What Is the Standard Doorway Width?
Doorways are typically between 24 and 36 inches (610–914 mm) wide in the clear opening, with 32 inches (813 mm) being the most common for residential interior doors and 36 inches (914 mm) standard for exterior and commercial entrances. The width you need depends on the room’s function, local building codes, and whether the door must accommodate accessibility requirements or large furnishings.
Most single doors in modern homes fall into one of three sizes: 30, 32, or 36 inches of actual door slab width. The clear opening—the space you actually walk through—will be roughly 2 inches narrower once you account for the door frame and hinges. This distinction matters more than most buyers realize, especially when ordering replacement doors or planning new construction.
Doorway Width by Application: Residential vs. Commercial
Residential Standard Widths
Interior residential doorways in the United States and Canada typically use 32-inch doors for bedrooms and bathrooms, while closets often get 24- or 28-inch doors. Entry doors and doors leading to garages or patios are almost always 36 inches wide. These figures refer to the nominal door slab width, not the clear opening.
Homes built before the 1970s often have narrower doorways. A 30-inch door was common for bedrooms in mid-century construction, and some older homes have doors as narrow as 28 inches. If you are renovating an older property, measure the actual opening rather than assuming modern standards apply—you may need custom sizes or frame adjustments.
In the United Kingdom and Europe, the metric system prevails. Standard UK interior door widths are 762 mm (30 inches) and 838 mm (33 inches), with 686 mm (27 inches) sometimes found in older properties. New UK builds typically use 838 mm for main living areas. European standards vary by country, but 800 mm (31.5 inches) is a common interior door width in many mainland European countries.
Commercial and Public Building Widths
Commercial doorways are generally wider than residential ones for a simple reason: they must accommodate higher traffic volumes, equipment movement, and accessibility laws. A minimum clear width of 32 inches is the baseline for most commercial openings, but 36 inches is far more common.
The Americans with Disabilities Act (ADA) requires a minimum clear opening width of 32 inches for doors in public and commercial buildings. This measurement must be taken from the face of the door when it is open at 90 degrees to the stop on the latch side. In practice, this means the door slab itself needs to be at least 34 inches wide to achieve a 32-inch clear opening once hardware and frame protrusions are accounted for.
Healthcare facilities, schools, and other high-traffic buildings frequently use 36-inch or even 42-inch doors to allow gurneys, equipment, and large groups to pass through efficiently.
Doorway Width Comparison Table
| Door Width (Nominal) | Clear Opening (Approx.) | Typical Application | Code Notes |
|---|---|---|---|
| 24 inches (610 mm) | 22 inches (559 mm) | Closets, utility rooms, small bathrooms | Minimum for some accessibility routes in private residences |
| 28 inches (711 mm) | 26 inches (660 mm) | Older home secondary bedrooms | Below current accessibility thresholds |
| 30 inches (762 mm) | 28 inches (711 mm) | Older home bedrooms, small bathrooms | Common in pre-1970s construction |
| 32 inches (813 mm) | 30 inches (762 mm) | Standard modern interior bedroom, bathroom | Meets ADA minimum for commercial clear opening |
| 34 inches (864 mm) | 32 inches (813 mm) | Commercial offices, wider residential passages | Often specified for healthcare corridors |
| 36 inches (914 mm) | 34 inches (864 mm) | Exterior entrances, commercial storefronts, main living areas | ADA-compliant when installed correctly |
| 42 inches (1067 mm) | 40 inches (1016 mm) | Hospitals, schools, high-traffic commercial | Required for some patient room access routes |
The table above shows nominal door slab widths. When you order a “32-inch door,” you receive a slab that is 32 inches wide, but the actual passage width will be closer to 30 inches after installation. Always verify whether you are specifying the door slab size or the clear opening width.
How to Measure a Doorway Width
Measuring a doorway correctly prevents costly ordering errors. The process differs depending on whether you are measuring an existing framed opening or a rough opening in new construction.
Measuring an Existing Doorway
For a door that is already installed, measure the width of the door slab itself first. Remove the door from its hinges if possible for the most accurate reading, then measure from edge to edge across the widest point. If removal is impractical, measure from the inside edge of the left jamb to the inside edge of the right jamb—this gives you the clear opening, which is what matters for accessibility compliance.
