Business Details
Your Trusted Window & Door Installer in Harpenden
Harpenden Windows has been a trusted name in double glazing for over 40 years, specialising in high-quality uPVC and aluminium windows, doors, and roofline products. As a family-run business based in Hertfordshire, we combine decades of industry expertise with a commitment to ethical trading and customer satisfaction. Our products are manufactured in-house at our Harpenden factory, ensuring precision and adherence to the highest standards of thermal efficiency and security. Backed by FENSA registration and CE marking, we offer tailored solutions for both traditional and contemporary properties, with a focus on energy-rated systems that enhance home comfort.Our reputation, built on over 90% of work coming via recommendations, reflects our dedication to transparency, competitive pricing, and comprehensive guarantees. With our own experienced fitting teams and a free no-obligation quotation service, we prioritise reliability, professionalism, and long-term client relationships, ensuring every project meets exact specifications and exceeds expectations.
Services
Bi-Fold Doors
Flush Casement Windows
Patio Doors
Lantern Roofs
Residence Collection
Highlights and features
- 40 Years of successful trading
- Family run local business
- FENSA Registered
- Over 90% of our work is via recommendation
- Comprehensive Product Guarantees
Associations and certifications
- FENSA
- CE Marking
Services
Bi-Fold Doors
Our bi-fold doors seamlessly connect indoor and outdoor spaces with sleek, durable aluminium frames. Designed for maximum light and thermal efficiency, they feature low thresholds, multi-point locking systems, and a choice of configurations. Ideal for modern or traditional homes, they enhance aesthetics while offering exceptional security and minimal maintenance.
Flush Casement Windows
These uPVC flush casement windows replicate the look of traditional timber frames with modern energy-efficient technology. Available in custom colours and finishes, they include night vents, patented weatherseals, and A+ energy ratings. Perfect for period properties seeking improved insulation without compromising on style.
Lantern Roofs
Lantern rooflights flood interiors with natural light, combining contemporary design with durability. Available in bespoke sizes and colours, they feature advanced double glazing, acoustic insulation, and low-maintenance materials. Ideal for flat roofs, they add architectural flair and increase property value through enhanced daylighting.
Patio Doors
Reynaers aluminium patio doors offer slim sightlines, effortless operation, and superior security. Their stainless steel tracks ensure smooth sliding, while double or triple glazing achieves U-values as low as 1.1W/mK. Customisable in colour and configuration, they provide a seamless transition between living areas and gardens.
Residence Collection
The Residence Collection combines luxury timber aesthetics with uPVC durability. These flush casement windows and doors feature maintenance-free profiles, A++ energy ratings, and a wide range of finishes. Engineered in-house, they deliver timeless elegance and enhanced security for both new builds and heritage properties.
Questions
What areas do you serve?
We operate across Hertfordshire and surrounding areas, including Harpenden, Watford, and local Hertfordshire regions.
Are your products energy efficient?
Yes, all our windows and doors have A+ energy ratings, with U-values as low as 1.1W/m²K for optimal thermal performance.
Do you offer guarantees?
We provide comprehensive guarantees covering both products and installations, ensuring long-term peace of mind.
Are you FENSA registered?
Yes, we are a FENSA-accredited installer, meeting strict standards for workmanship and customer service.
Can I get a free quote?
Yes, we offer free, no-obligation quotations with expert advice tailored to your property's needs.
