Standard French door dimensions vary by configuration, manufacturer, and application. In the United States, common heights include 80, 84, and 96 inches, while double French doors are often available in nominal overall widths such as 60, 64, and 72 inches. However, these dimensions are not universal, and the correct size depends on the specific door unit and the available opening.

This guide covers standard French door sizes, single-panel and double-door dimensions, rough opening measurements, and how to measure for the right fit.

1. Standard French Door Dimensions

French doors typically consist of two hinged panels with glass inserts, although some designs use a single hinged door or other configurations. Their dimensions depend on whether they are intended for interior rooms, exterior entrances, or patio access.

Standard French Door Width and Height

The following table provides a general reference for common nominal dimensions in the US market. Actual availability varies by product line and manufacturer.

These are reference ranges rather than a standardized catalog for every French door product. Some manufacturers offer additional sizes, while others provide only selected combinations of width and height.

For double French doors, the overall width generally refers to the combined nominal width of the two panels or the stated door configuration. It should not automatically be treated as the outside dimension of the complete frame.

Standard French Door Height

Common nominal heights include:

• 80 inches: A widely used height for standard interior doors and many residential exterior door configurations.
• 84 inches: An option for taller openings and specific product lines.
• 96 inches: Often used for taller ceilings, larger openings, and contemporary designs.

Not every French door is available in all three heights. Before ordering, confirm the actual unit dimensions and installation requirements for the selected model.

Standard French Door Width

The appropriate width depends on the number of panels, the space available, and how much clear passage is needed.

A narrower configuration may work well between interior rooms, while a wider double-door configuration can provide a more generous connection between a living area and a patio.

When comparing sizes, distinguish the nominal width of the door panels from the overall width of the frame and the clear opening available when the doors are open.

2. Double French Door Dimensions

Double French doors use two door panels within one opening. They are commonly used for patios, garden access, dining rooms, and transitions between interior spaces.

The two panels may be equal in width, although some configurations use an active panel and a secondary panel that opens when needed.

Common Double French Door Sizes

The panel widths in this table are arithmetic examples based on dividing the nominal overall width equally. They are not guaranteed finished panel dimensions or complete unit measurements.

For example, a nominal 72-inch double-door configuration may be described as two 36-inch panels. However, the actual door slab dimensions, frame dimensions, center meeting arrangement, and installation opening may differ.

Always verify whether a supplier’s listed width refers to the door slabs, the nominal assembly, or the complete unit.

How Wide Is Each French Door Panel?

For a pair of equal-width doors, divide the stated overall panel width by two to estimate the nominal width of each panel.

For example:

• 60-inch nominal overall width: approximately 30 inches per panel.
• 72-inch nominal overall width: approximately 36 inches per panel.
• 96-inch nominal overall width: approximately 48 inches per panel.

This calculation is useful for initial planning, but it does not establish the exact slab dimensions or clear passage width.

If accessibility or furniture movement is a concern, evaluate the actual clear opening with the door in its intended open position. The nominal panel width alone does not determine whether an opening meets a particular clearance requirement.

3. Interior vs. Exterior French Door Dimensions

Interior and exterior French doors may share similar nominal heights and widths, but they are designed for different conditions.

Exterior French Door Sizes

Exterior French doors are often used to connect living spaces with patios, decks, balconies, or gardens.

Common nominal heights include 80 inches, while taller options may be available for larger openings. Overall widths vary by product system, and wider configurations may require additional planning for panel weight, frame support, and installation access.

Exterior doors must be suitable for the building’s exposure conditions. Depending on the product and location, important considerations include weather resistance, air leakage, water penetration, thermal performance, glazing safety, and security hardware.

An interior door should not be used as an exterior door simply because its dimensions fit the opening.

Interior French Door Sizes

Interior French doors are commonly used between living rooms, dining rooms, home offices, and other interior spaces.

Common nominal heights include 80 inches, with 84- and 96-inch options available in some product lines. Widths vary according to the opening and whether the design uses one panel or two.

Interior configurations generally do not require the same weatherproofing and exterior exposure provisions as patio doors. However, the selected door must still meet the project’s requirements for privacy, sound control, safety glazing, and other relevant performance considerations.

