What Is the Standard Height of an Interior Door?
A standard interior door in the United States is 80 inches (6 feet 8 inches) tall. This is the most common height for residential interior doors, and it is sometimes referred to as a “6/8” door in architectural shorthand. If you are replacing a door in a home built after the 1950s, the 80-inch height is what you will almost certainly encounter.
There is a second, less common standard height: 96 inches (8 feet). These taller doors, called “8/0” doors, are found in homes with higher ceilings (9-foot or more) and in some commercial or luxury residential settings. They are used to create a more dramatic visual scale and to better match tall entryways.
When someone asks “how tall is an interior door?”, the practical answer is 80 inches for standard residential applications. The 96-inch option exists, but it is not the default. If you are measuring an existing door, the actual slab height may be slightly less than 80 inches (typically 79.5 or 79.875 inches) to allow clearance for the floor covering and the frame. The nominal size is 80 inches; the actual size is cut to fit the opening.
Standard Interior Door Widths and Thickness: A Quick Reference Table
Interior door widths follow a defined set of standard sizes, measured in 2-inch increments. These widths are nominal—the actual door slab is about 1/8 to 1/4 inch smaller to fit within the frame.
| Dimension | Standard Sizes (inches) | Typical Application |
|---|---|---|
| Height | 80 (6/8), 96 (8/0) | 80 for standard residential; 96 for tall ceilings and commercial |
| Width | 24, 28, 30, 32, 36 | 24–28 for closets and utility; 30–32 for bedrooms and baths; 36 for main living areas and accessibility |
| Thickness (interior) | 1 3/8 | Standard hollow-core and solid-core interior doors |
| Thickness (exterior) | 1 3/4 | Entry doors and doors requiring higher insulation or security |
Width guidance by room:
- 24 inches and 28 inches: Closets, small utility rooms, and mechanical spaces. These are rarely used for rooms people occupy regularly.
- 30 inches: Older homes and some bathrooms. It is the minimum comfortable width for a passage door in tight spaces.
- 32 inches: The most common width for bedrooms and bathrooms in modern construction. It balances passage comfort with wall space.
- 36 inches: Used for main living areas, family rooms, and primary suites. It is also the required width for doors that must comply with accessibility guidelines (ADA), which mandate a minimum 32-inch clear opening—a 36-inch door typically achieves this once the frame and hardware are accounted for.
Thickness considerations: The 1 3/8-inch thickness is standard for interior doors because they do not need to resist weather or provide significant security. The heavier 1 3/4-inch thickness is reserved for exterior doors, which require more material for insulation, structural rigidity, and lock reinforcement. If you are installing a solid-core interior door for soundproofing, it will still typically be 1 3/8 inches thick; the added mass comes from the core material, not the overall thickness.
How to Measure Your Interior Door Correctly
Measuring an existing interior door for replacement requires three measurements: height, width, and thickness. Each must be taken from the door slab itself, not the frame.
To measure height: Measure from the top edge of the door to the bottom edge. Do not include any weatherstripping or sweep attached to the bottom. Measure at the left edge, center, and right edge; use the largest measurement as your reference. Doors are not always perfectly square, and the largest dimension is what you need for a new slab to fit.
To measure width: Measure across the door from left edge to right edge at the top, middle, and bottom. Use the widest measurement. Standard widths are 24, 28, 30, 32, or 36 inches, but an existing door may be non-standard if the house is older or custom-built. If your measurement falls between standard sizes, you will need a custom slab or a new frame.
To measure thickness: Measure the edge of the door—the narrow side—at the hinge edge or the latch edge. Interior doors are almost always 1 3/8 inches thick. If you measure 1 3/4 inches, the door may actually be an exterior door used in an interior opening, or you may be looking at a specialty acoustic door.
Critical distinction: If you are ordering a pre-hung door (a slab already mounted in a frame), you measure the outside of the frame, not the slab. A pre-hung unit for a 32-inch door measures roughly 34 inches wide and 82 inches tall, because the frame adds width and height around the slab. If you are ordering only a slab door to fit an existing frame, measure the slab itself as described above. Mixing these two measurement methods is the most common source of ordering errors.
When to Choose Custom Height Interior Doors
Custom height interior doors are warranted in several specific situations. The most common is when you have ceilings higher than 8 feet and want doors that extend closer to the ceiling line. A standard 80-inch door in a room with 10-foot ceilings can look stunted; a 96-inch door, or a door cut to a custom height between 80 and 96 inches, visually connects the door to the architectural scale of the room.
You also need custom heights when:
- The rough opening (the framed gap in the wall) is taller than standard due to older construction methods or settling.
- You are matching existing non-standard doors in a renovation, and you want the new door to align with the others.
- The floor height has changed, such as adding thicker subflooring or radiant heating, which reduces the effective opening height.
For commercial projects, door heights often follow different rules. While 80 inches is still common, many commercial interiors use 84-inch (7/0) doors, particularly in office and institutional settings. Some retail and hospitality projects use 96-inch doors to create a more open feel. Height is frequently dictated by fire codes and accessibility standards that specify clear opening dimensions, not just nominal door size.
