DuraJoin supplies and installs custom-built external French doors across London, Hitchin, and nearby areas. Every unit is made to fit your space, finished to your specification, and installed by our in-house team.
External French doors are supplied and installed across London, Hitchin, and surrounding areas with full project handling from survey to completion. Each unit is built to order using precise measurements and tailored specifications.
Available in aluminium or timber frames, with a wide range of RAL colours including dual-finish options. Choose between open-in or open-out configurations to suit the layout of your home or extension. Glazing can be double or triple, with upgrades available for solar control, acoustic insulation, or laminated safety glass.
Designed to fit both period and modern properties, these doors complement kitchen extensions, garden rooms, and full refurbishments. Structural preparation is included if required, ensuring doors are properly supported and sealed.
Installation is carried out by an experienced in-house team. No subcontractors. Site is left clean and ready to use. Lead times typically range from 2 to 3 weeks, depending on spec. Most fitting work is completed within a day.
Everything is managed in-house to ensure quality, compliance, and a seamless handover. From first measurements to final clean-up, the service is built for reliability and precision.
Choosing a supplier for external French doors is not just about looks or price. You need long-term durability, proper installation, and full compliance with building standards. DuraJoin provides an end-to-end service backed by in-house expertise, custom manufacturing, and a strong reputation across London, Hitchin, and surrounding regions.
Tailored Manufacturing for Every Opening
Each French door set is made to order and built precisely to fit your structural opening. We don’t work with off-the-shelf units or pre-set dimensions. That means your doors will not just look right; they will function perfectly, with proper tolerances, sealing, and alignment.
Designed to Match Any Property Style
We offer slimline aluminium profiles for a sleek modern finish or timber-framed options for heritage projects. Glazing bar layouts, sightlines, and handle types are all configurable. You can choose traditional proportions or contemporary clean lines, depending on your home’s architecture.
Colour-Matched to Existing Windows and Doors
Your doors will not stand out for the wrong reasons. We colour-match to any RAL code and offer dual-colour finishes for inside and outside contrast. The powder coating we use is weatherproof, UV-resistant, and long-lasting with minimal upkeep.
Security and Thermal Performance Built In
All doors include multi-point locking systems, secure internal glazing beads, and reinforced hinges. We offer toughened, laminated, and triple glazing options for those needing higher security and energy performance. Frames are thermally broken to prevent cold bridging.
Installed by Our In-House Team
We never outsource installation. Our team handles everything from prep to sealing and finishing. This means one point of contact, full accountability, and no miscommunication between manufacturers and fitters.
Planning and Building Control Awareness
We have hands-on experience with planning policies across boroughs in London and Hertfordshire. If your project is in a conservation area or part of a listed building, we can help you choose suitable styles and provide drawings or specs as needed.
Trusted by Professionals and Homeowners Alike
We work regularly with private clients, developers, architects, and contractors. Whether it’s a single door set for a home or multiple installs for a new development, our team delivers with consistency and clarity.
External French doors are available in thermally broken aluminium or traditional timber, both built for strength, insulation, and long-term performance. Aluminium offers a clean, slim profile suited to modern homes, while timber delivers the character and authenticity needed for heritage properties.
All units can be finished in any RAL colour. Dual-colour options are also available, allowing for a different interior and exterior tone. This ensures the doors complement your existing window frames or overall design. Coatings are applied in the factory for maximum durability and weather resistance.
Glazing is tailored to your needs. You can choose from toughened, laminated, or triple glazing depending on your security and insulation requirements. For heat control and privacy, solar control and frosted glass options are also available. Every unit is internally glazed to meet security standards.
Doors can open inward or outward, depending on the layout of your room or garden. Optional glazed sidelights provide additional natural light and can be built into one or both sides of the frame. For a smooth threshold, we also offer step-free options and integrated drainage solutions, ensuring functionality without compromising appearance or performance. All details are reviewed before manufacture to guarantee precision.
We follow a precise, professional process to ensure every external French door installation is completed correctly, without delays or shortcuts. From the first measurement to the final seal, every step is managed in-house.
Site Survey
We begin with a local site visit. A member of our team visits your property in London, Hitchin, or nearby to confirm your existing opening or proposed location. We take accurate measurements, assess the structure, check for drainage or threshold requirements, and gather all the technical details needed for manufacture. If you’re working on an extension or full renovation, we coordinate with your builder or contractor at this stage.
Design and Quote
Once measurements are confirmed, we prepare a full specification quote. If needed, we provide CAD drawings or elevation visuals to show layout, proportions, or glass configurations. Your quote includes everything: frames, glazing, hardware, delivery, fitting, and finishing. You’ll know exactly what’s included and what to expect.
Manufacture
After you approve the quote and sign off on your specification, we begin manufacture. Each door is built to order. The selected frame material, colour finish, glazing type, and hardware are prepared in line with your brief. You’ll be updated with estimated lead times and delivery dates as the unit is fabricated.
Install
On the agreed date, the finished French doors are delivered directly to your site. Installation is carried out by our in-house team. No subcontractors. We manage removal of any existing frames, preparation of the opening if needed, and complete fitting with full weather sealing. All trims, thresholds, and finishing work are completed on the same day or the following day depending on site conditions. Our team leaves the space clean and ready for use.
