What to Know Before Buying Double French Doors
If you are sourcing doors for a residential project, a commercial build, or a renovation, double French doors are a specific product category with distinct specification requirements. They are a pair of hinged door panels, each fitted with glass panes, that meet in the center when closed. They are used for exterior entrances, interior room dividers, and closet openings. The primary appeal is the combination of a wide, unobstructed opening and the natural light the glass panels admit.
Before you commit to a specification, understand this: double French doors are not a single product. They vary significantly in material, glass configuration, hardware, and intended application. The door that works for a climate-controlled interior hallway is not the same door you should specify for a coastal exterior exposure. The decision framework below covers the key variables so you can match the product to the project.
Types of Double French Doors: Exterior, Interior, and Closet
The application determines the performance requirements. Do not select a door based on appearance alone.
Exterior double French doors must handle weather, security, and thermal performance. They require weatherstripping, multi-point locking systems, and insulated glass. The frames need to be structurally rigid to resist wind load and prevent water infiltration. For exterior use, the door’s air-tightness and water-tightness ratings are critical specification points, not optional extras.
Interior double French doors have a simpler job. They do not need to resist weather, so the glass can be single-pane, the frames lighter, and the hardware less complex. Their main functions are space division, light transmission, and acoustic separation. Because they are not exposed to the elements, interior units can use materials that would not survive exterior conditions, such as certain engineered wood products or lighter aluminum extrusions.
Double French closet doors are the lightest-duty application. They are typically installed on tracks or as hinged pairs in front of a closet recess. They are primarily a visual feature. The main specification concerns are the width of the opening, the swing direction (do you want them to open into the room or slide?), and whether you need louvered panels for ventilation in addition to glass.
Glass and Glazing: Double Pane and Beyond
For exterior doors, the glass is the largest surface area of the unit, and it is where most heat loss and gain occur.
Double pane glass (also called insulated glass or IGUs) consists of two panes of glass separated by a spacer and sealed to create an air gap. This gap, often filled with argon gas, reduces heat transfer. When you see a U-factor or R-value cited for a door, the glass specification is the primary driver of that number. For exterior double French doors in most climates, double pane glass is the baseline specification, not an upgrade.
Tempered glass is a safety requirement. Building codes in most jurisdictions require tempered (or laminated) glass in doors and adjacent sidelites because it breaks into small granules rather than sharp shards. This is a code compliance issue, not a preference. Check the local building code for your project’s jurisdiction.
Low-E coatings are a further refinement. A microscopically thin metallic coating reflects infrared heat while admitting visible light. This improves energy efficiency without darkening the glass. For south-facing or west-facing exterior installations, a low-E coating with a specific Solar Heat Gain Coefficient (SHGC) is worth specifying.
For interior and closet doors, single-pane glass is usually adequate. If the interior door is between a home office and a living area, consider acoustic-rated laminated glass for sound reduction.
Material Showdown: Wood vs. Aluminum vs. uPVC
The frame material determines the door’s structural performance, maintenance profile, and aesthetic range.
Wood double French doors are the traditional choice. They offer a warm, classic appearance and can be painted or stained to match any interior or exterior scheme. They are also a good insulator by nature. The trade-offs are maintenance and dimensional stability. Exterior wood doors require periodic refinishing, and they can warp or swell with humidity changes. For exterior use, specify a stable species or an engineered wood core with a wood veneer. For interior and closet use, wood is an excellent choice with minimal downsides.
Aluminum double French doors are the engineering choice. Aluminum extrusions are strong, allowing for slimmer frames and larger glass areas. They do not warp, rot, or require painting. The critical specification for aluminum is the thermal break — a polyamide strip that separates the interior and exterior metal surfaces. Without a thermal break, aluminum conducts heat readily, making the door cold to the touch in winter and inefficient. With a thermal break, aluminum doors perform well in demanding climates. They are the best choice for large exterior openings where structural rigidity and slim sightlines matter.
uPVC double French doors are a cost-effective option, common in residential markets. They offer good thermal performance and require minimal maintenance. The trade-off is structural strength and appearance. uPVC frames are bulkier than aluminum, and they are not suitable for very large openings without steel reinforcement. They are a practical choice for standard-sized exterior openings in moderate climates.
Double French Doors Comparison Table
| Type | Material | Glass | Best Use |
|---|---|---|---|
| Exterior entrance | Aluminum thermal break | Double pane, tempered, low-E | Main entry or patio access in extreme climates |
| Exterior entrance | Wood (engineered core) | Double pane, tempered | Traditional homes, moderate climates |
| Exterior entrance | uPVC | Double pane, tempered | Cost-sensitive residential projects |
| Interior room divider | Wood | Single pane, clear or frosted | Home office, dining room, living areas |
| Interior room divider | Aluminum (non-thermal) | Single pane | Modern interiors, wide openings |
| Closet | Wood | Single pane or louvered | Bedrooms, dressing rooms |
| Closet | Aluminum | Single pane | Contemporary, slim-frame aesthetic |
How to Choose the Right Double French Doors for Your Project
Work through these decision criteria in order.
