Left Continue shopping
Your Order

You have no items in your cart

Read more
Internal Door Sizes

Internal Door Sizes - A Complete Guide

When renovating or building a home, internal doors play a crucial role in defining the flow and aesthetics of the space. Choosing the right door size is essential to ensure functionality and harmony within the interior design. 

In the UK, internal door sizes follow certain standards and variations, which can sometimes be confusing for homeowners. This complete guide will walk you through the various common internal door sizes, helping you make informed decisions for your home.

Internal Door Sizes in the UK: Metric Vs Imperial

Metric internal door sizes are based on millimeters (mm) and have become more prevalent in modern construction due to their ease of use, accuracy, and compatibility with standardized measurements. The most common metric internal door sizes include 1981mm x 762mm x 35mm (2'6" door) and 2040mm x 826mm x 40mm. 

On the other hand, imperial internal door sizes are based on inches and feet. These measurements were widely used in the past and are still seen in older homes and buildings. The most common imperial internal door sizes are 78 inches x 30 inches x 1 3/8 inches (2'6" door) and 80 inches x 32 inches x 1 3/4 inches (2'8" door).

Metric (mm)

Imperial (inches)

Imperial (feet & inches)

1981 x 305

78" x 12"

6ft 6" x 1 ft

1981 x 381

78" x 15"

6ft 6" x 1 ft 3"

1981 x 457

78" x 18"

6ft 6" x 1ft 6"

1981 x 533

78" x 21"

6ft 6" x 1 ft 9"

1981 x 610

78" x 24"

6ft 6" x 2ft

1981 x 686

78" x 27"

6ft 6" x 2ft 3"

1981 x 711

78" x 28"

6ft 6" x 2ft 4"

1981 x 762

78" x 30"

6ft 6" x 2ft 6"

1981 x 838

78" x 33"

6ft 6" x 2ft 9"

1981 x 864

78" x 34"

6ft 6" x 2ft 10"

1981 x 913

78" x 35.9"

6ft 6" x 2ft 11.9"

2032 x 813

80" x 32"

6ft 8" x 2ft 8"

2040 x 526

80.3" x 20.7"

6ft 8.3" x 1ft 8.7"

2040 x 626

80.3" x 24.6"

6ft 8.3" x 2ft 0.6"

2040 x 726

80.3" x 28.6"

6ft 8.3" x 2ft 4.6"

2040 x 826

80.3" x 32.5"

6ft 8.3" x 2ft 8.5"

2040 x 926

80.3" x 36.5"

6ft 8.3" x 3ft 0.5"

2134 x 915

84″ x 36″

7 ft x 3 ft

What is the Standard Internal Door Size? 

Door sizes are typically given in metric units (mm). The measurements for metric door sizes consist of three main components:

  • Standard Internal Door Height in the UK

The height of the door is the vertical measurement from the bottom to the top. The standard internal door height in the UK is 1981mm (6ft 6 inches).
  • Standard Internal Door Width in the UK

The width of the door refers to the horizontal measurement from one side to the other. The standard internal door width in the UK is 762mm (2ft 6 inches).
  • Standard Internal Door Frame Size

The average internal door frame size in the UK is typically around 762mm (30 inches) in width and 1981mm (78 inches) in height. However, it's important to note that door frame width and sizes can vary depending on the specific building and construction standards.

Factors Affecting Internal Door Sizes

Several factors can influence the choice of internal door sizes for your home. Understanding these factors will help you determine the most suitable internal door sizing and dimensions:

  • Room Size and Layout

The size of the room plays a crucial role in selecting the appropriate door width and size. Larger rooms with spacious layouts can accommodate wider doors, while smaller rooms with limited wall space might require narrower doors to optimize space utilization.
  • Door Functionality

The functionality of the door is another significant consideration. For instance, a door between the kitchen and the dining area might need to be wide enough to allow easy passage of food trays. A door leading to a bathroom or bedroom might require a smaller door of standard size for privacy and convenience.
  • Accessibility Requirements

For accessibility purposes, the average door width should be wide enough to provide wheelchair access to individuals with mobility challenges. This is particularly important in areas like bathrooms or bedrooms.
  • Architectural Style and Design

The overall architectural style and design of the house should also be taken into account. Traditional homes might suit classic panel doors, while contemporary spaces could benefit from sleek and modern designs.
  • Personal Preferences

At the end of the day, personal preferences matter. If you have a specific vision for your home's interior design, the door size and style should align with your tastes and aesthetic choices.

