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Interior door size guide

Interior door size guide

For interior door purchase, people consider various factors like the associated style, a pre-hung door, or simply a slab of in- or out-swing type. Take accurate measurements to make the right selection.

What is the Standard Interior Door Size?

The standard width of the door varies based on the styles and sizes available. The common door width is 36, 30, and 32 inches. The measurement includes just the panel and not the surrounding frame.

The door height is the standard dimension and the passageways to the rooms commonly have 80-inch height. The aim is to have adequate space for most people to pass through the doorway without their head bumping.

The utility and closet doors are shorter at 78-inch height. Traditionally, the interior door is often between 24-36 inches with the most common being 32 inches with an 80-inch height.

People can clear this size doorway without brushing the sides of the frame. Make the doors of minimum 36-inch width to make the interiors accessible to wheelchair users.

Standard Interior Door Thickness

Common thickness is one and three-eighth inches with the other options being 1.5. one and five-eighth, and one and three-fourth inches. Especially large or oversized varieties with a height over 90 inches or a width of over 36 inches tend to be thicker than the standard door sizes.

When ordering the hardware like the hinges and doorknobs measuring the door thickness is most important. Even the fire doors are thicker than the traditional doors for your interiors.

How to Measure a Door

In any new construction, the doors are a final addition but you do not want to wait for the end to make selections. Instead, establish the size you desire at the framing stage. The erection of studs forms rough openings in-between rooms.

These should be quite strong to support the frame and door. Ideally, the rough openings should have two inches more width than the interior door installed. This way, there is adequate room for door frames with small gaps on both door sides. You can open and close this easily.

When it comes to the related height, this rough opening should be 2.5 inches tall at least. With very thick flooring, you need the opening to be taller to ensure free swinging of the door.

After getting through the rough opening, the subsequent step is adding the door frame and hanging the door. You can even install the pre-hung door. Ordering the interior door is often the final stage so you should measure the size of the actual opening and not the plan measurements. Calculation of the appropriate replacement door size, involves the doorway measurement.

This refers to the opening for hanging the door instead of the current door. The wood related to the frame or the door changes shape or becomes warped due to the weather conditions. It is important to establish the thickness of replacement doors too.

Door Width and Height

Measure the door width for ordering, stand before the door in a way that it opens away and open it, even prop open when necessary to keep the hinges from pinching the fingers.

Place one part of the tape measure on the inside of the frame, extend this through the opening to the other part of the frame. Make sure that the tape remains parallel to the floor. There should be three measurements,

●      One at the top

●      The bottom part

●      Roughly the middle

Consider the widest measurement of the three to order the new door. Next measure from the doorway height and here too, stand before the door, opening this in the opposite direction.

Use tape for measuring perpendicularly to flooring, running this along with the door jamb’s interior edges. Both the measurements must be the same because mismatch signifies problems with the underlying structure.

Door Thickness

Measure the thickness of the existing door and for this run the tap along door edges in multiple places, recording each measurement. Do this right to reuse the doorknob and hinges. The design of the pieces depends on the door thickness.

Interior Door Sizes

There is a uniform accessibility and safety standard for townhouses and family dwellings. Home inspectors refer to this to sign off the new home but there is no regulation or requirement for interior doors.

Just ensure that these work well and the installation is as per the specifications of the manufacturer.

●      Bedroom door: the standard is 32-inch width and 80-inch height with one and three-eighth inch typical thickness. 

●      Double-door: this is often 60, 64, or 72 inches but there is no thickness standard. A tall and wide door should be thick to support the weight.

●      Bathroom door: the size consideration for this is the same as others with 24-36 inches width and 80-inch height. The design and thickness of the door complements the frame.

●      Closet door: there are no regulations in place to standardize the closet doors with the only limitation relating to size of rough openings. This often has an eighty-inch height and thirty-inch width.

●      French door: this type of interior door contains a light or thin frame surrounding the glass panes and it forms most of the surface area of the door. Mostly in pairs, the thickness and size of both doors should be the same and there is no standard size for this type. It can be anything between 30 to 72 inches, in the increments of two.

Making decisions regarding this door is difficult because changing it later to a smaller or larger size is both time consuming, complex, and sometimes even impossible. The design and style of all such doors should be the same.

With non-standard doors, you want to pick a door with all possible sizes. The least expensive types are available in the common sizes so they work well for most rooms in the house.


The interior door can be as simple or gorgeous as you choose with new door installation, an upgrade or replacement.

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