Standard interior door

A standard interior door in the United States measures 80 inches (203 cm) tall and 32 inches (81 cm) wide, with a thickness of 1.375 inches (3.5 cm). This is the most common size for bedroom, bathroom, and closet doors in residential construction. This page covers the exact dimensions, common size variations, and rough opening requirements.

Dimensions

Common width variations

While 32 inches is the most common width, interior doors also come in 24, 28, 30, and 36 inch widths depending on the room. Closets and small utility rooms often use 24 or 28 inch doors, while 36 inch doors are increasingly common for main bedrooms and to meet accessibility requirements.

Interior door size by room type

Door height stays fairly consistent at 80 inches across room types in standard residential construction, while width is adjusted based on the room’s function and, increasingly, accessibility guidelines that call for wider clearances.

Rough opening requirements

The rough opening in the wall framing needs to be larger than the door itself to accommodate the frame and allow for shimming during installation. For a standard 32-inch door, the rough opening is typically about 34 inches wide and 82 inches tall, adding roughly 2 inches to each dimension.

Door thickness standards

Interior doors are almost universally 1.375 inches thick, noticeably thinner than exterior doors, which are typically 1.75 inches thick for better insulation and security. This thickness difference means interior and exterior doors are not interchangeable even at matching height and width.

Frequently asked questions

What is the standard size of an interior door?

80 inches tall by 32 inches wide, with a thickness of 1.375 inches, though width varies by room type.

How wide should a bathroom door be?

Typically 24 to 28 inches, narrower than bedroom doors since bathrooms are usually smaller rooms with less need for wide furniture clearance.

What is the rough opening size for a 32-inch door?

About 34 inches wide by 82 inches tall, allowing roughly an extra inch on each side and at the top for the door frame and shimming.

Is an interior door the same thickness as an exterior door?

No. Interior doors are typically 1.375 inches thick, while exterior doors are thicker at 1.75 inches for better insulation and durability.

What door width is required for wheelchair accessibility?

36 inches is the commonly recommended width for accessible doorways, providing enough clear width for a wheelchair to pass through comfortably.

Related objects

• Queen mattress
• Office desk
• Dining table
• US Letter paper