Here’s our standard guide to sizing interior doors. Find out the most common sizes of bedroom, bathroom and closet doors.

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The height of the door is the standard size. All interior doors used as passageways between rooms should have a minimum height of 80 inches. (6’8) This allows the vast majority of people to use the passageway without bumping their heads.

Cabinet and laundry room doors that are not used to go from one room to another may be shorter. 78″ (6’6″) is a common height for closet doors.

What is the standard size of an interior door?

The standard widths of different types of interior doors can range from 24 to 36 inches. The most common width for interior doors is 32 inches. Thus, the standard size of an interior door is 32 inches wide and 80 inches high.

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Most people can get through a door of this size without touching the sides of the frame. If you want to make your home wheelchair accessible, each door should be at least 36 inches wide.

Standard Internal Thickness

The most common thickness for interior doors is 1⅜”. Other door thicknesses are available, such as 1½”, 1⅝” and 1¾”. Large or very large doors (more than 90 inches high or more than 36 inches wide) are generally thicker than standard-sized doors.

The thickness of the door becomes important when ordering hardware such as door handles and hinges. Fire doors are also thicker than regular interior doors.

To measure a door

Doors are one of the last touches to be added to new construction, but you can’t wait until the final stages of the project to think about them. The final size of the door is determined during the framing process.

Contractors install studs to create a “rough opening” between rooms and make them strong enough to support the door and door frame.

As a general rule, rough openings should be two inches wider than the door that will eventually be installed. This leaves room for the door frame and leaves a small gap on each side of the door for opening and closing.

In terms of height, the rough opening should be at least two and a half inches higher than the door. If the floor is very thick, the opening should be even higher so that the door can rotate freely.

Once you have a rough opening, the next step is to add a door frame and hang the door or install a pre-hung door.

Before proceeding to the final step of ordering a door, measure the dimensions of the actual rough opening – do not take the dimensions of the plan for granted.

To calculate the correct size of a replacement door, experts recommend measuring the opening (where the door will hang), not the existing door.

This is because the wood (in the door or in the door frame) may have warped or changed over time. You will also need to determine the desired thickness of the replacement door.

Width and height of door

To measure the width of a door you need to order, stand in front of the current door so that it opens away from you. Open the door and support it if necessary to prevent your fingers from getting between the hinges.

Place one end of the tape measure on the inside of the door frame and pull it through the doorway to the other side of the frame. The tape should run parallel to the floor.

Take three measurements – one at the very top, one at the very bottom, and one about halfway down. Whichever of these three measurements is the widest will be the first one you need to order a new door.

The next measurement needed is the height of the door. As with the width measurement, stand in front of the door and open the door away from you.

Hold the tape measure perpendicular to the floor and run it along each inner edge of the upright.

These two measures should be exactly equal. If they differ greatly, professional advice should be sought, as this may indicate an underlying structural problem.

Door Thickness

For the final measurement, the door thickness, you can use an existing door. Using a tape measure, measure in several places along the edge of the door and record the measurements.

This is especially important if you want to reuse door hinges or handles, as these fittings are designed to conform to the thickness of the door.

Inside dimensions door

The International Residential Code establishes uniform safety and affordability standards for detached homes and townhouses. This is what the home inspector refers to when he or she comes to sign your new home, in addition to any local ordinances.

Although the main entrance to the house must meet strict requirements, interior doors are not mandatory or adjustable. If they are present, they need only be in good condition and installed according to the manufacturer’s specifications.

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Standard size room door

There is no standard size for interior doors. Like other interior doors, they are generally 32 inches wide and 80 inches high. Typical thickness is 1 ⅜”.

Inside dimensions of the double door

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Double doors are two doors that hang side by side to create a double entrance or exit in a room or hallway. The most common widths for a pair of double doors are 60″, 64″ and 72″.

The standard door height of 80″ remains valid. There is no standard thickness for a double interior door.

The higher and wider the door is, the thicker it must be to support its own weight. Both doors must be the same width, height and thickness. Both doors open in the same direction.

Standard size French door

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A “French” door consists of a thin and light frame that surrounds the glass panes. The glass panes usually cover most of the surface of the door. They are often, but not always, hung in pairs.

If the doors are hung in pairs, both doors must be the same size and thickness. There is no standard size for a French door. The smallest French doors measure about 30 inches and can be found in increments of 2 inches to 72 inches.

Standard size cabinet door

The International Residential Code does not contain any regulations or standards for cabinet doors. The only limitation is the size of the rough opening. Cabinet doors are generally 30 inches wide by 80 inches wide.

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Many closets use sliding doors – these doors fold out of themselves instead of swinging across the room. As a general rule, each panel of a double folding door is 24 inches wide. For more information on cabinet door sizes, click here.

