The standard size for an exterior door is 80 inches by 36 inches which is 6 ft, 8 inches by 3 ft. 96 inches or 8 ft. is now very common for newer homes and stock exterior doors are also commonly available in 30 and 32-inch widths.
Standard widths include 18, 20, 24, 28, 30, 32 and 36 inches. Standard heights include 80, 84 and 96 inches. Customized sizes are available in a wide range of different designs. To measure a prehung door, remove the interior casing and measure the opening.
Some of the most common Standard UK door sizes are:
1981 x 762 x 35mm – The most common internal door size in England & Wales; AKA a 2'6” door! 1981 x 838 x 35mm – The best door size for mobility/wheelchair access; AKA a 2'9” door.
Rather than saying “30 inches wide, 80 inches tall” or “2 feet 6 inches wide, 6 feet 8 inches tall,” they'll refer to the door as a “2/6, 6/8 door,” pronounced “two-six, six-eight.” For a door that is 24 inches wide and 78 inches tall, they'll refer to it as a “2/0, 6/6” door.
No, the door frame will be 32 inches. The door itself will be about one eighth to one quarter of an inch narrower to allow space for opening and closing it.
For example, a nominal door size of 36 inches would fit into a rough opening 36 inches wide. The actual size of the door slab may be slightly smaller than the nominal size, typically by about 3/4 inch on each side, allowing for clearance around the door to ensure it can open and close smoothly.
Typically, main entry doors measure 36 inches wide by around 80 inches high. Depth can vary depending on material. However, you can have doors that are much taller. These might be visually appealing in home designs with a tall or large entryway or a cathedral ceiling.
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.
Some homes may have been built before there were standard sizes for doors, resulting in smaller entryways than average. Today's doors tend to be taller and wider to accommodate modern, busy lives. The Americans with Disabilities Act (ADA) states that doors should be a minimum of 36 inches wide.
On average, an internal door in England and Wales is around wide 762mm (2 feet 6 inches). Doors in Scotland are a little narrower at 726mm (2 feet 4 and a halved inches).
610/686mm (24"/27") – commonly used for small or restricted spaces where a smaller door is required, such as kitchens and bathrooms. 762mm (30") – the 'standard' internal door size in England and Wales. 838 (33") – the door width required for wheelchair access i.e., disability access.
The most common interior door size by far, the one that was used by the majority of builders over the last few decades, is 762mm x 1981mm. This equates to a standard internal door width of 2ft 6in and a standard height of 6ft 6in. Other door sizes tend to be used for things like toilets, or walk-in cupboards.
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.
It's not a standard, it's just a common practice. There are egress and fire code rules which may require at least one minimum 36″ door, but nothing requiring a smaller door elsewhere. So, common, but exceptions are also very common. 36″x 80″ doors are also popular because they are required by building codes.
The foundations are set in sand and the whole building has shifted a little over the decades, which is why we have variations at the top end. At the lower end the doors are shorter as the ceilings are lower and the rooms smaller in what was (when it was built) the servants quarters and the kitchen etc.
According to the ADA, any door opening should be a minimum of 32 inches wide and a maximum of 48 inches for easy wheelchair movement. The same size would apply to a home improvement store or a home where you need to move wide equipment. For your basic interior doors, standard sizes will be between 80x32 inches.
For a 36” door in an office occupancy, the exit capacity is 120 persons (1.5 units X 80 = 120). For a 44” stair in an office occupancy, the allowable exit capacity is 120 persons (2 units X 60 = 120).
The standard bedroom door size is usually 32 inches wide and 80 inches tall. The typical thickness is 1 3/8 inches. These dimensions provide enough room for most people to use the doorway without hitting their heads or brushing the sides of the frame.
The most common dimensions for smaller doors are 1981 x 610 x 35mm or 1981 x 686 x 35mm. For mobility accessibility and wheelchair access, a wider door, typically 1981 x 838 x 35mm, is advisable.