4. French Door Size vs. Unit Size vs. Rough Opening

Understanding these three measurements is essential when selecting or ordering French doors.

Door Slab Size

The door slab is the individual movable panel without the complete surrounding frame.

For double French doors, each slab has its own width and height. These dimensions may differ from the nominal size used to describe the complete door configuration.

Door Unit Size

The unit size refers to the complete door assembly, including the frame. The exact measurement convention can vary by manufacturer and product documentation.

When comparing product specifications, check whether the stated width and height refer to the outside edges of the frame or another defined measurement.

Rough Opening Size

The rough opening is the structural opening prepared to receive the door unit before the surrounding installation and finish work is completed.

It generally needs to accommodate the complete unit plus the installation clearances specified by the manufacturer. These clearances allow the installer to position, level, plumb, and secure the frame as required.

The rough opening is not necessarily the same size as the door slab or the outside dimensions of the frame.

French Door Rough Opening Dimensions

There is no single rough opening formula that applies to every French door. Some prehung door units require additional width and height beyond the unit dimensions, but the exact allowances depend on the product and installation system.

Use this table as a guide to what should be checked rather than as a universal sizing specification.

Before preparing a new opening or ordering a replacement unit, use the manufacturer’s actual unit dimensions and rough opening requirements. Adding a fixed amount to the nominal door width or height may not produce the correct opening for every product.

5. How to Measure for French Doors

Accurate measurements help determine whether a standard size will work or whether a different configuration is needed.

The correct process depends on whether you are measuring an existing door, an existing opening, or a new construction opening.

Step 1: Determine What You Are Measuring

First, identify whether the measurements are for:

• An existing door slab.
• An existing complete door unit.
• A rough opening for a replacement.
• A new structural opening in a construction project.

These measurements serve different purposes and should not be used interchangeably.

If you are replacing an existing door, do not assume that the old unit’s nominal size is identical to the size of the opening behind its frame.

Step 2: Measure the Width

For an exposed opening, measure the width near the top, middle, and bottom.

Record all three measurements and check for variations. If the opening is irregular, the narrowest measurement is important when determining whether a particular unit can fit, but the opening may also require correction before installation.

For a new opening, confirm the required rough opening dimensions from the selected door’s installation documentation rather than estimating them from the nominal panel width.

Step 3: Measure the Height

Measure the height on the left, in the center, and on the right, using the appropriate reference surfaces for the opening.

For exterior doors, account for the finished floor or threshold condition specified in the project details. Flooring changes and threshold requirements can affect the clearance available beneath the door panels.

Record variations instead of relying on only one measurement.

Step 4: Check the Opening for Squareness and Level

Measure the diagonals of a rectangular opening. If the diagonal measurements differ, the opening may not be square.

Also check the relevant surfaces for level and plumb. A distorted opening can create problems with frame alignment, sealing, and door operation even when the width and height appear sufficient.

Do not compensate for substantial structural irregularities simply by choosing a smaller door. The opening and installation details should be reviewed before the final size is confirmed.

Step 5: Check Wall Depth and Surrounding Conditions

For a prehung door, check whether the frame is compatible with the finished wall depth and trim arrangement.

For exterior installations, review the threshold, sill, flashing, and adjacent wall conditions. Existing openings may need repair or modification before a new door can be installed correctly.

Step 6: Confirm the Measurements Against the Product Specifications

Before ordering, compare your measurements with the manufacturer’s technical drawing and installation requirements.

Confirm the complete unit dimensions, rough opening, panel configuration, handing or swing direction, frame depth, and any required installation clearances.

If the opening is unusual or the measurements are inconsistent, have the conditions checked before committing to a product size.

6. How to Choose the Right French Door Dimensions

The best dimensions depend on the available opening, intended use, traffic patterns, and the product system.

Consider the Available Wall Opening

Start with the actual opening and the manufacturer’s unit dimensions. A wider door is not automatically better if the surrounding wall cannot accommodate it or the installation would require extensive structural changes.

For new construction, coordinate the door dimensions with the architectural drawings and framing layout before the opening is built.

