What Are Standard Doorway Dimensions?
In the US, the standard doorway width for a single interior door is 32 inches, and the standard height is 80 inches (6 feet 8 inches). For exterior entry doors, the standard width is typically 36 inches with the same 80-inch height. These figures represent the actual door slab dimensions, not the frame or the rough opening.
It is important to distinguish between the door slab size and the rough opening. A “32-inch” door measures approximately 32 inches wide and 80 inches tall. The frame adds roughly 2 inches to the width and 1 inch to the height. The rough opening—the hole in the wall studs—needs an additional 1 to 1.5 inches of clearance on all sides for shimming and leveling. So, a 32-inch door requires a rough opening of about 34 to 34.5 inches wide and 82.5 to 83 inches tall.
Standard Doorway Width and Height: Quick Reference Table
The table below lists common US standard doorway dimensions for door slabs. Remember that these are nominal sizes; the actual slab is often 1/16 to 1/8 inch smaller to allow for clearance within the frame.
| Door Type | Standard Width (inches) | Standard Width (feet) | Standard Height (inches) | Standard Height (feet) |
|---|---|---|---|---|
| Interior Closet Door | 24″ | 2 ft | 80″ | 6 ft 8 in |
| Interior Utility Door | 28″ | 2 ft 4 in | 80″ | 6 ft 8 in |
| Standard Interior Door | 30″ | 2 ft 6 in | 80″ | 6 ft 8 in |
| Standard Interior Door (Common) | 32″ | 2 ft 8 in | 80″ | 6 ft 8 in |
| Standard Exterior Door | 36″ | 3 ft | 80″ | 6 ft 8 in |
| Tall Interior/Exterior Door | 30″–36″ | 2 ft 6 in–3 ft | 96″ | 8 ft |
Nominal vs. Actual Size is a common point of confusion. A door labeled “36 inches” is not exactly 36 inches wide. The actual slab is typically 35 7/8 inches or 36 inches minus a clearance gap. This gap, usually 1/8 inch, prevents the door from rubbing against the jamb. When measuring an existing door, always measure the slab itself, not the frame or the trim.
Standard Doorway Dimensions by Application
Interior Doors
Interior doors prioritize privacy and space efficiency. The most common width is 32 inches, found in most bedrooms and bathrooms built after the 1980s. Older homes often have 30-inch doors. For tight spaces like closets, 24 or 28-inch doors are standard. Hallways and doorways leading to main living areas may use 34 or 36-inch widths for a more open feel, especially in homes designed for easier movement.
Exterior Doors
Exterior doors are wider to accommodate furniture, appliances, and ease of entry. The standard front door is 36 inches wide by 80 inches tall. This width is a de facto standard for new construction because it comfortably allows a wheelchair (which is 30 to 32 inches wide) to pass through. Patio and back doors are often 32 or 34 inches wide, especially if they are sliding doors.
Double Doorway Width
Double doors are common for grand entrances, patios, and wide interior openings. The standard width for a double doorway is 72 inches (6 feet) total, meaning each door leaf is 36 inches wide. Other common configurations include two 30-inch leaves for a 60-inch total width, and two 32-inch leaves for a 64-inch total width. The height remains standard at 80 inches. When planning for double doors, remember that the total rough opening width will be roughly 2 inches greater than the combined door widths to accommodate the frame and the center meeting stile.
How to Measure a Doorway Correctly
Measuring for a replacement door requires accuracy. A common mistake is measuring the trim or casing instead of the actual door frame. Here is the correct method:
- Measure the Width: Measure across the top, middle, and bottom of the door slab itself, from left edge to right edge. The narrowest measurement is your door width.
- Measure the Height: Measure from the top edge of the door slab to the bottom edge, on the left, center, and right sides. Use the shortest measurement.
- Measure the Thickness: Measure the edge of the door slab. Standard interior doors are 1 3/8 inches thick, while standard exterior doors are 1 3/4 inches thick.
- Measure the Rough Opening: For new construction or if you are installing a pre-hung door, measure the distance between the wall studs (width) and from the floor to the header (height).
Jamb Depth is a related measurement that is often overlooked. The door jamb must match the thickness of your wall. A standard 2×4 wall is about 4 1/2 inches thick, requiring a 4 1/2-inch jamb. A 2×6 wall is about 6 1/2 inches thick, requiring a 6 1/2-inch jamb. Using the wrong jamb depth creates unsightly gaps that must be covered with extension jambs.
