Business Details
37 Years
experience
Emergency
services
Trusted Replacement Windows & Doors in Watford
Established in 1989, Harp Windows is a family-run business with over 35 years of experience 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 reputation as a trusted installer endorsed by Which? Trusted Trader and Hertfordshire Trading Standards. As a FENSA-registered company (10912), we provide a comprehensive aftersales service, including a 10-year product guarantee backed by insurance, ensuring complete peace of mind.Our team prioritises customer satisfaction, offering free consultations, competitive pricing, and installations across Hertfordshire, Buckinghamshire, Middlesex, and North London. With a showroom in Watford and a dedicated service engineer available for urgent issues, we combine technical expertise with old-fashioned friendly advice to deliver tailored solutions for every home.
Services
Replacement Windows
Doors
Conservatories
Sash Windows
Casement Windows
Composite Doors
Bi-folding Doors
Patio Doors
Timber Alternative Windows
Aluminium Windows
Details
- Year established: 1989
Highlights and features
- Which? Trusted Trader endorsement reflecting our commitment to customer satisfaction
- FENSA-registered company ensuring compliance with building regulations
- 10-year product guarantee with insurance-backed warranties for complete peace of mind
- Comprehensive aftersales service with rapid response times for urgent issues
- Over 35 years of experience serving Hertfordshire, Buckinghamshire, and North London
Associations and certifications
- Which? Trusted Trader
- FENSA
- Consumer Protection Association
- Checkatrade
What people say
Fantastic service
Excellent workmanship
Professional and polite
Quick installation
Highly recommend
Services
Replacement Windows
Our replacement windows combine advanced thermal efficiency with durable uPVC, aluminium, and engineered timber frames. Designed to enhance security and reduce energy bills, these windows offer modern functionality while preserving traditional aesthetics. Ideal for homeowners seeking long-term value and improved property comfort.
Composite Doors
High-specification composite doors provide superior security, weather resistance, and customisable designs. Available in uPVC, timber alternative, and aluminium finishes, these doors enhance kerb appeal while meeting modern insulation standards. Perfect for homeowners prioritising safety and style.
Bi-folding Doors
Market-leading bi-folding doors create seamless transitions between indoor and outdoor spaces. Featuring slim aluminium frames and expansive glass panels, they maximise natural light and offer smooth operation. Suitable for contemporary home extensions and conservatories.
Sash Windows
Our sash windows replicate traditional timber aesthetics with modern uPVC or timber-alternative materials. Offering enhanced thermal performance and low maintenance, these windows are ideal for period properties requiring authentic replacements without compromising on efficiency.
Conservatories
Custom-built conservatories extend living spaces with energy-efficient glazing and durable frameworks. Designed to match existing architecture, these structures provide year-round usability through advanced insulation and ventilation systems. Perfect for families seeking additional light-filled space.
Questions
What areas do Harp Windows serve?
We install windows, doors, and conservatories across Hertfordshire, Buckinghamshire, Middlesex, and North London, including Watford, St Albans, and High Wycombe.
Are your products guaranteed?
All installations come with a 10-year insurance-backed guarantee covering both materials and workmanship for complete peace of mind.
How can I book a consultation?
Contact us via phone or our online Quick Quote form for a free, no-obligation consultation at your convenience.
Are you Which? Trusted Traders?
Yes, we are officially endorsed by Which? Trusted Trader, reflecting our commitment to customer satisfaction and ethical business practices.
Can I visit your showroom?
Our Watford showroom is open Monday-Friday 10am-3pm and Saturday 10am-2:30pm by appointment only.
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