folding door sizes

Folding Door Sizes: A Comprehensive Guide

By Steven SmithDecember 5, 2025

Folding doors, with their space-saving design and aesthetic appeal, have become a popular choice for both residential and commercial spaces. However, selecting the right size for your folding door can be a daunting task, given the variety of options available. This guide will help you understand folding door sizes, their applications, and how to choose the perfect fit for your needs.

Folding doors, also known as bi-fold or accordion doors, are designed to open and close by folding back on themselves. They are typically made of glass, wood, or metal, and can be used as room dividers, closet doors, or even as exterior doors. The size of a folding door is measured in width and height, with the width being the most crucial factor to consider.

Standard Folding Door Sizes

Folding doors come in a range of standard sizes to accommodate various applications. Understanding these standard sizes can help you narrow down your options.

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For interior use, common widths range from 36 inches to 72 inches, with heights typically between 80 inches and 96 inches. Exterior folding doors, on the other hand, can be wider and taller, with widths up to 108 inches and heights up to 108 inches.

Width Considerations

The width of your folding door will depend on the size of the opening and the amount of space you need to cover. For instance, a 36-inch wide door is suitable for closet doors or small room dividers, while a 72-inch wide door can be used as a patio door or to divide larger spaces.

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When choosing the width, ensure that the door can fully open and close within the available space. Also, consider the number of panels; wider doors will have fewer panels, while narrower doors will have more, affecting the overall look and functionality.

Height Considerations

The height of your folding door should match the height of the opening to ensure a proper fit and maintain the structural integrity of the door. Standard door heights are 80 inches for interior doors and 96 inches for exterior doors, but custom heights are available.

If you're using the folding door as a room divider, you might want to consider a door that's slightly taller than the average person's height to ensure privacy. However, if you're using it as an exterior door, ensure it's tall enough to accommodate your specific needs, such as wheelchair access.

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Custom Folding Door Sizes

While standard sizes offer a convenient starting point, they may not always fit your specific needs. In such cases, custom folding doors provide a tailored solution.

Custom doors can be made to fit any width or height, making them ideal for unique architectural features or non-standard openings. However, custom doors can be more expensive and may require additional time for manufacturing and installation.

Width Considerations for Custom Doors

When ordering a custom folding door, you can specify the width that best fits your space. However, keep in mind that very wide doors may require additional hardware for support and may not fold as smoothly as narrower doors.

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Also, consider the number of panels you want. More panels will allow for a wider door, but they may also make the door heavier and more difficult to operate.

Height Considerations for Custom Doors

Custom doors can be made to any height, but again, ensure that the door is compatible with your opening and that it meets any relevant building codes or accessibility requirements.

For example, if you're using the door as an exterior entrance, it should be at least 80 inches tall to accommodate most people. However, if you're using it as an interior room divider, you might want a door that's slightly taller than average to ensure privacy.

In conclusion, choosing the right folding door size involves careful consideration of your space, your needs, and any relevant building codes. Whether you opt for a standard size or a custom door, understanding the width and height considerations will help you make an informed decision. So, measure twice, and order once to ensure your folding door is the perfect fit.