What Is the Standard Interior Door Width?
A standard interior door is 32 inches wide and 80 inches (6’8″) tall. That 32-inch width is the most common size for bedroom and living area doors in homes built after the 1980s. In practice, interior doors range from 28 to 36 inches wide, with 30-inch and 36-inch options also widely stocked by manufacturers and lumberyards.
The “standard” is not a legal requirement for most residential rooms—it is a production convention. Door manufacturers make slabs and prehung units in fixed widths so that builders, renovators, and homeowners can order replacements without custom milling. If you are asking how wide interior doors are in typical homes, the answer depends on when the house was built and where it is located, but 32 inches is the safe default for a new door.
Door widths are expressed in two ways: the nominal size (what you order, such as “2’8″”) and the actual size (the physical slab dimension). For a 2’8″ door, the actual slab is typically 31.875 inches wide—a 1/8-inch allowance that prevents binding against the frame. This distinction matters when you measure an existing door and compare it to catalog listings.
Common Interior Door Widths Explained
Interior doors are manufactured in four standard widths: 28, 30, 32, and 36 inches. Each width serves a different purpose, and knowing the difference prevents ordering errors.
28-Inch Doors
A 28-inch (2’4″) door is the narrowest common interior door. It appears in older homes, closets, and utility rooms where traffic is light and furniture does not need to pass through. The actual slab measures 27.875 inches. This width is rarely specified in new construction except for small storage spaces.
30-Inch Doors
The 30-inch (2’6″) door is a common choice for bathrooms and secondary bedrooms. It provides a reasonable opening for one person while conserving floor space in tight layouts. Actual slab width is 29.875 inches. In many markets, 30-inch is the minimum width considered comfortable for a bathroom.
32-Inch Doors
The 32-inch (2’8″) door is the most common interior door width in modern residential construction. It is wide enough for most furniture and comfortable passage, and it fits the standard 34-inch rough opening that builders frame. Actual slab width is 31.875 inches. If you are replacing a door in a home built in the last 40 years, this is likely the size you need.
36-Inch Doors
A 36-inch (3’0″) door is used where accessibility or large items matter. It is the minimum width required for wheelchair passage under the Americans with Disabilities Act (ADA) guidelines, and it is common in main living areas, home offices, and primary suites. Actual slab width is 35.875 inches. The trade-off is floor space: a 36-inch door swings through a larger arc and requires a wider rough opening (38 inches).
Widths Outside the Standard Range
Doors narrower than 28 inches or wider than 36 inches are available but are not “standard” in the sense of being stocked inventory. Manufacturers produce custom widths for renovations, historic homes, and commercial projects, but expect longer lead times and higher per-unit costs. If your opening is an odd size, it is almost always cheaper to adjust the framing to accept a standard door than to order a custom slab.
Interior Door Width Comparison Table
The table below summarizes the standard interior door widths, their nominal designations, actual slab dimensions, and typical rough opening widths. Use it as a quick reference when measuring or ordering.
| Nominal Size | Door Width (inches) | Actual Slab Width | Typical Rough Opening | Common Use |
|---|---|---|---|---|
| 2’0″ | 24 | 23.875 | 26 | Closets, utility |
| 2’4″ | 28 | 27.875 | 30 | Closets, older homes |
| 2’6″ | 30 | 29.875 | 32 | Bathrooms, secondary bedrooms |
| 2’8″ | 32 | 31.875 | 34 | Bedrooms, living areas (most common) |
| 2’10” | 34 | 33.875 | 36 | Passage areas, some commercial |
| 3’0″ | 36 | 35.875 | 38 | Accessibility, main entrances within a home |
Note that the actual slab width is consistently 1/8 inch less than the nominal width. This clearance allows the door to swing freely without rubbing the jamb. The rough opening is the framed hole in the wall, which is typically 2 inches wider than the door slab to accommodate the jamb and shims.
How to Choose the Right Door Width
Choosing a door width is a balance between accessibility, furniture movement, and available floor space. There is no single correct answer, but the following criteria will guide the decision.