How to Measure Internal Doors

Whether you are looking to replace your existing internal doors or purchase new ones for your home, taking accurate measurements is necessary. This implies not only to the doors but also to the door frames. To accurately measure your internal doors, start by measuring the height, width, and thickness of the existing door and the door frame. Note down all the measurements and select your new door accordingly.

Customizing Internal Door Sizes

While common internal door sizes can fulfill the requirements of most homes, there are situations where custom-sized doors are necessary. If your door openings do not match the standard door sizes, or you have specific design preferences that cannot be met with off-the-shelf doors or single-door width, consider custom-made doors.

Custom-made internal doors offer numerous advantages over standard doors, such as:

  1. Precise Fit: Custom doors are made to measure, ensuring a perfect fit for your door openings.
  2. Unique Designs: You have the freedom to choose unique designs, finishes, and materials that align with your interior design vision.
  3. Variety of Materials: Custom doors can be crafted from a wide range of materials, including hardwood, softwood, glass, or composite materials.
  4. Special Requirements: If you have special requirements, such as extra door thickness for additional insulation or bespoke shapes, custom-made doors can meet these needs.

Tips for Choosing the Right Internal Door Size

Follow these tips to select the perfect size for your internal door.

  • Measure Twice, Buy Once

Accurate measurements are crucial. Measure the door frame's width, height, and depth multiple times to avoid costly mistakes.
  • Consider Door Swings

When choosing door sizes, consider the direction of the door swing. You don't want a door that opens into furniture or obstructs pathways.
  • Quality Matters

Invest in high-quality internal doors made from durable materials. Well-crafted doors will not only enhance the aesthetics of your home but also improve its overall value.
  • Consider Fire Safety

In certain areas, building regulations may require fire-rated doors. Ensure compliance with safety regulations when choosing fire doors for specific rooms.

    Standard Door Size Guide

    Standard Internal Door


    If you don’t want an ill-fitted door in your home, follow our complete door size conversion chart, that not just explains common door sizes, but also how to measure one perfectly.


    Internal doors are more than just functional elements within a home; they are architectural features that contribute to the overall aesthetics and functionality of a space. Understanding the various internal door styles and sizes available in the UK allows you to make informed decisions that suit your needs, style preferences, and the layout of wall space within your home. Apart from internal doors, if you require good quality external doors for your home, check out Emerald Doors amazing collection.

    FAQs on Internal Door Sizes

    • What is the standard thickness of an internal door? 

    The standard thickness of an internal door is typically between 35 mm to 44 mm. This door thickness is commonly used for internal doors in residential and commercial buildings.
    • What is standard interior door size framing? 

    The standard interior door size framing is typically 2 inches wider and 2 1/2 inches, slightly taller, than the actual door size. For example, for a standard interior door of 30 inches by 80 inches, the average width of the framing rough opening would be 32 inches by 82 1/2 inches.
    • How do you fit interior doors? 

    To fit interior doors, follow these general steps:
    1. Measure the door frame and ensure it's square.
    2. Trim the door to fit if needed, considering the bottom if it drags on the floor.
    3. Install hinges on the door and frame, then hang the door.
    4. Test the swing and adjust as necessary.
    5. Install the doorknob and latch.



    Shabana Kauser is the dynamic owner of Emerald Doors, the famous door-selling company in the UK with immense knowledge and experience in working with architecture, interior design, and home decor. She continues to share tips and technical know-how of balancing interior elements, door fittings, room aesthetics, and the like. Personally, she loves coffee, always dabbling with several blends.

    Author: Shabana kauser

    Shabana Kauser, the Director of Emerald Doors, brings over 20 years of invaluable expertise in the door industry. Her visionary leadership has steered the company to new heights, offering an extensive range of internal and external doors while prioritizing quality and customer satisfaction. The website's glowing reviews stand as a testament to her commitment to excellence. To learn more about Emerald Doors, connect with us on Instagram, Facebook, Twitter, and Pinterest.