Aftercare and Warranty
Every installation comes with a product and installation guarantee. We offer optional annual checks if you’d like scheduled aftercare, and we’re available locally should you need future adjustments or advice.
We follow a precise, professional process to ensure every external French door installation is completed correctly, without delays or shortcuts. From the first measurement to the final seal, every step is managed in-house.
Site Survey
We begin with a local site visit. A member of our team visits your property in London, Hitchin, or nearby to confirm your existing opening or proposed location. We take accurate measurements, assess the structure, check for drainage or threshold requirements, and gather all the technical details needed for manufacture. If you’re working on an extension or full renovation, we coordinate with your builder or contractor at this stage.
Design and Quote
Once measurements are confirmed, we prepare a full specification quote. If needed, we provide CAD drawings or elevation visuals to show layout, proportions, or glass configurations. Your quote includes everything: frames, glazing, hardware, delivery, fitting, and finishing. You’ll know exactly what’s included and what to expect.
Manufacture
After you approve the quote and sign off on your specification, we begin manufacture. Each door is built to order. The selected frame material, colour finish, glazing type, and hardware are prepared in line with your brief. You’ll be updated with estimated lead times and delivery dates as the unit is fabricated.
Install
On the agreed date, the finished French doors are delivered directly to your site. Installation is carried out by our in-house team. No subcontractors. We manage removal of any existing frames, preparation of the opening if needed, and complete fitting with full weather sealing. All trims, thresholds, and finishing work are completed on the same day or the following day depending on site conditions. Our team leaves the space clean and ready for use.
Aftercare and Warranty
Every installation comes with a product and installation guarantee. We offer optional annual checks if you’d like scheduled aftercare, and we’re available locally should you need future adjustments or advice.
We are not only diligent in our work, but we also pay attention to our team and customers. We follow a safe and secure manufacturing process till the post-instalment support and maintenance. We provide FENSA or CERTASS certification on request.
Durajoin customer success is defined by our product’s quality. We follow the best standards and raise the bar to provide you with the desired result.
Durajoin is exemplary when it comes to integrity. We maintain high standards of confidentiality to maintain the best possible relationship with our customers.
We supply and install external French doors across Greater London and Hertfordshire, including North London, West London, and Hitchin. Our team regularly works on projects involving listed buildings, kitchen extensions, and modern new builds.
We understand local planning and building regulations, particularly in boroughs like Camden, Islington, Barnet, and Hitchin District. That means faster site visits, accurate estimates, and smooth approvals. Whether you’re upgrading an existing opening or planning a full extension, we ensure every door is built and fitted to the correct standard.
Being as windows fabricator allow us to offer affordable pricing
We take pride in our expertise to provide the best solutions.
Your wait end here! We offer manufacturing, delivery, and installation on time.
We source high-quality profile for our customers from SMART System, Cortizo, schüco etc.
Yes. We can replace outdated or damaged French doors with modern, high-performance units. The opening is assessed during our site survey to ensure proper fit, drainage, and structural support. Whether timber or aluminium, your new doors will meet today’s standards for insulation, security, and appearance.
In most cases, planning permission is not required. Replacing doors on the rear of a property usually falls under Permitted Development. However, if your home is listed, in a conservation area, or part of a flat conversion, we will advise on what approvals may be needed before work begins.
Yes. Our French doors can be configured to open either inward or outward, depending on your layout and preference. We’ll confirm the best option during your site visit, taking into account available space, furniture placement, and garden access.
All doors include multi-point locking systems and toughened or laminated glazing as standard. Optional upgrades are available for Secured by Design compliance. Every unit is built and installed to meet UK safety and security regulations for residential properties.
Yes. We can colour-match your French doors to any RAL shade, including dual-finish options for interior and exterior contrast. Frame profiles can also be selected to closely align with your existing window sightlines and style.
Lead times typically range from 2 to 4 weeks from order to install, depending on your chosen material, glass spec, and finish. Installation usually takes one day. We’ll confirm exact timelines during your quote and keep you updated throughout the process.
We offer quotes with or without a site visit. You can send across rough dimensions or architectural plans, and we’ll provide a full breakdown including glass, finish, installation, and aftercare.
If you’re based in London, Hitchin, or anywhere in Hertfordshire, we can typically schedule a site visit within 2 to 3 working days.
All quotes are handled by our in-house team. There are no delays, no guesswork, just accurate pricing and clear next steps.
Call: 020 3576 2142
Email: [email protected]
Or use the contact form for a fast estimate.
Durajoin proudly provides aluminium windows and doors installation across Greater London, serving homeowners and businesses in West London, East London, South London and North London. Our expert team delivers bespoke window and door solutions tailored to each property and local architectural style.
Durajoin partners with some of the leading window and door system manufacturers to ensure every product we supply meets the highest standards of quality, durability and performance. By working with trusted industry brands, we are able to offer premium aluminium windows, doors and glazing systems that combine modern design, energy efficiency and long-lasting reliability. These partnerships allow us to deliver high-quality solutions for homes, commercial properties and architectural projects across London.
If you are planning to upgrade your home with high-quality casement windows in London, Durajoin offers expert advice and bespoke window solutions tailored to your needs.
Call us now: 0203-576-2142 or Request a free quote online
Affordable
10-year Guarantee
Made in Britain
Trade Supply