average door width is 36 inches, and the average door height is 80 inches. When creating accessible doors by ADA building codes, the door opening's clear width is required to be at least 32 inches and with a maximum width of 48 inches.
For the average person, a 30”-wide door will be adequate (though a bit small). However, if you want your home to be accessible to those with disabilities, then a door width of 36” is considered the minimum width.
The standard door width can vary, since there is a ton of variety in sizes and styles of doors. But the standard common door width for US homes is 36 inches. Other very easy-to-find sizes are 30 and 32 inches.
The term “interior door” usually means doors that lead from one room to another or to a room off a hallway. In modern homes, standard dimensions are 80 inches (6 feet, 8 inches) tall, 32 inches wide, and 1 3/8 inches thick. As with anything in life, though, it can vary.
The following are some of the most common standard interior door widths: The standard door width for interior doors is 32 inches. Described as a “2/8” door, this 2-foot 8-inch-wide door is the minimum recommended width required for a passage door.
The most common entry door size is approximately 36” wide by 80” tall. Follow along and learn how to properly measure your exterior door.
Standard Size for Interior Doors
Standard thickness for an interior door is 1 3/8, if your door exceeds 36” or is over 90” in height; the recommended thickness for that door would be 1 3/4 inches. The chart below has a list of widths and heights and what those sizes are generally used for.
For reference, standard interior door widths range from 24"-36" (finished opening). While a standard door height is 80" (finished opening). The difference between a rough opening and finished opening is usually 2-3 inches.
One of the most common front door sizes in American houses is 36 inches wide by 80 inches tall, and almost 2 inches thick. However, not all doors will have these measurements. Doors can be as narrow as 30 inches and as tall as 96 inches, and thickness can depend on the door material.
When deciding how wide you want the passage to be, just remember that most of the furniture sold today will not fit through a doorway that's less than 30 inches wide. This is why 36 inches is the safe width. There's nothing more frustrating than buying new furniture and not being able to fit it through the doorway.
The average bedroom size in U.S. homes is 11 feet x 12 feet (132 square feet). That is the average size when you take into account the standard sizes of master bedrooms, secondary bedrooms, guest suites and their normal variations. So 11'x12' or 132 sq. ft. is the average bedroom size across the board.
Check for Fit
Check the door fit. Ideally, there should be a gap of about 1/8 inch at the top and along each side, and about 3/8 inch at the bottom. Use cardboard spacers or folded matchbooks (four thicknesses equals about 1/16 inch) along with shims underneath to maintain the spacing.
32" for interior doors when possible. 24" only when necessary, and only for closets or pantry.
The standard bathroom door size should have a clear opening of 32 inches and a door width of 34 inches. The 34-inch clear width is considered the universal design for bathroom doors. The smallest allowable opening is 24 inches but this is only allowed if existing walls prohibit any type of modifications.
Tip: Stock slab and prehung doors (panel and flush doors) come in several standard sizes. The typical height is 80 inches, with standard widths of 24, 28, 30, 32 and 36 inches.
Thicker, heavyweight doors offer better protection against damage and impact while making you as an individual feel safe and secure. There's something quite satisfying about hearing the click as you shut a sturdy door. Thicker doors feel better to open and close and symbolise longevity.
Door thickness can be important information to know when you're ordering door hardware. If you skip measuring your door, it's possible to end up with door hardware that won't be able to be properly secured.
For a Single door, the rough opening should be 2-1/2 inches wider and 2 inches taller than the nominal dimensions of the door slab you measured earlier. Example: If you have a 36 x 80 door, your rough opening should be 38-1/2" wide x 82" tall.
If you need to replace a door or frame getting all the measurements right is essential to ensure the perfect fit.
Door widths which are considered standard usually come in sizes of 2/6 (30”), 2/8 (32”) and 3/0 (36”). Standard door heights are 6/6 (78”) and 6/8 (80”). In addition, special sizes can sometimes be custom ordered. A 36” x 80” pre-hung single door will use a rough opening of approximately 38-1/2” x 82-1/4” to fit.