1. Determine the rough opening. The rough opening is the framed hole in the wall. It must be larger than the door unit itself to allow for shimming and leveling. A standard double door unit is typically 60, 64, or 72 inches wide, but the actual dimensions depend on the manufacturer and the frame profile. Measure the rough opening width and height first. The door unit must fit within those dimensions with a small gap (typically ½ inch) on each side and at the top. The critical rule: order the door to the rough opening, not the other way around.
2. Establish the swing direction. Decide whether the doors swing inward or outward. For exterior doors, outward swing is often preferred for weather resistance, but it requires clearance on the exterior. Inward swing is more common for interior doors. Check egress requirements — building codes typically require that a door can be opened from the inside without a key and that the clear opening width meets minimum standards for emergency exit.
3. Assess the climate and exposure. For exterior doors, consider the wind load, rain exposure, and temperature range. Coastal and high-wind areas require doors with higher structural ratings. Cold climates require thermally broken frames and low-U-factor glass. Hot climates require low-SHGC glass to reduce cooling loads.
4. Define the security requirements. Exterior double French doors are a common entry point for burglars because the two panels meet in the center. Specify multi-point locking systems that secure the door at multiple points along the frame, not just at the handle. Hinges should be heavy-duty and non-removable from the exterior.
5. Calculate the budget. The cost of double French doors is driven by material, glass specification, hardware, and labor. Wood is generally the most expensive material, followed by aluminum with thermal break, then uPVC. Double pane glass adds cost over single pane. Multi-point locks add cost over simple latch sets. Installation labor varies by region and by whether the door is pre-hung (comes with a frame) or a slab (door only). Get quotes for the complete installed cost, not just the door unit price.
6. Plan for maintenance. Wood exterior doors require refinishing every few years. Aluminum and uPVC require only cleaning of the frames and lubrication of the hardware. Interior wood doors require minimal maintenance. Choose the material based on the owner’s willingness to perform upkeep.
Frequently Asked Questions About Double French Doors
What is the standard size for double French doors?
Common widths for double French door units are 60, 64, and 72 inches, with heights of 80 or 96 inches. However, manufacturers offer custom sizes, and the actual unit dimensions vary with the frame profile. Always measure the rough opening before ordering.
What is the difference between French doors and sliding doors?
French doors are hinged and open outward or inward from the center. Sliding doors move horizontally on a track. French doors provide a fully open opening but require swing clearance. Sliding doors do not require swing clearance but leave one panel fixed, so the opening is only half the total width.
How much do double French doors cost?
Cost varies widely by material, glass, hardware, and size. uPVC units are at the lower end, wood at the higher end, with thermally broken aluminum in between. Double pane glass, low-E coatings, and multi-point locks all add cost. Get itemized quotes from suppliers for a specific project.
What is the rough opening for double French doors?
The rough opening must be about ½ inch larger than the door unit’s width and height on each side. For a 60-inch door unit, the rough opening should be approximately 61 inches wide. The exact dimension depends on the manufacturer’s specifications and the frame profile.
Can double French doors be used for a closet?
Yes. Double French closet doors are a common application. They are typically lighter in construction than exterior doors and can be hinged or installed on a track. The main considerations are the opening width and whether you need ventilation.
Additional Considerations: Customization and Supplier Selection
Beyond the standard product categories, several specification points can affect the final result.
Double pane French doors are worth specifying even for some interior applications if the door separates a conditioned space from an unconditioned one, such as a garage or an attic conversion. The insulating benefit is the same as for exterior doors.
Double door French doors — the term is often used interchangeably with double French doors, but it can also refer to any pair of hinged doors. When sourcing, confirm the exact configuration: are both panels operable, or is one panel fixed? Some installations use one fixed panel and one operable panel to reduce cost, but this changes the opening width.
Custom sizing is common in this product category. Standard sizes do not always fit existing openings, especially in renovations. A manufacturer that can produce doors to your exact rough opening dimensions, rather than forcing you to adjust the framing, simplifies the installation.
Hardware selection is a functional decision, not just an aesthetic one. For exterior doors, choose a multi-point lock with a high security rating. For interior and closet doors, the hardware is lighter duty, but the finish should match the room’s design.
When evaluating suppliers, focus on their ability to meet your specification, not on their marketing claims. Ask for the specific performance data: air-tightness, water-tightness, and wind load resistance for exterior doors. Ask about the glass specification, including the U-factor and SHGC. Ask about the frame construction and whether it includes a thermal break. Ask about lead time and whether they can handle your order volume.
As a manufacturer of solid wood doors, thermal-break aluminum doors, and system windows, we approach double French doors as an engineered product, not a commodity. Our factory produces doors to the customer’s specified dimensions, with the glass configuration and hardware that match the project’s requirements. We test our exterior doors for air-tightness, water-tightness, and wind resistance before shipment, and we can provide the packing list, proforma invoice, and customs documentation needed for international orders. Our profile structures and fittings can be adjusted to match local building codes in your target market.
If you need a specific size, a particular glass specification, or a custom hardware configuration, send us your project details. We can supply the product that fits your opening and your performance requirements.