Common mistakes include measuring across the trim or casing rather than the actual jambs, and measuring at floor level where carpet or flooring may reduce the opening. Take measurements at three heights: near the top, middle, and bottom of the opening. Use the narrowest reading as your working dimension.
Measuring a Rough Opening
For new construction, the rough opening is the framed gap in the wall before the door unit is installed. Door manufacturers publish rough opening requirements for each of their products, but a general rule is that the rough opening should be about 2 inches wider than the nominal door width. A 36-inch door requires a rough opening of approximately 38 inches wide to allow for shimming and leveling.
Door Width vs. Door Frame Width vs. Rough Opening
These three terms describe different measurements in the same assembly:
- Door slab width is the actual width of the door panel itself.
- Door frame width is the overall width of the door unit including the jambs—typically 2 to 3 inches wider than the slab.
- Rough opening width is the gap in the wall framing, which must be larger than the frame to permit installation adjustments.
Buyers frequently confuse these terms when ordering, which leads to doors that arrive too large or too small for their openings. Confirm your specification documents clearly state which dimension you are providing.
When to Consider Custom Doorway Widths
Standard sizes cover perhaps 90 percent of residential and commercial applications, but custom widths become necessary in several situations.
Renovating Older Buildings
Historic properties rarely conform to modern dimensional standards. Plaster walls, settling foundations, and non-standard framing mean off-the-shelf doors often do not fit. A custom door manufactured to the actual measured opening saves the cost and complexity of reframing a wall.
Accessibility Retrofits
Widening an existing doorway for wheelchair access often requires custom solutions. The door must achieve a 32-inch clear opening, but the surrounding wall structure may not permit a standard 36-inch door without significant structural work. A custom 34-inch door might achieve compliance while preserving more of the existing wall.
Unusual Architectural Conditions
Sloped floors, curved walls, and non-standard wall thicknesses all create openings that standard doors cannot fill. Custom manufacturing allows the door to match the actual opening geometry rather than forcing the opening to match the door.
Mobility Device Considerations
Standard 32-inch residential doors accommodate most wheelchairs, but not all. A standard adult wheelchair has a width of about 24 to 26 inches, leaving little clearance through a 30-inch clear opening. Bariatric wheelchairs can reach 30 inches wide, requiring at least a 36-inch door. Walkers typically need 28 to 30 inches of clearance. If you are planning for a specific mobility device, measure its width and add at least 4 inches of clearance for comfortable passage.
How to Choose the Right Doorway Width for Your Project
Selecting the correct doorway width involves balancing function, code compliance, and cost. Work through these decision criteria in order.
1. Identify the Governing Code Requirements
Check whether your project falls under residential or commercial building codes. The International Residential Code (IRC) generally does not mandate specific interior door widths for single-family homes, though accessibility provisions may apply to certain rooms. Commercial projects fall under the International Building Code (IBC) and must comply with ADA standards where applicable. Local amendments frequently override national baselines, so verify with your local building department before finalizing specifications.
2. Consider the Door’s Function
A closet door that opens twice a day does not need the same width as a main entrance used daily with groceries in hand. Match the door width to the traffic and the items that must pass through it. Entry doors should be 36 inches minimum. Main interior passages work well at 32 inches. Secondary rooms can use 30 inches without practical downside.
3. Plan for Future Needs
A 30-inch bathroom door may feel adequate today, but it becomes a problem if you or a family member later needs a walker or wheelchair. Widening a doorway after construction costs significantly more than specifying a wider door during the build. If there is any reasonable chance of mobility needs changing, install 36-inch doors in main living areas and bathrooms.
4. Evaluate the Cost Trade-Off
Wider doors cost more in materials and may require larger rough openings, which affects framing and structural headers. A 36-inch door carries a modest premium over a 32-inch door in most product lines, but the cost difference is small compared to retrofitting later. Custom widths add a more significant premium due to non-standard manufacturing runs.
Choose a 32-inch door for standard interior rooms if budget is a primary concern and accessibility is not an issue. Choose 36-inch doors for all main living areas and entrances if you want maximum flexibility for furniture moves, mobility equipment, and resale value.
