Standard Interior Door Size & Dimensions | Measurement Guide

Last Updated on September 8, 2023 by Kimberly Crawford

Understanding the standard sizes of interior doors is a fundamental aspect of home construction, renovation, and design. It is a detail that might seem insignificant at first glance but plays a crucial role in the functionality and aesthetics of your living space.

Doors serve as the gateway to different spaces within your home. They provide privacy, sound control, and contribute significantly to the overall design theme. The size of the door can impact how comfortably we move through these spaces, especially when carrying furniture or other large items.

Moreover, door sizes have a profound influence on the interior design of a room. A door that is too large may overpower a small space, making it feel cramped. On the other hand, a door that is too small may look out of proportion in a large room. Therefore, knowing the standard door sizes can guide you in making informed decisions when designing or redesigning your home.

In this guide, we will delve into the world of standard interior door sizes, why they matter, and how you can choose the right door size for your needs. Whether you are a homeowner planning a renovation or a professional interior designer, this information will be invaluable in your project planning.

Understanding Door Dimensions

interior door

When we talk about door dimensions, we’re referring to the width and height of the door. These dimensions are typically measured in inches in the United States or millimeters in many other parts of the world.

How are Door Dimensions Measured?

Door dimensions are measured using a simple tape measure. The width is measured across the face of the door from one side to the other. The height, on the other hand, is measured from the bottom of the door to the top.

It’s worth noting that measurements should be taken across the widest and tallest parts of the door to ensure accuracy. For instance, if the door has panels or mouldings that protrude beyond the main face of the door, these should be included in your measurements.

Door Size vs Opening Size

The door size and the opening size are two different things, and it’s crucial to understand the distinction between the two when planning your interior design.

The door size refers to the actual dimensions of the door itself – its width and height as discussed above.

The opening size, also known as the door frame or rough opening size, is slightly larger than the door. This is the opening in the wall where the door will be installed. The additional space allows for the door jamb (the surrounding frame), as well as a small amount of room for adjustment during installation.

As a rule of thumb, the rough opening size should be about 2 inches wider and 2.5 inches taller than the door itself. For example, if you have a standard 36-inch wide door, the rough opening should be about 38 inches wide.

Standard Interior Door Sizes

Standard door sizes can vary depending on the country and the specific type of door. However, there are some common dimensions that are frequently used in residential properties. Here are the standard interior door sizes typically used in the United States:

  • 24 x 80 inches: This is often used for closets or small bathrooms.
  • 30 x 80 inches: This size is commonly used for bedrooms, bathrooms, and other interior rooms.
  • 32 x 80 inches: This size is also used for bedrooms, bathrooms, and other interior rooms.
  • 36 x 80 inches: This size is typically used for entryways or larger rooms.

In the UK and other countries that use metric measurements, standard door sizes are usually:

  • 610 x 1981 mm: Equivalent to 24 x 78 inches, used for closets and small bathrooms.
  • 762 x 1981 mm: Equivalent to 30 x 78 inches, used for bedrooms and bathrooms.
  • 838 x 1981 mm: Equivalent to 33 x 78 inches, used for larger rooms or entryways.

It’s important to note that these are just the standard sizes. Custom sizes are available, and older homes may have doors that do not adhere to these standards.

Keep in mind, the thickness of interior doors is typically 1 3/8 inches in the U.S. but can vary based on type and style of the door.

Types of Interior Doors

There are several types of interior doors, each with its own aesthetic and functional characteristics. The type of door can sometimes affect the standard sizes available. Here are some common types:

Panel Doors

Panel doors, often found in traditional or classic-style homes, feature a series of panels (either raised or recessed) set into the door for decoration. They can have a variety of panel configurations, such as four, six, or eight panels.

The standard sizes for panel doors tend to align with those mentioned above, but custom sizes can be made depending on the number and arrangement of the panels.

Flush Doors

Flush doors have a flat surface, offering a clean and minimalist look that works well in contemporary or modern interiors. They are typically made from a single piece of plywood or MDF attached to a wooden frame.

The standard sizes of flush doors are similar to panel doors, but they are often available in a wider range of widths due to their simpler construction.

French Doors

French doors consist of a pair of doors fitted with large areas of glass panes. They are often used to divide rooms while still allowing light to pass through, creating a sense of openness.

The sizes of French doors can vary widely, depending on the size of the opening they are designed to fill. Each door in a pair of French doors may be narrower than a standard single door, but together they often fit within a standard-sized opening.

Sliding Doors

Sliding doors, also known as bypass doors, are commonly used for closets or as room dividers. They move sideways on tracks rather than swinging open. Sliding doors usually come in wider sizes to cover larger openings, with standard widths including 48 inches (two 24 inch panels) or 60 and 72 inches (two 30 or 36 inch panels).

