What Are Standard Exterior Door Sizes?
The standard exterior door size in North America is 36 inches wide by 80 inches tall (36″ x 80″). This dimension refers to the actual door slab, not the rough opening in the wall. Most residential entry doors fall into a range of 30 to 36 inches in width and 80 to 96 inches in height, with 36″ x 80″ being the most common size for front entry doors.
For clarity, “standard” means a size that manufacturers produce in high volume without custom tooling or special orders. These sizes are widely available through distributors, lumberyards, and factory-direct suppliers. Understanding the difference between the door slab size, the frame size, and the rough opening is essential before ordering any replacement or new construction door.
Standard Exterior Door Dimensions
The table below shows typical exterior door slab sizes in both imperial and metric units, along with the corresponding rough opening dimensions. Note that rough openings vary by manufacturer and frame type, so treat these as starting points rather than absolute values.
| Door Width (in) | Door Height (in) | Metric Width (mm) | Metric Height (mm) | Typical Rough Opening (W x H, in) |
|---|---|---|---|---|
| 30 | 80 | 762 | 2032 | 32 x 82 |
| 32 | 80 | 813 | 2032 | 34 x 82 |
| 34 | 80 | 864 | 2032 | 36 x 82 |
| 36 | 80 | 914 | 2032 | 38 x 82 |
| 36 | 84 | 914 | 2134 | 38 x 86 |
| 36 | 96 | 914 | 2438 | 38 x 98 |
| 42 | 96 | 1067 | 2438 | 44 x 98 |
| 48 | 96 | 1219 | 2438 | 50 x 98 |
The 36-inch width is the most common for front entry doors because it comfortably accommodates furniture moving and meets accessibility guidelines for wheelchair passage in most cases. Side-by-side double doors typically use two 36-inch slabs, producing a combined 72-inch opening, though some configurations use 30-inch or 32-inch slabs for a narrower total width.
Nominal vs. actual size matters here. A door labeled 36″ x 80″ typically measures slightly less—often 35-7/8″ x 79-1/4″—to allow clearance within the frame. This is not a defect; it is intentional. When measuring an existing door, always measure the slab itself, not the frame or the opening, to avoid ordering the wrong size.
How to Measure Your Exterior Door Opening
Accurate measurement prevents costly ordering errors. Follow these steps for a replacement door:
- Measure the door slab width. Remove any interior trim or measure the door itself from edge to edge at three points: top, middle, and bottom. Use the smallest measurement.
- Measure the door slab height. Measure from the top edge to the bottom edge at the left, center, and right. Again, use the smallest.
- Measure the door thickness. Standard exterior door thickness is 1-3/4 inches, but confirm this, especially for heavier doors or custom builds.
- Measure the rough opening. This is the framed opening in the wall, measured from stud to stud and from the floor to the header. The rough opening is typically 2 inches wider and 2 inches taller than the door slab.
- Check the jamb depth. The jamb must match the thickness of your wall, including siding and drywall. Standard jamb depths range from 4-9/16 inches for 2×4 framing to 6-9/16 inches for 2×6 framing, but exterior walls with added insulation or sheathing can require deeper jambs.
Existing framing irregularities are common, especially in older homes. Walls may not be perfectly square or plumb, so measuring at multiple points reveals discrepancies. If the opening is off by more than 1/4 inch, a custom-sized door or frame adjustment may be necessary. Also, account for thresholds and weatherstripping—these affect the rough opening height more than the door slab size, and failing to consider them leads to ordering a door that fits the slab but not the assembly.
When to Consider Custom Sizes
Standard sizes cover the majority of residential applications, but several situations call for custom dimensions:
- Older homes and masonry walls. Pre-1950s construction often used non-standard framing. Masonry walls—brick, block, or stone—cannot be easily enlarged or reduced, so a custom door is frequently the only practical solution.
- 10-foot exterior doors. A 10-foot door (120 inches tall) is a specialty size used for grand entryways, commercial storefronts, and luxury residential projects. These doors require custom engineering because the increased height affects hinge placement, structural rigidity, and wind load resistance. A 10-foot door is not a standard stock item; it requires a manufacturer capable of producing taller slabs with reinforced framing.
- Accessibility requirements. While a 36-inch door generally satisfies wheelchair clearance, some accessibility standards require a minimum clear opening of 32 inches when the door is open at 90 degrees. This can necessitate a wider door or offset hinges.
- Architectural style. Mid-century modern homes often use 8-foot doors, while contemporary designs frequently specify 9-foot or 10-foot doors to create a sense of scale. These are increasingly available as semi-custom options.
