Are Internal Doors a Standard Size?

Are Internal Doors a Standard Size?

Key Takeaways

Door Type Standard Sizes (Height x Width)
Single Doors 1981mm x 610mm, 1981mm x 686mm, 1981mm x 762mm, 1981mm x 838mm
Double Doors 1981mm x 1220mm, 1981mm x 1372mm, 1981mm x 1524mm
Sliding Doors Vary depending on the opening size
Custom Doors Made to specific measurements


When shopping for internal doors, one of the most common questions homeowners ask is whether these doors come in standard sizes. The answer is yes, most internal doors are available in a range of standard sizes, which can make the selection and installation process more straightforward. However, it's essential to understand that there may be variations in size and that custom options are also available for unique spaces or specific requirements.

Standard Internal Door Sizes

Standard internal door sizes are designed to fit most common door frames and openings. These sizes are typically expressed in terms of the door's width and height, measured in inches. The most common standard sizes for single internal doors are:

  • 1981mm x 610mm
  • 1981mm x 686mm
  • 1981mm x 762mm
  • 1981mm x 838mm

For double doors, standard sizes include:

  • 1981mm x 1220mm (two 610mm doors)
  • 1981mm x 1372mm (two 686mm doors)
  • 1981mm x 1524mm (two 762mm doors)

It's important to note that these measurements refer to the actual door slab, not the rough opening or the door frame. When measuring for a new internal door, be sure to follow the proper techniques to ensure an accurate fit. Our blog post, "The Simple Guide to Measuring Your Door", provides a helpful step-by-step guide to measuring your door opening correctly.

White Eindhoven 1 Panel Internal Door

Variations in Standard Sizes

While most internal doors adhere to standard sizes, there may be slight variations depending on the manufacturer or the specific door style. Some doors may have a slightly different height or width, so it's always best to check the exact measurements before making a purchase.

Additionally, certain types of internal doors, such as sliding doors or pocket doors, may have different size requirements based on the specific opening and the door's mechanism. In these cases, it's essential to measure the opening carefully and consult with the door manufacturer or a professional installer to ensure a proper fit.

Custom Internal Door Sizes

In some cases, standard door sizes may not fit your specific needs or the unique dimensions of your space. If you have an irregularly sized opening or require a specific door size for aesthetic or functional reasons, custom internal doors are an excellent solution.

Custom doors are made to order based on your exact specifications, ensuring a perfect fit for your home. While custom doors may be more expensive than standard-sized options, they offer the flexibility to create a door that meets your precise requirements.

Bespoke Eton 4 Flat Panel Oak Door

Measuring for Your Internal Doors

To ensure that you select the right size internal door for your space, it's crucial to measure your door opening accurately. Our guide, "How to Measure a Door", provides a detailed explanation of the measuring process, including:

  • Measuring the width of the door opening
  • Measuring the height of the door opening
  • Determining the thickness of the door
  • Accounting for any trim or hardware

By following these steps and double-checking your measurements, you can be confident in selecting the perfect internal door size for your home.


In summary, most internal doors come in standard sizes, which can simplify the selection and installation process for homeowners. However, it's essential to be aware of potential variations in size and to measure your door opening accurately to ensure a proper fit. For unique spaces or specific requirements, custom internal doors offer the flexibility to create a door that meets your exact needs.

When shopping for internal doors, consult our guides on "The Simple Guide to Measuring Your Door" and "How to Measure a Door" to ensure that you select the perfect size for your home. With the right measurements and a clear understanding of your options, you can find the ideal internal door to enhance the beauty, functionality, and style of your space.