How to Choose the Right Bi-Fold Door Sizes

Bi-fold door sizes vary depending on the style, configuration, and how much space you have available for the door. Choosing the right size ensures your doors fold smoothly and fit perfectly in the opening.

Common Bi-Fold Door Sizes

Bi-fold doors typically come in standard heights of 80 or 96 inches. Our standard bi-fold doors come in four standard heights: 80, 84, 92 ½, and 96 inches.

Standard bi-fold door widths range from 18 to 36 inches. Our standard panel widths are 18, 24, 28, 30, 32, and 36 inches.

A standard two-panel door configuration would span 24 to 36 inches total, while four-panel doors stretch across 48, 60, or 72 inches. These measurements are the finished width of the opening, not the width of each panel. For example, a 36-inch opening might use two 18-inch panels.

Understanding Nominal and Actual Sizes

Nominal size is the number printed on the packaging or listed in the product description. It's a general label for classification, but not the exact measurement of the door. The nominal size makes it easier to identify and compare products.

Actual size is what the door measures once it is manufactured. It is always slightly smaller than the nominal size. This difference of around half an inch in the width and one inch in the height allows room for the hinges, tracks, and smooth movement inside the frame.

Understanding these two sizes matters when matching a door to your framed opening. Always work from the actual size when confirming the panel size.

How to Measure for Bi-Fold Doors

Accurate measurements are key to getting a bi-fold door that fits and functions correctly. Before you start, grab a tape measure, large spirit level, pencil, and paper, or use your phone to record the numbers.

Start by clearing the opening of any trim pieces, debris, or leftover hardware. You want a clean frame so you can measure the true width and height without any obstructions.

Ensure the Opening Is Level and Square

Use a large spirit level to check that the top of the opening is level. A sloped header can cause the doors to hang unevenly or slide incorrectly.

Next, check that the opening is square. Begin by measuring diagonally from corner to corner in both directions. If the two measurements match, the frame is square. If they don't match, you'll need to make adjustments to the opening to ensure it's square before proceeding.

Measure the Opening Width

Place your tape measure at the upper inside edge of the opening on one side and stretch it across to the opposite side to find the width. Repeat this across the center and bottom of the opening. Openings can be slightly uneven, so you’ll need to write down the smallest measurement.

Measure the Opening Height

Place your tape measure at the inside edge of the opening on one side and stretch it vertically to the floor. Take this measurement on the left, middle, and right sides of the frame. Write down the shortest of the three heights.

Tip: Always measure after your finished flooring is installed. The door needs to fit the actual floor height, not the subfloor.

Allow for Fitting Tolerance

It is important to allow for the fitting tolerance to ensure your new bi-fold door fits and operates correctly. This is done by subtracting half an inch from your smallest width and height measurements to allow for hinges and tracks.

Tip: Make sure nothing nearby blocks the door's path when it folds open. Check for furniture, light switches, or wall trim that could get in the way.

Single vs Double Bi-Fold Configurations

A single bi-fold door has one set of panels that fold to one side. This works well for a small opening, such as hallway closets or linen storage, when only one side needs to be accessed.

A double bi-fold door has two sets of panels that fold away from the center. This configuration opens wide and allows for full access to the space behind it. Walk-in closets, laundry rooms, and pantries often benefit from double bi-fold doors.

Custom Bi-Fold Door Sizes

Custom bi-fold doors are made to fit your exact measurements. They're a smart option for spaces that fall outside typical sizes. For example, a laundry closet tucked into a hallway might need a 44-inch width, while a tall pantry in an older home may require a 92-inch height.

Most custom orders require longer lead times, depending on the design you require. Costs also vary, but the added investment often prevents larger remodeling costs later.

Why Homeowners Choose Bi-Fold Doors

Bi-fold doors save space and give homes a streamlined feel. Whether you want clean wood panels or bold glass finishes, there's a look to fit your space. If you're still comparing options, check out our guide to choosing interior doors for help with configurations and finishes.

Bi-Fold Door FAQs

Where Are the Best Places to Install Bi-Fold Doors? Bi-fold doors are a smart choice for closets, laundry areas, pantries, and utility areas. They also work great as room dividers or for closing off a home office. If you're exploring bi-fold door ideas, look for places where saving space and adding flexibility make a difference.

Should I Install Bi-Fold Doors Myself?

It's possible to install bi-fold doors if you're handy with tools and follow the instructions carefully. DIY installations will often save you money. However, professional installation services ensure correct hardware placement, top-notch alignment, and smooth operation.

Attempting a DIY project without the proper training, safety precautions, or personal protective equipment also puts you at a higher risk of ending up in the ER due to injuries. If you’re inexperienced or don’t have the proper equipment, don’t risk it—call a professional to install your bi-fold doors for you.

Can Bi-Fold Doors Be Trimmed to Fit?

Some bi-fold doors can be trimmed slightly, but this depends on the material and design. Trimming too much may affect the structural integrity or how the panels fold. If your opening isn't standard, it's better to order a custom size instead of modifying a bi-fold door.

Get the Perfect Fit With Professional Help Choosing the correct bi-fold door size ensures your doors fit well and operate smoothly. Taking accurate measurements and allowing for fitting clearance prevents common installation problems.

Consulting a professional is important for any installation, whether it is standard or custom bi-fold doors. Experts can help with details like tricky openings or hardware setup to ensure a proper fit and smooth operation.