French doors are a timeless design feature that add elegance, natural light, and a seamless connection between indoor and outdoor living areas. But while their aesthetic appeal is undeniable, choosing the correct size is essential for functionality, insulation, and overall home harmony.
Whether you’re renovating a period property or installing a modern timber frame extension, understanding the standard and custom sizing options for French doors—alongside matching door frames, door knobs & timber wood doors—is key to achieving a polished result.
At WH Carden, we specialise in bespoke door solutions across the UK, offering made-to-measure custom exterior doors, durable door furniture, and premium timber wood products that combine style with longevity.
What Are French Doors?
French doors are traditionally double doors featuring large glass panes, often framed in wood, that swing outward or inward. Their symmetrical design, natural light flow, and versatility make them a popular choice for:
- Patios and gardens
- Balconies and terraces
- Interior living space dividers
- Conservatories and extensions
Unlike sliding doors, French doors require door frames that can handle the movement and sealing function effectively—especially important in the UK’s ever-changing climate.
Standard French Door Sizes in the UK
In the UK, standard French door sizes vary based on supplier, design, and function (internal vs. external). That said, there are some commonly accepted dimensions:
Typical Widths (Pair):
- 1,200mm (approx. 4 ft)
- 1,500mm (approx. 5 ft)
- 1,800mm (approx. 6 ft)
- 2,100mm (approx. 7 ft)
Typical Heights:
- 2,000mm (approx. 6 ft 6 in)
- 2,100mm (approx. 6 ft 10 in)
- Custom sizes often available for modern extensions or period homes.
For homes with high ceilings or wider openings, we recommend considering bespoke high-performance doors that offer insulation, security, and architectural integrity.
When to Choose Custom-Sized French Doors
Standard sizes may not always suit older UK homes or contemporary builds with non-standard openings. Here’s when you should go custom:
- Renovating a Georgian, Victorian, or Edwardian home
- Matching existing architectural features
- Installing doors into brick openings that differ from modular construction norms
- Adding French doors in place of a large window or bay opening
At WH Carden, we offer custom interior doors and custom exterior doors crafted to exact specifications, ensuring a seamless fit that aligns with your aesthetic and performance needs.
Understanding Door Frame Sizes
When selecting French doors, don’t forget the door frame—the unsung hero of your door system. A door frame supports the weight, enables proper alignment, and provides insulation. In most cases, your French door frame will add 30–60mm on all sides to your door leaf measurements.
For example:
If your total wall opening is 1,800mm x 2,100mm, your doors should likely be around 1,740mm wide and 2,040mm high, allowing for frame thickness and clearances.
To learn more about frame sizing, installation tips, and door maintenance, browse the WH Carden blog for expert advice.
Single vs. Double Door French Sets
French doors can be configured as:
Equal double doors: Classic symmetrical setup where both doors open.
One active, one fixed door: Ideal for smaller spaces needing occasional access through the second leaf.
With side panels: For wider openings or panoramic views.
No matter the setup, we recommend pairing your installation with high-quality door furniture, including hinges, handles, and door knobs that match the style and durability of your frame.
Interior French Door Sizes
While French doors are commonly associated with garden access, they also work beautifully inside the home—connecting living and dining rooms, opening into home offices, or dividing kitchens from conservatories.
Interior French doors are generally slimmer and lighter than exterior models, with standard widths starting at:
- 1,200mm for pairs (600mm per leaf)
- Up to 1,800mm or more for wider spaces
Browse our range of handcrafted custom interior doors designed to suit both traditional and contemporary interiors across the UK.
Glass Options for French Doors
Whether internal or external, the glass you choose for your French doors will impact not only aesthetics but also insulation and privacy.
Common options include:
- Double glazing for thermal performance
- Laminated glass for safety and noise reduction
- Obscured or frosted glass for bathrooms or private rooms
- Decorative leaded or stained-glass designs for heritage homes
If you’re looking for additional insulation and light control, pair your French doors with our high-performance windows for a unified design that enhances energy efficiency.
Door Knobs & Handles: Finishing in Style
When installing French doors, don’t overlook the importance of door knobs and furniture. Whether your taste leans towards traditional brass or modern chrome, quality ironmongery ensures longevity and complements the door’s finish.
Our collection of door furniture includes:
- Door knobs and handles
- Latches and locks
- Hinges and bolts
- Letter plates and escutcheons
Properly chosen door hardware not only enhances the look of your timber wood doors, but also plays a critical role in smooth operation and security.
What Timber Is Best for French Doors?
At WH Carden, we recommend hardwoods like European Oak or Accoya for exterior French doors due to their durability and resistance to UK weather conditions. For interiors, softer timbers such as Ash or Tulipwood provide a beautiful finish at a more economical price point.
Explore our wide selection of timber products for sustainable, kiln-dried, high-performance wood that meets all architectural and structural needs.
What About Outdoor Integration?
Installing French doors onto a patio or garden? Extend the beauty of your timber theme with decking timber. Our decking solutions complement your external doors perfectly and create a seamless flow from inside to out.
Final Checklist: Choosing the Right French Door Size
| Criteria | Standard Size Option | Custom Size Solution |
| Traditional patio opening | ✅ | ✔️ |
| Non-standard wall aperture | ❌ | ✔️ |
| Period property restoration | ❌ | ✔️ |
| Modern extension | ✅ | ✔️ |
| Glass type flexibility | ✅ | ✔️ |
| Energy efficiency upgrade | ✅ with insulation | ✔️ with high-performance doors |
Why Choose WH Carden for Your French Doors?
As a family-run British manufacturer, WH Carden combines traditional joinery craftsmanship with modern performance standards. Every timber door, frame, and accessory is bespoke and made to order, ensuring that your project gets the attention to detail it deserves.
We offer:
- Made-to-measure interior and exterior doors
- Classic and contemporary door knobs & furniture
- Kiln-dried, sustainably sourced timber
- Expert advice for home renovators, architects, and builders
- Nationwide delivery across the UK
Final Thoughts: Let Light In With Confidence
Installing French doors is more than just adding a feature—it’s about transforming the way your home feels and functions. Whether you’re working with standard sizes or need a custom solution, having the right partner is essential.
At WH Carden, we’re ready to help you find the perfect fit for your space, from precision-cut door frames to premium door knobs and timber wood doors.
Need expert sizing help? Reach out today.
Visit our blog for more joinery tips and door inspiration.