Terms buyers should know
| Term | What it means | Why it matters when buying |
|---|---|---|
| Nominal Size | The label size of the door (e.g., 30″, 32″, 36″). | The actual door slab is slightly smaller than the nominal size for clearance. You must order the nominal size that matches your frame. |
| Rough Opening | The framed hole in the wall where the door unit is installed. | This is always larger than the door slab. If you are framing a new opening, you must calculate the correct rough opening for the door size you plan to buy. |
| Jamb Depth | The thickness of the door frame, which matches the wall thickness. | A jamb that is too thin or too thick will not sit flush with your wall, creating installation problems and an unprofessional finish. |
| Pre-hung Door | A door that comes pre-mounted in its frame with hinges already attached. | This is the easiest way to replace a door, as it is installed as a single unit into the rough opening. You must know your wall thickness to order the correct jamb depth. |
Related Considerations: Variations and Building Codes
Accessibility Standards (ADA)
The Americans with Disabilities Act (ADA) sets clear requirements for doorways in public accommodations and commercial facilities. These are not guidelines for private homes. The ADA requires a clear width of at least 32 inches when the door is open at 90 degrees. This means the actual door opening must be wider than 32 inches to account for the door’s thickness and hardware. For example, a 36-inch door slab in a standard frame provides a clear opening of about 34 inches, which satisfies the ADA requirement. If you are designing a commercial space or a home intended for a person with mobility impairments, you should plan for 36-inch-wide doors.
Regional and Metric Differences
The dimensions discussed so far apply to the US and Canada, where imperial units are standard. In metric countries (UK, EU, Australia), the standards differ. A common metric door height is 2040 mm (about 80.3 inches), and widths are often 820 mm, 870 mm, or 920 mm (roughly 32.3, 34.3, and 36.2 inches). When importing doors or planning a project outside North America, always confirm the local standard sizes with your supplier or architect. A door specified in inches will not fit a metric frame without modification.
Wall Thickness and Jamb Selection
As mentioned, the jamb depth must correspond to your wall construction. Standard interior walls built with 2×4 studs are 4 1/2 inches deep. Exterior walls and some interior partition walls built with 2×6 studs are 6 1/2 inches deep. If you have drywall on both sides, these are the standard depths you will need. If you are installing a door in a thicker wall, you will need a custom jamb or extension jambs to bridge the gap.
How to Choose the Right Door Size
Selecting the right size involves more than just matching the existing opening. Consider the function of the room. For a bathroom, a 28 or 30-inch door is common, but a 32-inch door is more comfortable. For a bedroom, a 32-inch door is the modern minimum. For a main entrance, a 36-inch door is not just a standard; it is the practical choice for moving furniture and accommodating all potential users. For openings wider than 36 inches, you have two options: a wider single door (up to 42 inches) or a double door system. A single 42-inch door is heavy and requires heavy-duty hinges, while double doors distribute the weight and allow for a wider opening when both leaves are open.
Frequently Asked Questions About Doorway Dimensions
What is the standard doorway height?
The standard doorway height for both interior and exterior doors in the US is 80 inches, or 6 feet 8 inches. This has been the norm for decades. In newer luxury homes, 96-inch (8-foot) doors are becoming more common, but they require taller rough openings and are not a drop-in replacement for an 80-inch door.
What is the main door size in feet?
The standard main door (front door) size in feet is 3 feet wide by 6 feet 8 inches tall. This is the 36-inch by 80-inch door slab discussed above. In some homes, you will find a 3-foot by 7-foot (36″ x 84″) door, but 6 feet 8 inches is the overwhelming standard.
How do I measure a doorway for a new door?
For a slab door replacement, measure the width and height of the existing door slab, not the frame. Measure in three places and use the smallest dimension. For a pre-hung door, measure the rough opening—the distance between the wall studs on the left and right, and from the floor to the top of the header. Always check with the door manufacturer, as rough opening requirements can vary slightly.
What is the standard width for a double doorway?
The most common double doorway width is 72 inches (6 feet) total, comprised of two 36-inch doors. You will also find 60-inch (two 30-inch doors) and 64-inch (two 32-inch doors) configurations. The total rough opening for a 72-inch double door will be approximately 74 inches wide.
What are normal doorway dimensions for interior doors?
Normal interior door widths are 28, 30, and 32 inches. The height is almost universally 80 inches. A 32-inch door is the most common for main living areas and bedrooms in newer construction. Older homes often have 30-inch doors, which can feel narrow.
In short: Standard US doorway dimensions are 32 inches wide by 80 inches tall for interior doors and 36 inches wide by 80 inches tall for exterior doors. These are nominal slab sizes that require a larger rough opening for installation, and they vary for double doors, accessibility compliance, and metric regions. Accurate measurement of the slab, frame, and wall thickness is essential for a successful fit.
As a manufacturer of doors and windows, we routinely produce doors in all these standard sizes. We also handle custom projects where an opening is non-standard, such as a 34-inch door slab or an 84-inch height for a specific renovation. If you are working with unusual dimensions or need doors for a multi-unit project, we can adjust the profile structure and fittings to match your local building codes. For a quote on standard or custom-sized doors, contact our team directly. Get a Free Quote
