Business Details
37 Years
experience
Your Trusted Partner for High-Quality Windows & Doors in Watford
Established in 1989, Harp Windows is a family-run business with over 35 years of expertise in manufacturing and installing high-quality replacement windows, doors, and conservatories. Our commitment to professional integrity, efficient customer service, and value for money has earned us a strong reputation in Watford and surrounding regions. We prioritise customer satisfaction, offering fully guaranteed products, a dedicated after-sales service, and flexible showroom appointments to ensure a seamless experience.Accredited by Which? Trusted Trader, FENSA, and the Consumer Protection Association, we combine traditional craftsmanship with modern innovation to deliver durable, energy-efficient solutions. Our local knowledge extends across Hertfordshire, Buckinghamshire, Middlesex, and North London, serving homeowners with tailored consultations and installations.
Services
Replacement Windows
Composite Doors
Conservatories
Bi-Folding Doors
Sliding Sash Windows
Details
- Year established: 1989
Highlights and features
- 36 years of experience in window and door installation
- FENSA registered with a 10-year product guarantee
- Award-winning after-sales service for complete peace of mind
- Showroom in Watford for hands-on product demonstrations
- Fully endorsed by Which? Trusted Trader and Checkatrade
Associations and certifications
- Which? Trusted Trader
- FENSA
- Consumer Protection Association
What people say
Fantastic service
Excellent service
Quality window
No fuss
Highly recommend
Services
Replacement Windows
We manufacture and install energy-efficient replacement windows in materials like uPVC, aluminium, and engineered timber. Our casement and sliding sash designs combine security, style, and thermal performance to enhance home comfort. With a 10-year guarantee, our windows are tailored to meet modern standards while maintaining traditional aesthetics in period properties and contemporary homes.
Composite Doors
Our high-specification composite doors offer superior security, insulation, and visual appeal with options in uPVC, timber alternative, and aluminium. Designed to complement any property, these doors feature advanced locking systems and durable finishes. Customisation ensures a perfect match for architectural styles, from classic to modern, backed by professional installation and after-sales support.
Conservatories
Transform your space with our bespoke conservatories, blending functionality and elegance. Using premium materials, we create light-filled extensions ideal for living or dining areas. Each project includes a dedicated design consultation, ensuring structural integrity and energy efficiency. Our skilled team handles every stage, from planning to completion, minimising disruption while maximising value.
Bi-Folding Doors
Enhance indoor-outdoor living with our market-leading bi-folding and sliding patio doors. These systems provide seamless transitions between spaces, featuring low thresholds and expansive glass panels for unobstructed views. Engineered for durability and ease of operation, our doors are available in custom sizes and finishes, installed by experienced professionals for a flawless finish.
Timber Alternative Windows
Our Evolution timber replacement windows replicate the classic look of wood with low-maintenance uPVC profiles, offering thermal efficiency and resistance to warping. Traditional internal aesthetics are preserved alongside modern benefits like noise reduction and enhanced security. Designed for homeowners seeking heritage charm without compromise, these windows are precision-engineered and expertly fitted.
Questions
Where does Harp Windows operate?
We serve Watford, St Albans, Harrow, Pinner, Northwood, Hemel Hempstead, and across Hertfordshire, Buckinghamshire, Middlesex, and North London.
Do you offer guarantees on installations?
All products include a 10-year guarantee, backed by guarantee protection insurance for added security.
Can I visit your showroom?
Our Watford showroom is open Mon-Fri 10am–3pm and Sat 10am–2:30pm, by appointment only.
How long does installation take?
Most projects, like single window replacements, are completed within six weeks, with urgent cases prioritised.
Are your installers certified?
We are FENSA registered and endorsed by Which? Trusted Trader, ensuring compliance with industry standards.
Do you offer after-sales support?
Our dedicated service engineer provides rapid response, typically within 1-2 hours for urgent issues.
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