The trade-off between standard and custom sizes comes down to cost and lead time. Standard doors are manufactured in volume, so they are less expensive and ship quickly—often within days. Custom doors require dedicated production runs, special materials, and additional engineering, which increases both price and lead time. For a 10-foot door, expect a significantly longer manufacturing cycle and a higher price point than a comparable standard-height door. Buyers should weigh the aesthetic or functional benefit against these practical constraints.
Building Codes and Accessibility Considerations
Building codes affect exterior door sizes in two ways: egress requirements and accessibility standards. There is no single universal code; requirements vary by jurisdiction, so always verify local codes before ordering.
The International Residential Code (IRC), which many U.S. jurisdictions adopt, requires at least one exterior door that provides a clear opening of at least 32 inches wide and 78 inches high. This clear opening is measured with the door open at 90 degrees, so the actual door slab must be wider than 32 inches—typically 34 or 36 inches—to account for the thickness of the door and hardware.
The Americans with Disabilities Act (ADA) and its state-level counterparts apply to commercial buildings and some multifamily residential projects. ADA standards require a minimum clear width of 32 inches, which again translates to a 36-inch door slab in most configurations. For public buildings, doors must also have maneuvering clearance on both sides, which affects door location and swing direction.
Threshold height is another code consideration. Many codes limit threshold height to 3/4 inch for residential doors to reduce trip hazards, with a maximum of 1/2 inch for accessible routes. This affects the rough opening height calculation and can influence whether a standard 80-inch door provides sufficient clearance.
Frequently Asked Questions About Exterior Door Sizes
What is the standard width of an exterior door?
The standard width is 36 inches for front entry doors. Back doors and side doors commonly use 32-inch or 34-inch widths. The 36-inch width is preferred for main entrances because it provides comfortable passage and meets accessibility guidelines.
What is the rough opening for a 36-inch door?
The typical rough opening for a 36-inch door is 38 inches wide by 82 inches tall for an 80-inch door. This 2-inch allowance on each dimension accommodates the frame, shims, and leveling adjustments. Rough openings vary by manufacturer and frame type, so confirm with your supplier.
What is the difference between pre-hung and slab doors?
A pre-hung door comes with the frame, hinges, and often the threshold pre-assembled. It installs as a complete unit into the rough opening. A slab door is just the door panel, which requires installing into an existing frame. Pre-hung doors are easier to install and ensure proper alignment, while slabs are more suitable for replacing a door in an existing, sound frame.
Can I get a custom-sized exterior door?
Yes. Manufacturers offer custom widths, heights, and configurations. Custom sizes are necessary for non-standard openings, historical renovations, or architectural designs that specify unusual proportions. Expect higher costs and longer lead times compared to standard sizes.
What is a 10 ft exterior door and when is it used?
A 10-foot exterior door is 120 inches tall, used in luxury residential and commercial applications to create dramatic entryways or accommodate large openings. These doors require custom engineering for structural support and wind load resistance. They are not stock items and must be manufactured to order.
Related Considerations for Buyers
When selecting an exterior door size, consider the relationship between the door and the surrounding wall. A 36-inch door in an 8-foot-wide opening leaves only 2 feet of wall on each side, which can look disproportionate. Conversely, a 36-inch door in a 12-foot opening may appear lost. The door should occupy roughly one-third to one-half of the total wall width for balanced proportions.
Double doors are an option for wider openings. Standard configurations use two 30-inch or 32-inch slabs, producing total widths of 60 to 64 inches. French doors, which are a type of double door with glass panels, follow the same sizing logic. For a 72-inch opening, two 36-inch slabs are common, though this creates a very wide entry that requires careful consideration of swing direction and hardware.
The difference between front and back doors is primarily width. Front doors are typically 36 inches wide, while back and side doors are often 32 inches. This is not a code requirement but a practical convention—front doors need to accommodate furniture and guests, while back doors serve more utilitarian purposes.
For buyers sourcing doors for construction projects, standard sizes reduce cost and lead time. Custom sizes extend both. When planning a project, determine whether the architectural design can accommodate standard sizes before committing to custom dimensions. In many cases, adjusting the rough opening by a few inches is far less expensive than ordering a custom door.
As a manufacturer of exterior doors, we see these sizing decisions daily. Our approach is to help buyers match the right size to the opening and the application, whether that means a standard 36″ x 80″ door for a typical residential entry or a custom 10-foot door for a commercial storefront. We offer full customization on size, and our factory-direct model allows us to produce non-standard dimensions without the markup of a middleman. Every door undergoes pre-shipment inspection for air-tightness, water-tightness, and wind resistance, and we adjust profile structures and fittings to match local building codes in your market.
If you are planning a project and need clarity on door sizing, rough openings, or custom options, our team can help you specify the right product. Contact us to discuss your requirements and get a quote based on your specific dimensions and performance needs.
