Standard French Door Width: What Buyers Need to Know

What Is the Standard French Door Width?

The standard width of French doors is 60 inches (5 feet) for a double-door unit, with common alternatives at 64, 68, and 72 inches. This measurement refers to the total opening width the pair of doors covers, not the width of each individual door panel. A 60-inch French door set, for instance, consists of two 30-inch door slabs that meet in the middle.

French doors are hinged pairs that open from the center. Unlike sliding doors, both panels swing—either inward or outward—which means the entire width must be clear for operation. When buyers ask about “French door width,” they typically mean one of three measurements: the door slab width (each panel), the unit width (including the frame), or the rough opening (the framed hole in the wall). These differ by several inches, and confusing them is the most common sourcing error.

For a 60-inch French door unit, expect the following approximate breakdown:

The frame adds roughly 1.5 to 2 inches total (split between both sides), and the rough opening needs an additional 0.5 to 1 inch for shims and leveling. These values vary by manufacturer and frame material, so always confirm with the door supplier before framing an opening.

French Door Width vs. Double Door Width: Key Differences

In standard construction, “double door” and “French door” are often used interchangeably, but they are not identical product categories. A standard double door refers to any pair of side-hinged doors. French doors are a specific subtype where the two panels meet at the center without a fixed center post (mullion). Both panels can be active, or one can be fixed with the other operating.

The width conventions, however, are similar. Standard double door width follows the same 60-to-72-inch range, based on the “36-inch module”—multiples of 3 inches that dominate residential stock sizes. This module matters because it aligns with common rough openings in wood-frame construction.

The practical difference lies in how the doors are used. French doors for interior passages (like a dining room or study) often use slimmer panels and may go as narrow as 48 inches total. Exterior French doors serving as a patio entry must meet egress requirements, which typically push them to 60 inches or wider. Standard double doors in commercial settings can be much wider—up to 96 inches—since they are not constrained by residential egress modules.

When specifying, clarify whether you need true French doors (no center post, both panels glazed) or simply a double door unit. The width options overlap, but the hardware, weatherstripping, and structural requirements differ.

Standard Widths for Interior and Exterior French Doors

Interior French Door Width

Interior French doors typically range from 48 to 72 inches total width. The most common interior sizes are:

• 48 inches (two 24-inch slabs)—fits narrow hallways and small closets
• 60 inches (two 30-inch slabs)—standard for larger closets and room dividers
• 64 inches (two 32-inch slabs)—common in newer construction with metric-based framing

Interior doors do not face weather or egress requirements, so width selection is driven by the opening size, traffic flow, and furniture movement. A 48-inch set works for a closet, but a passage between rooms should be at least 60 inches to allow two people to pass comfortably and to move furniture without angling.

Exterior French Door Width

Exterior French doors are almost always 60 inches or wider. The minimum practical width is driven by building codes that require a clear egress path in bedrooms and living areas. While local codes vary, the International Residential Code (IRC) generally requires a clear opening of at least 32 inches for egress in sleeping rooms. This translates to a minimum 60-inch double door unit when both panels are operable—a 30-inch slab provides barely enough clear width once the door swing is accounted for.

Common exterior widths are:

• 60 inches—minimum for code-compliant egress in most jurisdictions
• 64 inches—common where the rough opening already exists at this width
• 72 inches—preferred for patio access and spaces with heavy traffic

Exterior units also need to accommodate the frame depth for insulation and weatherstripping. A wider unit (72 inches) allows for a larger fixed panel and one operating panel, which improves energy performance by reducing the number of moving seals.

How to Measure French Door Width Correctly

Measuring for French doors requires three separate width readings, and skipping any of them leads to ill-fitting units. Use a steel tape measure and record to the nearest 1/8 inch.

Step 1: Measure the rough opening width. Remove any existing door trim or casing to expose the rough framing. Measure across the opening at three heights—top, middle, and bottom. Record the narrowest dimension. The rough opening should be 0.5 to 1 inch wider than the door unit’s actual width to allow for shims.

Step 2: Measure the unit width. If you are replacing an existing door, measure the outside edge of the current frame, not the door slab. This is the unit width you need to match. If the frame is not square (check with a level), note the diagonal difference—a variation of more than 1/4 inch means the opening needs correction before installation.

Step 3: Verify the door slab width. For each panel, measure from edge to edge across the widest point. Add both slabs together. This combined width will be about 1.5 to 2 inches narrower than the unit width, since each slab overlaps the frame by roughly 3/4 inch on the hinge side.

Common measurement mistakes include measuring only the door slab and assuming it equals the opening width, failing to account for out-of-plumb walls (which require trimming the slab, not the frame), and ignoring uneven floors that force a wider bottom gap and reduce effective clearance. If the existing opening is not perfectly square—which is common in older construction—the width specification should target the narrowest point, and the supplier should be informed of the variance.

