What is the standard size of a common door?

The standard size for a common interior and exterior door typically measures 3 feet in width and 6 feet 8 inches in height, which corresponds to the specified answer. This dimension has become widely accepted and utilized in residential construction, making it a common reference point for builders and architects when designing doorways.

The width of 3 feet allows for easy passage, accommodating most furniture and people comfortably, while the height of 6 feet 8 inches aligns with average ceiling heights in homes, ensuring that the door fits proportionately within the space. This size also allows for the door to be easily fitted within standard door frames.

In various contexts, particularly in residential building codes and design standards, this size is referenced often, ensuring uniformity in construction practices. It's essential for students to recognize that while there may be variations for specific styles or functions of doors, this size remains the most standard.