Custom Door Sizes

When and Why You Might Need a Custom Door Size

There are several instances when you might need a custom door size. Here are some common scenarios:

  1. Non-standard door openings: If your home is older or uniquely designed, it might have non-standard door openings. In these cases, a custom door size may be necessary to correctly fit the space.
  2. Accessibility needs: For individuals using wheelchairs or other mobility aids, doors may need to be wider than standard sizes to allow for easy access.
  3. Design considerations: Sometimes, a specific design vision calls for unusual door sizes. For instance, you might want oversized doors for a dramatic effect or smaller doors to match a particular architectural style.
  4. Replacement doors: If you’re replacing an existing door that isn’t a standard size, you may need a custom door to fit the existing frame or opening.

The Process of Ordering a Custom-Sized Door

Ordering a custom-sized door involves a few key steps:

  1. Measure Correctly: The first step is to accurately measure the door opening. This includes the width, height, and thickness of the space. It’s also helpful to take pictures of the opening to provide additional context for the manufacturer.
  2. Choose Your Design: Once you have your measurements, you can select the design you want for your door. This includes the type of door (panel, flush, French, etc.), the material it’s made from, and any additional features like windows or hardware.
  3. Place Your Order: With your measurements and design in hand, you can place your order with a door manufacturer. Some manufacturers specialize in custom doors and can guide you through the process to ensure you get exactly what you need.
  4. Wait for Manufacturing: The manufacturing time for custom doors can vary. Depending on the complexity of the design and the manufacturer’s workload, it can take anywhere from a few weeks to a few months to complete your custom door.
  5. Installation: Once your door is ready, it will need to be installed. This process can be complex, especially if the door is a non-standard size, so it’s often best to hire a professional to ensure it’s done correctly.

Considerations When Choosing an Interior Door Size

Choosing the right door size for your interior spaces is not just about fitting the door into the opening. Various factors can influence your decision, and it’s essential to consider how the door will impact room layout and functionality. Here are some critical considerations:

Room Size

The size of the room can dictate the appropriate door size. For smaller rooms or closets, a narrower door may be sufficient and save valuable space. For larger rooms or main entrances within the home, wider doors can provide a sense of grandeur.


If someone in your home uses a wheelchair or other mobility aids, you need to consider accessibility when choosing a door size. The Americans with Disabilities Act (ADA) recommends doorways be at least 36 inches wide for wheelchair accessibility.


For bathrooms or bedrooms where privacy is paramount, the door size should not only fit the opening but also provide adequate coverage when closed. A door that is too small might leave gaps or not close properly, compromising privacy.

Sound Insulation

If you’re looking to reduce noise transmission between rooms, consider the door’s size and thickness. Larger, heavier doors tend to provide better sound insulation than thinner, smaller ones.

Traffic Flow

Consider the amount of traffic a doorway will see. High-traffic areas may require wider doors to allow people to pass through comfortably without causing a bottleneck.

Room Layout and Functionality

The door size can significantly impact room layout and functionality. A larger door, for instance, might take up wall space that could have been used for furniture or storage. Also, the door swing direction (whether the door opens to the left or right, inward or outward) influenced by the door size can affect how you arrange your room.


Finally, consider how the door size fits into your overall interior design. A door that’s too large or too small can throw off the balance of your design. The door should complement other elements in the room, not overpower them.

FAQs about Interior Door Sizes

1. What is the standard size for interior doors?

The most common standard size for interior doors in the United States is 80 inches tall, 36 inches wide, and 1 3/8 inches thick. However, widths can also range from 24 to 32 inches, depending on the door’s intended use.

2. Can I install a door that is larger or smaller than the standard size?

Yes, you can install a door larger or smaller than the standard size, but it may require alterations to your door frame or the wall itself. This can add to the cost and complexity of the installation.

3. Are closet doors the same size as regular doors?

Closet doors can be the same size as regular doors, but they are often smaller. Bifold or sliding closet doors can also be wider than standard doors, often measuring 48, 60, or 72 inches in width.

4. Are all door openings standard size?

No, not all door openings are standard sizes, particularly in older homes or custom-built properties. It’s always important to measure your door opening before purchasing a new door.

5. How much bigger should the door frame be than the door?

Typically, the door frame should be 2 inches wider and 1 inch taller than the door. This allows space for the door to swing freely and accommodates minor adjustments during installation.

6. Do I need to consider the door thickness when choosing a door?

Yes, the thickness of the door is important to consider. Standard interior doors are usually 1 3/8 inches thick, but exterior doors or doors used for soundproofing may be thicker.


Choosing the right interior door size is a crucial aspect of both interior design and functionality. Standard door sizes in the United States typically measure 80 inches in height, 36 inches in width, and 1 3/8 inches in thickness, but these can vary depending on the door’s intended use and the manufacturer.

However, not all homes adhere to these standard sizes, particularly older or custom-built properties. In such cases, it might be necessary to order a custom-sized door. Other factors like accessibility needs, room size, privacy considerations, sound insulation, traffic flow, and aesthetics also play a significant role in deciding the appropriate door size.

Remember, while the door must fit into the opening, it should also complement your home’s overall design and meet the specific needs of those living in it. A well-chosen door size can enhance the functionality of a room, improve traffic flow, and add to the visual appeal of your space.

In conclusion, door size is more than just a matter of fit; it’s an integral part of creating a comfortable, accessible, and aesthetically pleasing home. Always take the time to consider all the relevant factors before making your final decision.