Match the Room’s Function
A bathroom door does not need to accommodate a sofa, so 30 inches is usually sufficient. A bedroom door should be at least 32 inches to allow dressers and bed frames to pass. If the room is a primary suite or an office where a wheelchair user may need access, 36 inches is the appropriate choice. For closets, 28 inches is acceptable for reach-in storage, but walk-in closets benefit from 30-inch or wider openings.
Consider the Swing Direction and Wall Space
A door’s width directly affects its swing arc. A 36-inch door needs roughly 36 inches of clear wall space on the hinge side to open fully. In a narrow hallway or a small room, that space may not exist. Measure the available wall on both sides of the opening before committing to a wider door.
Account for Furniture and Appliances
If the door leads to a room that contains large items—a bedroom with a king bed, a laundry room with a front-load washer, or a home gym—measure the largest item that must pass through. A 32-inch door accommodates most furniture when the piece is turned diagonally, but a 36-inch door removes the guesswork. For moving grand pianos or large sectional sofas, consider whether the item will fit through the door at all, regardless of width.
Check Local Building Codes
Most residential building codes do not mandate interior door widths for standard rooms, but they do regulate bathrooms and accessibility. The IRC requires a minimum 24-inch clear opening for bathroom doors in some configurations, while ADA guidelines specify 32 inches of clear width for wheelchair passage. Commercial buildings and multi-family housing are subject to stricter requirements. Verify the applicable code before ordering.
Choose A if… Choose B if…
Choose a 30-inch door if you are replacing a bathroom or powder room door and space is tight. Choose a 32-inch door for standard bedrooms and most interior passageways—it is the best balance of cost, availability, and function. Choose a 36-inch door for primary suites, home offices, or any doorway that must be wheelchair accessible. Choose a 28-inch door only for closets or utility spaces where nothing larger than a person needs to pass.
Measuring Your Door Opening Correctly
Measuring a door opening correctly requires knowing whether you are measuring an existing door slab, an existing frame, or a rough opening in new construction. These three measurements are not interchangeable.
Measuring an Existing Door Slab
To measure a door slab that is already hung, remove the door from the hinges or measure it while it is open. Measure the width across the slab from left to right at the widest point, typically at the bottom or middle. Do not include the hinges or any weatherstripping. Measure the height from the bottom edge to the top edge. A standard 2’8″ slab will measure approximately 31.875 inches wide and 79.5 inches tall (the height is 1/2 inch less than the nominal 80 inches to clear the floor).
Measuring an Existing Frame (Prehung Replacement)
If you are replacing the entire door and frame, measure the rough opening instead. The rough opening is the distance between the wall studs, measured from the inside edge of one stud to the inside edge of the other. It should be about 2 inches wider than the door slab. For a 32-inch door, the rough opening is 34 inches wide and 82.5 inches tall (to accommodate the 80-inch door plus the frame and clearance). Measure at the top, middle, and bottom; if the opening is out of square, use the narrowest measurement.
Measuring for New Construction
In new construction, frame the rough opening before ordering the door. The rule of thumb is to add 2 inches to the door width and 2.5 inches to the door height. For a 30-inch door, frame a 32-inch by 82.5-inch opening. For a 36-inch door, frame a 38-inch by 82.5-inch opening. If you are using prehung doors, order the door after the framing is complete, then measure the actual opening to confirm the size.
Common Measuring Mistakes
The most frequent error is measuring the door slab but ordering a prehung unit, or vice versa. Another common mistake is measuring from the outside of the trim rather than the inside of the frame. Trim adds 1 to 2 inches on each side, which will lead you to order a door that is too wide. Finally, do not assume the opening is square—measure at multiple points and use the smallest width and height to ensure the door fits without planing.
Additional Considerations for Interior Door Sizes
Beyond the basic width, several factors affect how a door fits and functions. Buyers who ignore these details often end up with a door that does not fit the frame or fails to meet accessibility requirements.
Rough Opening vs. Door Slab Width
The rough opening and the door slab width are related but distinct measurements. The rough opening is the framed gap in the wall, and it is always larger than the door itself. The difference accounts for the door jamb (the frame pieces on either side), the shims used to plumb the frame, and the 1/8-inch clearance around the slab. Ordering a door based on the rough opening measurement alone will result in a slab that is far too large.
