French Door Sizes: Standard Dimensions & Expert Guide

French doors are timeless, elegant, and functional. Whether you're renovating your home, designing a new office, or planning a hospitality project, choosing the right French door size is crucial to achieving both aesthetics and performance. In this guide, Zonle Doors outlines everything you need to know—from standard sizes and measurement techniques to rough opening tips and custom solutions.

Standard French Door Sizes

French doors come in a variety of dimensions depending on the number of panels and the intended space. Below are the most common industry-standard sizes:

Tip:

The most popular double door size is 72" x 80" (two 36" wide panels).

How to Measure a French Door

Getting your French door size right starts with accurate measurement. Here's a simple step-by-step process:

1. Measure the width from stud to stud (not trim to trim).
2. Measure the height from floor to the underside of the header.
3. Take three measurements (top, middle, bottom) and use the smallest.

Understanding Rough Opening Requirements

The rough opening should be larger than the actual door frame to allow for leveling and shimming. Here's how much space to add:

• Add 2" to width and 2.5" to height as a general rule.
• Example: A 72" x 80" double French door needs a rough opening of approximately 74" x 82.5".

Single vs. Double French Doors

You've heard these terms a lot. But what are they really?

• Single French Doors: One door slab that swings open. Great for tight interiors — home offices, bathrooms, or bedrooms where a little light and elegance go a long way.
• Double French Doors: Two doors that open from the center, often meeting in the middle without a central pillar. Perfect for living rooms, patios, or large openings.

In both styles, glass plays a key role. Some are made entirely of glass, from top to bottom. Others have decorative grids (called mullions), frosted panels, or even colored glass for more privacy.

The choice of door style might alter overall French door size, but it certainly changes the feel of the space. In case you want to know where to buy the French doors in all these designs and sizes, check out this collection of French doors by George Furniture.

Single French Doors

Double French Doors

How to Choose the Right Size

Size selection depends on:

• Room scale: A small room may look overwhelmed by oversized double doors.
• Usage: High-traffic commercial entries often benefit from wider custom sizes.
• Wall structure: Ensure the wall can support the door system's weight and size.

Common Mistakes to Avoid

• Not accounting for trim or molding width.
• Ignoring flooring level differences between two rooms.
• Using external frame dimensions instead of slab size for calculations.

Custom Sizes from Zonle Doors

At Zonle Doors, we specialize in custom French door solutions for B2B clients across residential, hospitality, and commercial projects. With our 4 production bases and 58 production lines, we can manufacture doors in any dimension, finish, or configuration—including fire-rated, WPC, and steel-framed French doors.

All products are tested in-house to meet durability, insulation, and safety standards globally.

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