If you are working on a project where ceiling height exceeds 9 feet, plan for custom-height doors early. Standard 96-inch door slabs are available, but heights between 80 and 96 inches are typically made to order. Lead times and costs increase accordingly, so factor that into your schedule.
Interior Door Frame Dimensions and Rough Openings
The rough opening is the framed hole in the wall into which the door unit is installed. For a standard 32-inch by 80-inch door, the rough opening should be approximately 34 inches wide by 82.5 inches high. For a 36-inch door, the rough opening is approximately 38 inches wide by 82.5 inches high.
The added width accounts for the door frame (the jambs) on both sides, typically 3/4 inch each, plus shim space for leveling and plumbing the unit. The added height accounts for the frame header and clearance for the floor.
The interior door frame itself—the jambs that the door closes against—is normally made from 4 9/16-inch wide lumber, which matches the thickness of a standard 2×4 wall with 1/2-inch drywall on each side. If your walls are thicker (such as 2×6 construction or walls with additional soundproofing layers), the frame width must be adjusted accordingly.
Interior vs. exterior door frames: Exterior door frames are wider to accommodate the thicker exterior door slab and typically include weatherstripping and a threshold. Interior frames do not need these elements, so the frame dimensions are simpler. When ordering, specify whether you need a slab only or a pre-hung unit with the correct jamb width for your wall assembly.
Common Questions About Interior Door Sizes
How tall is a standard interior door in the US?
80 inches (6 feet 8 inches). This is the nominal height for virtually all residential interior doors. In commercial construction, 84-inch and 96-inch doors are also used, but 80 inches remains the baseline.
What is the width of a standard interior door?
The most common widths are 30, 32, and 36 inches. The 32-inch door is the standard for bedrooms and bathrooms in newer construction. The 36-inch door is used for main living areas and is required for ADA-compliant accessible routes.
What is the standard thickness of an interior door?
1 3/8 inches. This applies to both hollow-core and solid-core interior doors. Exterior doors are thicker at 1 3/4 inches, but interior doors do not require the extra material.
How do I measure an interior door for replacement?
Measure the door slab itself—not the frame—at three points for height and width, and once on the edge for thickness. Use the largest measurements. If ordering a pre-hung unit, measure the outside dimensions of the existing frame instead.
What is the rough opening size for a standard interior door?
For a 32-inch door, the rough opening is about 34 inches wide by 82.5 inches high. For a 36-inch door, it is about 38 inches wide by 82.5 inches high. These dimensions allow for the frame and shim space.
Can I get custom height interior doors?
Yes. Custom heights between 80 and 96 inches are readily available from manufacturers. They are common in homes with ceilings above 8 feet and in commercial spaces designed for a taller visual scale. Expect longer lead times and higher cost compared to stock sizes.
Terms buyers should know
| Term | What it means | Why it matters when buying |
|---|---|---|
| Nominal size | The labeled dimension (e.g., 32″ x 80″) before manufacturing tolerances are applied | The actual slab is slightly smaller than the nominal size to fit the frame. Order by nominal size, not by measuring the gap. |
| Rough opening | The framed gap in the wall where the door unit installs | If your rough opening is too small, the door will not fit. Standard doors need roughly 2 inches of extra width and 2.5 inches of extra height over the nominal door size. |
| Pre-hung door | A door slab already mounted in a frame, ready to install as one unit | The overall unit dimensions are larger than the door slab. Measure the outside of the frame if you are replacing a pre-hung unit. |
| Slab door | The door panel only, without the frame or hinges | You order a slab when the existing frame is in good condition. You must measure the slab precisely; the frame cannot be adjusted to fit a mismatched slab. |
In short: a standard interior door in the United States is 80 inches tall, ranges from 24 to 36 inches in width depending on the room, and is 1 3/8 inches thick. These nominal dimensions apply to residential construction, while commercial projects may use 84-inch or 96-inch heights. Measuring the slab itself—not the frame—is the correct method for ordering a replacement, and rough openings must be roughly 2 inches wider and 2.5 inches taller than the nominal door size to accommodate the frame and shims.
How We Meet Your Interior Door Size Requirements
As a manufacturer of interior doors and windows, we work with standard dimensions every day, but we also understand that not every opening conforms to the typical 80-inch height and 32-inch width. When a project calls for custom height doors—whether that means 84-inch doors for a commercial renovation or 96-inch doors for a residential great room—we handle it at the factory level without passing the work through a middleman.
Our production approach is straightforward: we manufacture doors to your specified dimensions, not just to catalog sizes. If your rough opening is an unusual width, or your wall assembly requires a non-standard jamb width, we adjust the door slab and frame construction to match. The same applies to finish and hardware—if your project specifies a particular wood species, glass insert, or hinge placement, those are accommodated during manufacturing rather than treated as post-production modifications.
For buyers sourcing multiple units, we provide the documentation needed for international transactions, including packing lists, proforma invoices, and customs paperwork. We also test our products for air-tightness, water-tightness, and wind resistance before shipment, so you receive units that meet the performance requirements of your market. If your project must comply with local building codes, our profile structures and fittings can be adjusted to match those regulations.
If you are planning a project with non-standard door heights or widths, send us your opening measurements and we will confirm what is possible. Contact Our Team with your dimensions to discuss your requirements.
