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How to Measure for Bifold Doors

How to Measure for Bifold Doors

Bifold doors, also known as folding doors or accordion doors, are a type of interior and exterior door that consists of two or more panels that fold together in the middle in a concertina-like manner when opened, and stack neatly to the side when closed. These doors are commonly used to create open spaces between rooms, or to provide access to outdoor areas, such as patios or decks.

They are often made of glass panels, which allow for natural light to flow through and provide a seamless connection between indoor and outdoor spaces. Accurate measurement is essential when choosing new bifold doors as it ensures proper fit, clearance, compatibility with hardware and track, and desired aesthetics.

How to Measure a Bifold Door 

Bifold Door

Bifold doors are a popular choice for closets and other areas in the home due to their space-saving design. To obtain an accurate measurement of your existing bifold door, you'll need to measure the various internal bifold door sizes, width, door height, and hardware of a bifold door. Let us take a look at these steps in detail.

Step 1: Measure The Door Width  

For measuring the width of a bifold door, it is necessary to determine the door opening width as well as the door panel width.
  • Determine Door Opening Width

Measure the width of the door opening where you want to install the interior bifold doors next. Measure from the inside edge of the door jamb on one side to the inside edge of the door jamb on the opposite side. Record this measurement as the door opening width.
  • Determine Door Panel Width

    Bifold doors consist of two panels that fold together in the center, so the total width of both panels should be slightly less than the door opening width to allow for proper clearance. To determine the width of each panel, divide the door opening width by the number of panels you plan to install (usually 2) and subtract about 1 inch to allow for clearance. 

    Step 2: Measure The Door Height 

      To measure the height of a bifold door, it is essential to determine the door opening height as well as the door panel height.
      • Determine Door Opening Height

        Measure the height of the folding door opening from the floor to the top of the opening. Measure on both the left and right sides of the subfloor and the opening, and record the shortest measurement as the door opening height. This is important to ensure that the bifold doors fit properly and do not scrape against the ceiling or floor.
        • Determine the Door Panel Height

          The height of the door panels should be slightly less than the door opening height to allow enough space for proper clearance. Typically, the height of each door panel is about 1/2 to 1 inch less than the door opening height. Measure and record the measurements for the height of each door panel.

          Step 3: Measure For Hardware 

          Take into account the hardware and track for the bifold doors. The hardware and track will add some width to each panel, so make sure to consider this when measuring the door opening width and determining the width of each door panel. 

          Depending on the type of interior bifold and door hardware you plan to install, such as top-mount or bottom-mount hardware, you may need to consider the location of pivot points, hinges, and brackets.

          By following these steps, you can accurately measure for bifold doors and ensure that you order the correct size for your door opening.


          Investing in high-quality bifold doors is necessary for their durability, energy efficiency, security, aesthetics, and functionality of the door. To purchase good quality external doors and internal doors, choose from Emerald Door's wide range of door options.

          FAQs on How to Measure Bifold Doors 

          • How do I know what size bifold door to buy? 

          To determine what size bifold door to buy, you will need to measure the door opening width, height, and depth, and consider factors such as the number of door panels, desired clearance, and any hardware or knobs that will be installed on the bifold door.
          • Can you cut bifold doors to fit width? 

          It is not recommended to cut bifold doors to fit the width, as it may affect the structural integrity and functionality of the doors, and cutting them may compromise their performance and durability. However, in some cases, it may be possible to trim a small amount from the width of rough opening of a bifold door, depending on the construction and design of the bifolding door.
          • How big a gap do you need for bifold doors? 

          As a general guideline, a typical gap for bifold doors is about 1/8 inch to 1/4 inch (3mm to 6mm) between structural openings of each pair of door panels when they are in the closed position. However, the recommended gap for bifold doors can vary depending on the manufacturer, design, and specific installation requirements.
          • Are bifold doors flush with the floor? 

          Whether bifold doors are flush with the door or not depends upon the design and installation of the door. Some bifold doors are designed to be installed flush with the floor, without any threshold or gap to create a seamless transition between the indoor and outdoor spaces or between different rooms, providing a sleek and modern look.

          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.