Most builders and do-it-yourselfers in the United States use standard-sized doors in home construction and projects. The standard heights and widths allow for ease of buying doors and changing doors once they are hung -- both for interior and exterior spaces.
The standard height for an entryway door is 6 feet 8 inches. The typical entry door is also between 30 and 36 inches wide and is about 1 1/2 inches thick. Speciality doors can be ordered up to 8 feet tall.
Interior doors also follow the standard height of 6 feet 8 inches. This standard allows all doorways to have a uniform look in a home because interior and exterior doors are hung at the same height. Standard interior doors also vary between 30 and 36 inches wide but are usually not as thick as an exterior door.
Sliding doors, or glass doors or French doors, are sold in the standard 6 foot 8 inch height but also come in other sizes, including 6 foot 11 inches and 8 feet high. Sliding doors come in varying widths up to 16 feet wide and can have single- or double-openings.