Factors That Affect French Door Width Choices

Building Codes and Egress Requirements

For exterior French doors, local building codes dictate the minimum clear opening width. While the IRC’s 32-inch clear opening is a common baseline, some jurisdictions require more, especially for accessibility. Verify the local code before selecting a width—a 60-inch unit with two operating panels usually satisfies egress, but if one panel is fixed, the operating side must still provide the required clear width on its own.

Rough Opening Constraints

The existing rough opening is the single biggest constraint. Widening a rough opening means cutting into load-bearing framing, which requires engineering review and permits. Narrowing it means adding framing material and reducing the usable width. If your opening is, for example, 68 inches, you cannot simply order a 68-inch French door—you must select a unit width that fits within the opening with room for shims, or adjust the framing.

Panel Configuration

French doors can be configured with both panels operating, or with one fixed and one operating. Both-operating configurations need a wider swing clearance but allow the full width to open. Fixed-operating configurations reduce the active width but improve structural stability and energy efficiency. For a given total width, a fixed-operating pair can use wider fixed panels, which changes the visual proportion.

Accessibility and Furniture Movement

For public or commercial spaces, ADA accessibility guidelines require a minimum 32-inch clear passage width, which typically means a 36-inch door slab. Residential projects are not bound by ADA, but the same logic applies when planning for wheelchair access or moving large furniture. A 72-inch French door unit with two 36-inch slabs provides the most flexible clearance.

Common Questions About French Door Widths

What is the average width of French doors?
The average width for a double French door unit is 60 inches. This is the most commonly stocked size in both interior and exterior configurations. For interior closets, 48-inch units are also common, while exterior patio units frequently go up to 72 inches.

What is the typical width of double French doors?
Typical double French door widths are 60, 64, and 72 inches. The 60-inch size dominates residential applications. The 64-inch size is common in regions where metric-based framing is standard, and the 72-inch size is preferred for exterior applications where a wider passage is desired.

What is the standard double door width?
Standard double door width follows the same conventions as French doors: 60 inches for a typical residential pair, with 72 inches as the common larger option. In commercial construction, double doors can range from 72 to 96 inches, but residential stock sizes rarely exceed 72 inches.

How do interior and exterior French door widths differ?
Interior French doors can be as narrow as 48 inches since they face no weather or egress requirements. Exterior French doors are almost always 60 inches or wider because building codes require a minimum clear opening for emergency egress, and the door must accommodate weatherstripping and thermal breaks that add to the frame depth.

What is the width of a double door in standard construction?
In standard residential construction, a double door unit is 60 inches wide, consisting of two 30-inch slabs. The rough opening for this unit is approximately 62 to 63 inches. Larger standard options include 64-inch units (two 32-inch slabs) and 72-inch units (two 36-inch slabs).

Can French doors be made in non-standard widths?
Yes. French doors are available in custom widths from most manufacturers, though this increases cost and lead time. Custom widths are typically needed when replacing doors in older homes with non-standard openings or when matching existing architectural proportions. A custom width is measured the same way as a standard width—the only difference is that the manufacturer produces the frame and slabs to your exact specification.

Terms buyers should know

How to Choose Between Standard and Custom Widths

For most residential and light commercial projects, a standard width—60, 64, or 72 inches—is the right call. Standard widths are stocked by manufacturers and distributors, which means shorter lead times, lower cost, and easier replacement if a panel is damaged. They also align with common rough openings, so if you are building new, framing to a standard width avoids custom framing costs.

Choose a custom width when the existing rough opening is non-standard and cannot be economically modified, or when the architectural design requires specific proportions. Custom widths become necessary in renovations of older buildings where original openings were built to imperial measurements that do not match modern stock sizes, or where the opening was framed for a different door type (such as a sliding door) and the owner wants to convert to French doors without reframing.

A practical decision rule: if your rough opening is within 2 inches of a standard width, adjust the framing to fit the standard. If the difference exceeds 2 inches, or if the opening is load-bearing and cannot be altered, order a custom width. Custom French doors typically add 2 to 4 weeks to lead time and increase cost by 15 to 30 percent compared to stock sizes.

Sourcing French Doors at the Right Width

Once you have confirmed the width specification—whether standard or custom—the next step is selecting a manufacturer that can deliver to that dimension with the necessary structural performance. This is where the distinction between a factory and a trading company becomes relevant to your project.

As a manufacturer, we produce French doors and double door units in both standard widths (60, 64, 72 inches) and fully custom dimensions. Our approach to width specification starts with your rough opening measurements, not a catalog. We adjust the frame profile and panel configuration to match your opening while maintaining the air-tightness, water-tightness, and wind resistance performance required for exterior applications. For interior units, we focus on the swing clearance and hardware configuration that fit your traffic pattern.

We regularly supply French doors for projects where the opening does not match standard stock sizes—renovations, custom homes, and commercial retrofits. Because we control the manufacturing process directly, we can produce non-standard widths without the premium that distributors typically add for special orders. We also provide the full documentation package—packing lists, proforma invoices, and customs documents—that international buyers need for smooth delivery.

If your project requires a specific width that is not listed here, send us your rough opening dimensions and we will confirm the appropriate unit width for your installation method and building code requirements.

Get a Free Quote