the ceiling If your house has a ten-foot ceiling, the tops of your windows and doors should be eight feet. Anything lower than that and you won't get the full benefit of any insulation you put in the room. The size of your door or window will determine how high it can be and still open and close properly.
Width of the doorway Or to be more specific, the width of the opening, including its jambs (its side walls), must be at least 39 inches for maximum heat loss reduction from a single-glazed unit. This is called the "Minimum Clear Opening" or MCO. The MCO allows enough space for people to pass through without touching the wall surface behind them.
Length of the doorway Or, again, the length of the opening, which includes its header (the top piece of wood above the doorframe) must be 96 inches for maximum heat loss reduction from a single-glazed unit. This is called the "Maximum Clear Opening" or MCO. The MCO allows enough space for large equipment (such as a delivery truck) to pass through without hitting the walls on both sides of the door frame.
An 8-foot-tall door will not function with an 8-foot-tall ceiling height and may appear odd with a 9-foot-tall ceiling height. Taller doors are better suited to ceiling heights of 10 feet or more. Using a higher door will cost more than using a standard-height door. An 8-foot-tall door can usually be had for under $100; a 10-foot-tall door can usually be had for over $200.
The main advantage to using an 8-foot-tall door is that you get to use more storage space. But if you don't need more storage space, then the extra money you spend on 8-foot-tall doors isn't going to save you much time or effort down the road.
There's no real right or wrong here - just depends on your situation.
The minimum clear height of the door opening is 6 feet 8 inches (2032 mm) or 78 inches (1981 mm) measured from the top of the threshold to the bottom of the stop. Other types of doors are not needed to meet these minimal specifications. However, the use of larger doors will allow more light into your home and give your impression of luxury and style.
The minimum door size is 40 inches wide by 64 inches high (1030 mm by 1612 mm). This allows enough space for people to pass through without touching the sides of the door. The maximum size depends on the type of door you choose. Options include single-hung, double-hung, and sliding doors.
Single-Hung Doors: These doors hang on one side when closed. They can be opened from either direction but not from the inside of the room because there's no way to close them. Single-hung doors are easiest to open when they're made of lighter materials, such as wood or fiberglass. They look best in traditional homes with limited remodeling work.
Double-Hung Doors: These doors hang on two sides when closed. They can be opened from both directions, allowing access to the inside of the room from both the outside and the inside. Double-hung doors are most common and come in a variety of styles including colonial, country, modern, and sleigh.
Anything less than seven feet, nine inches in height may seem cramped—and that figure relates to the final space's height. Finishing the ceiling and floor will reduce headroom by at least a few inches. To obtain a completed height of seven feet, nine inches, the unfinished space must be at least eight feet high.
If you plan to use the basement for storage or as a family room, then the ideal height would be 8-10 feet. A basement can be used as a bedroom if it is 10-12 feet high.
A basement should be fully functional; it should not be used as a playroom or hobby room. If it is going to be used for any of these purposes, then it should not be below ground level. The basic requirements for a functional basement are that it has to be dry and free of hazardous materials. It should also be well lighted so that it is not needed during the day when sunlight is sufficient.
A finished basement requires special care because there are no walls to protect from sudden changes in temperature. The air inside the basement is exposed to temperatures ranging from that of the outside cold winter weather to the heat of summer days. This can cause problems for things like plumbing and heating systems if they are not installed properly. Basements are also very susceptible to flooding. This can cause extensive damage to their contents.
It is important to remember that a finished basement is living space too.