Interior Door Width by Room Type
The table below summarizes the recommended door width for each room type in a typical home.
| Room Type | Recommended Width | Notes |
|---|---|---|
| Closet | 24–28 inches | Reach-in closets; 28 for walk-in |
| Bathroom | 30 inches | 32 if space allows or for accessibility |
| Secondary bedroom | 30–32 inches | 32 is the modern standard |
| Primary bedroom | 32–36 inches | 36 for accessibility or large furniture |
| Living room / common area | 32–36 inches | Match the largest adjacent door |
| Home office | 32 inches | 36 if the room serves as a guest room |
| Laundry / utility | 30–32 inches | Wide enough for appliance service |
Metric Equivalents for International Buyers
If you are sourcing doors from a manufacturer that uses metric dimensions, the conversion is straightforward: multiply inches by 25.4 to get millimeters. A 32-inch door is 813 mm, a 30-inch door is 762 mm, and a 36-inch door is 914 mm. European and Asian manufacturers often produce doors in metric widths such as 700 mm, 800 mm, and 900 mm, which are close to but not identical to US standard sizes. If you are importing doors, confirm whether the manufacturer is producing to US nominal sizes or metric standards—a 800 mm door is 31.5 inches, which will not fit a US 32-inch rough opening without modification.
How Wide Is a Standard Interior Door Compared to Exterior Doors?
Exterior doors are consistently wider than interior doors. A standard exterior door is 36 inches wide and 80 inches tall, matching the widest common interior door. However, exterior doors are built to different specifications: they are thicker (typically 1.75 inches vs. 1.375 inches for interior doors), use heavier hardware, and include weatherstripping and thresholds. If you are planning a doorway that connects an interior space to an exterior patio or deck, you must specify an exterior-rated door even if the width matches an interior standard.
Commercial Building Door Widths
Commercial buildings follow a different set of standards than residential homes. The ADA requires a minimum clear width of 32 inches for doorways, measured with the door open at 90 degrees. This means the door slab itself may be 34 or 36 inches wide to account for the frame and hardware. Fire-rated doors in commercial buildings often need to be 36 inches wide to meet egress requirements. If you are sourcing doors for a commercial project, confirm the occupancy classification and applicable fire code before ordering.
How Wide Is a Interior Door in Older Homes?
Homes built before 1950 often have narrower doors than modern construction. A common width in pre-war homes is 30 inches, and some very old homes have doors as narrow as 26 inches. These doors are not “standard” by current manufacturing conventions, so replacements typically require custom sizing or frame modification. If you are renovating an older home, measure all doors before assuming they are the same width—older homes frequently have inconsistent door sizes from room to room.
Custom Door Width Options
Custom-width doors are available from most manufacturers, including us, for openings that do not match standard sizes. The cost premium depends on the width deviation: a door that is 33 inches wide (1 inch over standard) requires a custom slab and possibly custom jambs, which increases cost and lead time. Before ordering a custom door, measure the opening carefully and consider whether adjusting the framing to accept a standard 34-inch rough opening is more economical. For most projects, modifying the wall is cheaper than a fully custom door.
How We Meet These Standards as a Manufacturer
As a door and window manufacturer, we produce interior doors to the standard widths and heights discussed above: 28, 30, 32, and 36 inches in width, with 80-inch and 96-inch heights available. Our factory in China supplies directly to builders, contractors, and distributors, which means you are ordering from the production line rather than through a middleman. The pricing reflects that direct relationship.
We also handle the details that matter for a successful order. Every door is inspected before shipment—we test for dimensional accuracy against the nominal sizes listed in this guide, and we verify that the slab width matches the specification within the standard 1/8-inch tolerance. For international buyers, we provide full export documentation, including packing lists and proforma invoices, and we ship both FCL and LCL depending on your order volume.
Custom sizing is available for projects that fall outside standard dimensions. If your rough opening is an odd size, we can adjust the door width to match, and we can also modify the profile structure and fittings to align with local building codes in your target market. This is particularly useful for renovation projects in older buildings where standard dimensions do not apply.
When you are ready to order, send us your rough opening measurements or your existing door dimensions. We will confirm which standard width fits your project or advise on a custom size if needed.
