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Your Trusted Partner for Premium Windows & Doors in London
Established as a leading manufacturer and trader of premium window frames, doors, conservatories, and roof lanterns, R J Windows & Construction has built a reputation for delivering quality products at competitive prices. Our commitment to honesty and integrity has positioned us as trusted suppliers across London, serving both residential and commercial clients. Specialising in uPVC and aluminium systems, we combine modern design with durable materials to create energy-efficient solutions that enhance property value and security. Our team of experts ensures precision-tailored installations, from contemporary front doors to bespoke conservatory designs. With approved manufacturer status for Schuco Aluminium Systems, we prioritise thermal efficiency and aesthetic appeal, helping homeowners reduce energy bills while achieving architectural sophistication.

Whether upgrading a single-glazed window or transforming commercial spaces, our comprehensive range caters to diverse style preferences. We operate with transparency, offering clear pricing and dedicated support throughout the project lifecycle. Our working hours reflect our commitment to accessibility, with extended availability on weekdays and Saturdays. As a locally rooted business, we understand the unique demands of London properties and deliver solutions that balance functionality with visual impact. Backed by industry certifications and a focus on sustainability, we continue to innovate while maintaining the highest standards of craftsmanship.
Services
UPVC Bifold Doors Aluminium Windows Conservatory Roofs Roof Lanterns Composite Front Doors Contemporary Doors Sliding Door Systems Sash Windows Commercial Building Components Bespoke Installations
Highlights and features
  • We offer certified Schuco Aluminium System installations for superior durability
  • Our energy-efficient designs reduce annual heating costs by up to 190
  • Bespoke solutions tailored to residential and commercial property requirements
  • Approved manufacturers with expertise in modern uPVC and aluminium systems
  • Dedicated support from consultation through to precision installation
Associations and certifications
  • Schuco
Services
UPVC Bifold Doors
Our uPVC bifold doors combine slim sightlines with enhanced thermal efficiency. The interlocking trim system ensures seamless integration between panels while allowing maximum natural light transmission. Ideal for creating seamless indoor-outdoor transitions in residential properties across London.
Aluminium Systems
Schuco-approved aluminium solutions deliver durable, low-maintenance frames for windows and doors. These recyclable systems offer contemporary aesthetics with improved security features, suitable for both modern residential extensions and commercial buildings throughout London.
Conservatory Roofs
Global conservatory systems featuring Edwardian, Victorian, and P-shaped designs maximise usable space. Our insulated roof solutions maintain comfortable temperatures year-round while enhancing property value through premium glazing technology.
Roof Lanterns
Aluminium-framed roof lanterns flood interiors with natural light while reducing electricity costs. These energy-efficient installations feature weather-resistant seals and thermal breaks to maintain comfortable indoor temperatures throughout seasonal changes.
Composite Doors
Contemporary composite front doors combine GRP weather-resistant finishes with advanced locking systems. Available in wood-effect and white finishes, these high-security entrances feature reinforced frames and fire-resistant options for enhanced property protection.
Questions
What materials do you use for window frames?
We use uPVC and aluminium systems certified for durability and thermal efficiency.
Can you install conservatories in London properties?
Yes, we offer Edwardian, Victorian, and custom conservatory designs tailored to London homes.
Are your front doors secure?
Our composite doors feature reinforced locks and GRP finishes for maximum security.
Do you provide energy-efficient solutions?
All installations improve thermal performance, potentially saving £190 annually on energy bills.
What commercial services do you offer?
We supply and install aluminium and uPVC components for commercial buildings across London.
How can I get a quote?
Contact us via phone or email to discuss requirements and receive a detailed quotation.