Think About Clear Passage Width

Consider how people will move through the doorway and whether furniture, equipment, or other large items need to pass through.

For double doors, the usable opening depends on the actual panel dimensions, frame, center meeting arrangement, and how many panels can open.

Where accessibility requirements apply, verify the required clear width under the applicable code and the actual installed configuration.

Match the Door to Its Application

Interior French doors may prioritize visual separation, natural light, and privacy. Exterior French doors also need to address weather exposure, security, and thermal performance.

Choose a door designed for the intended application instead of selecting solely by nominal dimensions.

Account for Ceiling Height and Architectural Proportions

Taller doors can complement rooms with high ceilings and larger openings. Standard-height configurations may be more practical for typical existing openings.

Consider the relationship between the door height, adjacent windows, ceiling height, trim, and overall room proportions before selecting a custom size.

Check Swing Direction and Operating Space

Hinged French doors require enough space for the panels to open without hitting furniture, walls, railings, or other obstructions.

Confirm whether the doors will swing inward or outward and whether both panels need to operate independently. The configuration can influence how the opening functions in everyday use.

7. When Should You Choose Custom French Door Sizes?

Standard dimensions are convenient when they match the opening and project requirements. Custom sizes may be appropriate when a building has nonstandard dimensions or the design calls for a particular configuration.

Consider a custom solution when:

• The existing opening does not match the available standard units.
• The design requires a taller or wider door configuration.
• The project needs a specific panel arrangement or frame depth.
• The door must coordinate with adjacent windows or architectural features.
• Standard product dimensions cannot meet the required functional or design criteria.

Custom dimensions should be confirmed with the manufacturer before the opening is finalized. Depending on the product, customization may affect fabrication lead times, hardware options, glazing choices, and installation requirements.

For replacement projects, compare the cost and complexity of modifying the opening with the cost and availability of a custom door unit.

8. FAQs

What are the standard dimensions of French doors?

Common nominal heights in the US market include 80, 84, and 96 inches. Double-door configurations may have nominal overall widths such as 60 or 72 inches, along with other options. Exact availability varies by manufacturer and product series.

How wide are standard double French doors?

Common configurations include nominal overall widths of 60 and 72 inches, with wider and narrower options available. For a pair of equal panels, these widths correspond to nominal panel widths of approximately 30 and 36 inches, respectively. Actual slab and frame dimensions must be confirmed with the product specifications.

What is the rough opening for a 72 x 80 French door?

The correct rough opening depends on what the 72 x 80-inch designation represents and the dimensions of the selected door unit. If it refers to a nominal door configuration, the complete unit may have different outside dimensions. Check the manufacturer’s installation documentation for the required rough opening width and height.

Are French doors available in 96-inch heights?

Yes, some French door product lines offer 96-inch nominal heights. Availability depends on the manufacturer, material, configuration, and intended application. Verify the actual unit dimensions and any additional structural or installation requirements before specifying a taller door.

Are interior and exterior French doors the same size?

They may share common nominal heights and widths, but they are not necessarily interchangeable. Exterior units must be designed for outdoor exposure and may have different frames, thresholds, glazing, sealing systems, and performance requirements.

Can French doors be made to a custom size?

Many manufacturers offer custom configurations or dimensions, subject to product limitations. Custom sizing is useful when an opening does not match available standard units, but the dimensions and installation details should be confirmed before production.

How do I know whether my French door opening is large enough?

Measure the opening width and height at multiple locations, check its squareness and level, and compare the results with the selected unit’s actual dimensions and rough opening requirements. If the opening is irregular or requires structural modification, have it assessed before ordering.

Conclusion

The right French door dimensions depend on the door configuration, actual unit size, available opening, and intended application. Before ordering, distinguish the panel dimensions from the complete unit and rough opening, then verify all measurements against the manufacturer’s specifications.

For nonstandard openings or specific design requirements, confirming the dimensions with your door supplier before production can help prevent fit problems and unnecessary modifications.

If you are looking for standard or custom French doors, Delanshini Doors and Windows offers a wide range of residential and commercial door solutions. For detailed specifications and quotations, please contact: wang@gddlsn.com