Barn Door Sizes: Complete Guide to Ordering the Right Size

Quick Answer: Before buying a barn door, confirm your opening width and height, then add 4 inches to the width (2 inches overlap per side) and at least 1 inch to the height. Check that you have flat wall clearance beside the opening equal to at least the door width. Standard barn doors run 80-84 inches tall; widths commonly range from 28 to 60 inches in 2-inch increments. When in doubt, order slightly larger - a barn door can be trimmed, but it cannot be added to.

Ordering the wrong size barn door is a frustrating and costly mistake. Getting the size right requires understanding a few basic principles about how barn doors work - they are not sized the same way a traditional swinging door is sized. Here is a complete sizing guide.

Why Barn Doors Are Sized Larger Than the Opening

A traditional swinging door is sized to fit exactly within the door frame. A barn door slides on a track above the opening and sits in front of the wall - it does not fit inside the frame. Instead, it must overlap the wall around the opening on all sides to provide privacy and block light. The standard overlap is 2 inches on each side of the width and 1 inch at the top.

How to Calculate Your Door Width

Measure the rough opening width at the widest point (measure at top, middle, and bottom - use the largest measurement). Add 4 inches.

• 28-inch opening: order a 32-inch door
• 30-inch opening: order a 34-inch door
• 32-inch opening: order a 36-inch door
• 36-inch opening: order a 40-inch door
• 48-inch opening: order a 52-inch door (or two 28-inch doors for a bi-part pair)

If the calculated width falls between standard sizes, round up to the next available size. A slightly larger door with more overlap is better than one that does not fully cover the opening.

How to Calculate Your Door Height

Measure the opening height from the floor to the top of the rough opening or top of the casing. Add at least 1 inch for overlap at the top. In most homes with 8-foot ceilings, a standard 84-inch (7-foot) door works for openings up to 83 inches tall. For taller openings or ceilings, measure carefully and order accordingly.

Note: barn doors do not touch the floor - they hang from the track with a 1/2 to 1 inch gap above the floor. This is normal and necessary for the floor guide to work.

Wall Clearance: The Often-Missed Measurement

When the door slides open, it travels along the wall beside the opening. You need a flat, unobstructed wall section at least as wide as the door. Measure from the edge of the opening to the nearest obstruction: a light switch, outlet, corner, window, or adjacent door frame.

• If the clearance equals or exceeds the door width: a single sliding door works
• If clearance is less than the door width: consider a bi-part (double door) setup where each panel is half the opening width, sliding to opposite sides
• If clearance is very limited on both sides: a bypass door system (two doors on parallel tracks that slide past each other) is an option

Standard Barn Door Sizes

Track Length

The sliding track must be at least twice the door width so the door can slide fully open. Most hardware kits match the track length to the door width when ordered together. If ordering track separately, use the formula: track length = door width x 2.

Browse Dogberry Collections' barn doors in a range of standard sizes with hardware kits included - each listing shows the door dimensions, opening size range, and track length so you can confirm fit before ordering. Questions about sizing? Call (435) 923-4100 Mon-Fri, 8am-4pm MT.