Are you considering installing bi-fold doors in your home or office space? One of the essential steps to ensure a seamless installation and optimal functionality is to accurately size the wall opening. In this article, we will discuss how to measure and determine the appropriate dimensions for your Warren Window bi-fold doors.

Measuring the Width and Height of the Opening

To begin, measure the width of the opening at three different points, taking note of the smallest measurement. It is crucial to consider any variations in the width of the opening to ensure that you obtain the correct measurement. Next, measure the height from the floor to the top of the opening, again considering any flooring variations. Deduct approximately 10-12mm from both the width and height measurements to allow for smooth operation and clearance.

Standard Sizes for Bi-Fold Doors

Bi-fold doors are typically available in standard sizes. When working with an even number of doors, each individual door leaf should be a minimum of 28 inches wide. Conversely, when working with an odd number of doors, each door should have a width of at least 16 inches. The common height for bi-fold doors is typically 80 inches. These standard sizes can be readily found at various hardware stores, providing convenient options for homeowners seeking to incorporate bi-fold doors into their living spaces.


Accurately sizing the wall opening for your Warren Window bi-fold doors is crucial to ensure a seamless installation and optimal functionality. By taking precise measurements of the width and height of the opening and considering the standard sizes available for bi-fold doors, you can confidently select the appropriate dimensions for your living space. Visit the Warren Window website for more information on our bi-fold doors and other glass products.