Frequently Asked Questions About Doorway Widths
How wide are most doorways?
Most interior doorways in modern North American homes are 32 inches wide, while exterior doorways are typically 36 inches. Older homes frequently have 30-inch interior doors. In the UK and Europe, 30 to 33 inches (762–838 mm) is typical for interior doors.
How big are doorways in commercial buildings?
Commercial doorways generally range from 36 to 42 inches wide. The minimum clear opening for ADA compliance is 32 inches, but most commercial specifications call for 36 inches to accommodate higher traffic volumes and equipment movement.
What is the minimum doorway width for ADA compliance?
The ADA requires a minimum clear opening width of 32 inches for doors in public accommodations and commercial facilities. This clear opening is measured with the door open at 90 degrees, from the face of the door to the opposite stop. A door slab of at least 34 inches is typically needed to achieve this clear opening.
How do I measure a doorway width?
Measure the door slab from edge to edge for nominal width, or measure the clear opening from inside jamb to inside jamb. For rough openings, measure the framed gap in the wall. Take measurements at the top, middle, and bottom, and use the narrowest dimension.
What is the difference between doorway width and door frame width?
Doorway width usually refers to the clear opening or the door slab width, while frame width is the total width of the door unit including jambs. The frame width is typically 2 to 3 inches wider than the door slab. The rough opening must be wider still to allow for installation shimming.
Can I get a custom doorway width?
Yes. Custom door widths are widely available from manufacturers, though they cost more than standard sizes. Custom doors are the practical solution for older buildings, unusual architectural conditions, and accessibility retrofits where the existing opening cannot be easily modified.
Additional Considerations: Doorway Width and Accessibility
Doorway width interacts with several other factors that determine whether a space is truly accessible. Clear floor space on both sides of the door, the door’s swing direction, and the maneuvering clearance at the approach all affect usability as much as the opening width itself.
A 32-inch clear opening is of little use if the hallway leading to it is only 28 inches wide. ADA standards require a clear width of at least 36 inches for accessible routes, and the approach to a door must include adequate maneuvering space—typically 60 inches of clear depth on the pull side of the door.
Door hardware also affects effective width. Lever handles are easier to operate than round knobs for people with limited hand strength, and they do not protrude as far into the opening. Automatic door openers can reduce the required clear width in some commercial applications because they eliminate the need for a person to pull the door while maneuvering a wheelchair.
For residential projects, homeowners are not legally required to meet ADA standards unless local codes say otherwise. However, applying ADA principles as design guidelines produces homes that are more livable for people of all ages and abilities. The cost difference between a 32-inch and a 36-inch door is modest; the cost of widening a doorway after the fact is substantial.
How Manufacturers Handle Non-Standard Doorway Widths
As a door and window manufacturer, we see the full spectrum of doorway width requirements across residential, commercial, and institutional projects. Our approach to non-standard widths is straightforward: we manufacture doors to the exact opening dimensions our clients provide, rather than asking them to adapt their construction to fixed sizes.
This capability matters most in three situations. First, renovation projects in older buildings where the existing framing cannot be economically modified. Second, commercial projects where local accessibility codes demand clear openings that standard door sizes do not achieve without custom frame detailing. Third, export projects where the destination country’s dimensional standards differ from those in our home market.
Our manufacturing process supports full customization of door width, height, and configuration. We produce solid wood doors, thermal-break aluminum doors and windows, and system windows in custom dimensions, with adjustable profile structures and fittings to match local building codes in your target market. Whether your project requires a 30-inch interior door for a historic renovation or a 42-inch commercial entrance, we can match the specification precisely.
Every door we ship undergoes pre-shipment inspection for air-tightness, water-tightness, and wind resistance, regardless of whether it is a standard size or a custom fabrication. We provide full export documentation, including packing lists, proforma invoices, and customs paperwork, and we ship via both FCL and LCL from our factory in China. For buyers who need to match specific local building codes, our engineering team can adjust profile structures and fittings to meet the relevant standards.
If your project involves non-standard doorway widths or you need guidance on which door size fits your application, contact us with your opening measurements and code requirements. We can advise on the optimal door specification and provide a quote tailored to your exact dimensions.
