What is the standard size of an interior door?

• A. 6'8"
• B. 7'6"
• C. 7'2"
• D. 7'

Answer: (A)

The standard interior door height is 6 feet 8 inches (80 inches). This height has become the default in residential construction because it fits typical wall heights and framing, provides comfortable headroom with room for trim and hardware, and aligns with the common stock door products used by manufacturers. Taller doors, like 7 feet, 7'2", or 7'6", exist for specific styles or premium homes, but they require different framing and aren’t the default. So the best answer is 6'8".