Standard size bathroom door

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The bathroom door must meet the same size requirements as any other interior door. It should be at least 80 inches high and 24-36 inches wide. The thickness and finish of the door should match the door frame.

Standard door size

An entrance door is an exterior door, i.e., it is used to connect the inside of the house to the outside. According to the International Residential Code, the main entrance of a house must be at least 80 inches high and 36 inches wide.

(Side or rear doors may be smaller; 28″, 30″ and 32″ are the most common widths for these doors).

Exterior doors have the added task of sealing your home from the elements and keeping the temperature inside. For this reason, they are usually slightly thicker than standard interior doors. The average thickness of a standard front door is 1¾.

Internal aspects of door size

It is difficult to make decisions about interior doors because you have to live with the results of your choices as long as you own the house. It is very difficult to go back and make the door bigger or smaller, which is not always possible.

All interior doors in your home should have the same style/design. If you have non-standard doors, you should choose a door that comes in all the required sizes.

The most economical interior doors are those with general dimensions, so it makes sense to choose them for most rooms.

If you plan to age in your home or currently have mobility issues, consider making all doors 36 inches wide. This choice will allow you to navigate your home if you need a walker or wheelchair, and make your home accessible to any guests or future homeowners.

Finally, consider the finish of your interior door. Should it be painted or stained? Two coats of primer and two coats of paint can add up to 1/32 of an inch to each edge of the door. Consult with your installer, as this may affect the size of the rough design you need.

Standard door frame size

Door frames are the pieces of wood that support the door and are inserted into the opening of the body. Hinges are then used to connect the door to the door frame. There is no standard, but the most common size of a door frame in the United States is 36 inches wide and 80 inches high.

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Dimensions of overhead doors

Pre-hung doors have hinges that already attach the door to the frame. Nail the door frame to the stiles around the rough opening and paint it.

This solution is so popular with do-it-yourselfers for a reason. Hanging a door requires a certain amount of patience and finesse, and even professionals can get started. Buying a prefabricated door eliminates all the guesswork and dexterity.

Pre-hung doors are almost always 80 inches high. They are generally available in two standard widths, 30 inches and 36 inches. Other sizes in non-standard widths are quite possible, they are less common.

Choice of inner door

Interior doors can be simple and straightforward or highly decorative. Choose a door that supports or enhances the architectural style of your home, not its modern design.

Tastes change over time, but doors last a long time and are usually not part of the decor. So you want to make a choice that will look good for years to come.

When comparing doors, pay attention to three things: material (what the door is made of), functionality (how the door will be used) and cost (don’t forget to factor in materials and labor!).

Door materials

The most common material used for interior doors is wood. The cheapest doors have a hollow core and are made of wood or fiberboard.

Solid wood doors are also available. Other materials used for doors include glass, stainless steel, fiberglass and aluminum.

The material and style of your door should match the style and overall atmosphere of your home. For example, an elegant fiberglass door may look perfect in a modern home, but not in a traditional country home.

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Door control

When choosing a door, consider the role it will play in your home. Doors provide both a visual and physical barrier in the room and maintain privacy.

They can also be used to insulate and dampen sound. For this reason, many homeowners choose to install thicker doors in bedrooms or home offices.

Think about how you want the door to move. Should it lead into or out of the room? Should it hang to the left or right of the door frame? You may want to remove the swing door and use a sliding door.

In this case, is there enough room on the side of the rough opening to slide the door all the way to the end? To learn more about the dimensions of sliding doors, click here.

Interior doors connecting a room to a corridor usually open into the room, as this minimizes the risk of collision with a passing person. When an interior door connects two rooms without the presence of a passageway, the direction of movement of the door is determined by convenience.

The cost of the door

For a simple door, you’ll pay between $50 and $500 for the door itself. If you hang it yourself, the only additional cost is your time.

If you opt for professional installation, you will pay between $100 and $300 per door, depending on the location and complexity of the door.

Wing doors are usually slightly more expensive to purchase, but can be less expensive to install.

Frequently asked questions

What are the standard dimensions of interior doors?

Standard widths are 18, 20, 24, 28, 30, 32 and 36 inches. Standard heights are 80, 84 and 96 inches. Custom sizes are available in a wide variety of styles. To measure a hinged door, remove the interior trim and measure the opening.

What is the standard door size in South Africa?

Standard door sizes – South Africa The standard size for interior and exterior doors in South Africa is 813 x 2032 mm.

What are the standard door sizes?

One of the most common dimensions of entry doors in American homes is 36 inches wide by 80 inches high and nearly 2 inches thick. However, not all doors will have these dimensions. Doors can be as narrow as 30 inches and as high as 96 inches, and the thickness can depend on the material of the door.

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