Business Details
37 Years
experience
Your Trusted Partner for Windows & Doors in Watford
Established in 1989, Harp Windows is a family-run business with decades of experience manufacturing and installing high-quality replacement windows, doors, and conservatories. Our reputation is built on professional integrity, efficient customer service, and value for money, with a relentless focus on customer satisfaction. We are endorsed by Which? as a Trusted Trader and hold accreditations from FENSA, The Consumer Protection Association, and Checkatrade. Our comprehensive aftersales service ensures complete peace of mind, including a 10-year product guarantee backed by insurance.Based in Watford, we serve Hertfordshire, Buckinghamshire, Middlesex, and North London, offering free, no-obligation quotations and a showroom displaying our full product range. Our team combines technical expertise with old-fashioned friendly advice, ensuring every installation meets the highest standards of craftsmanship and durability.
Services
Windows
Doors
Conservatories
Bi-Folding Doors
Sliding Sash Windows
Casement Windows
Composite Doors
Timber Alternative Windows
Details
- Year established: 1989
Highlights and features
- We have over 35 years of experience in window and door installations.
- Fully endorsed as a Which? Trusted Trader and Hertfordshire Trading Standards approved.
- We are a FENSA registered company with a 10-year product guarantee.
- Our products are backed by guarantee protection insurance.
- We serve Watford, St Albans, Harrow, and surrounding areas with local expertise.
Associations and certifications
- Which? Trusted Trader
- FENSA
- The Consumer Protection Association
- Checkatrade
- Origin Premium Partners
What people say
Fantastic service
Excellent service
Quality window
Highly recommend
No fuss
Services
Bi-Folding Doors
Transform your living space with our market-leading bi-folding doors, designed to maximise natural light and create seamless indoor-outdoor transitions. Crafted with precision engineering, these doors offer exceptional thermal efficiency, security, and low-maintenance durability. Ideal for modernising homes while enhancing aesthetic appeal and functionality.
Sliding Sash Windows
Our sliding sash windows combine traditional aesthetics with modern performance benefits. Featuring draught-proofing technology and advanced double glazing, they provide superior thermal and acoustic insulation while maintaining the classic charm of heritage properties. Available in uPVC and timber-alternative materials for lasting durability.
Composite Doors
Enhance your home's security and curb appeal with our high-specification composite doors. These doors integrate reinforced frames, multi-point locking systems, and weather-resistant materials to deliver maximum protection and energy efficiency. Customisable designs ensure perfect compatibility with both modern and traditional property styles.
Timber Alternative Windows
Experience the timeless beauty of timber with our low-maintenance timber-alternative windows. These uPVC windows replicate authentic woodgrain finishes while offering enhanced durability against weathering. Features include mechanical joints for traditional detailing, deep wood-like cills, and advanced thermal performance for year-round comfort.
Conservatories
Create additional living space with our bespoke conservatories designed to complement your property's architecture. Constructed using energy-efficient glazing and thermally broken aluminium frames, these structures provide year-round usability with minimal heat loss. Available in Victorian, Edwardian, and modern designs to suit various property styles.
Questions
Do you offer a guarantee on your installations?
All our products come with a 10-year guarantee backed by insurance, ensuring long-term peace of mind.
Are your installers certified professionals?
We are FENSA registered and Which? Trusted Traders, with fully trained technicians adhering to industry standards.
Can I visit your showroom?
Our Watford showroom is open Monday-Friday 10am-3pm and Saturday 10am-2:30pm by appointment.
How long does installation take?
Most window/door installations complete within 1-2 days, with conservatories typically taking 3-5 working days.
Do you provide after-sales support?
We offer comprehensive aftersales service, including emergency repairs and routine maintenance checks.
Are your products energy efficient?
Our windows and doors meet current Building Regulations with A-rated energy efficiency options available.
Videos
Reviews (6)
Reg Lopez
Dec 02, 2021
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The team from Harp did a great job with our windows. From providing all the info needed to comply with the landlord's licensing requirements to installation. The windows look lovely and the guys did an amazing job with so little mess. Very pleased indeed. Given the windows industry suffers a bit in terms of reputation, it's been a pleasure to deal with knowledgeable, good people before and during the installation. Thank you - we are really pleased and wouldn't hesitate to recommend.
Reg Lopez
Nov 29, 2021
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The team from Harp did a great job with our windows . From providing all the info needed to comply with the landlords licensing requirements to installation . The windows look lovely and the guys did an amazing job with so little mess. Very pleased indeed . Given the windows industry suffers a bit in terms of reputation , its been a pleasure to deal with knowledgeable, good people before and during the installation . Thank you - we are really pleased and wouldnt hesitate to recommend.
Alex Jones
Oct 16, 2021
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What fantastic service I have received from the start of engaging with Harp until completion of the job. Everyone was an absolute pleasure to deal with and the windows look great - the left so little to sort out and cleaned up so nicely. I would highly recommend Harp to anyone!
Terry Jones
Jul 23, 2021
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Fantastic job, v professional results. And it was the cheapest quote too. The guys took pride in their work & seemed to enjoy it. Replaced all our windows & a door & it looks great. Wish they'd worn ear defenders to protect themselves though! Not enough people look after themselves on the job.
David Elliott
Sep 13, 2020
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Just to thank John & his colleague from Harp Windows Watford who responded today to a team member's emergency when a door would not lock. Visited very quickly & sorted out the problem with expertise & good humour on a very hot day Harp Windows Highly recommended
Jimviv
Dec 24, 2019
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Just had two bay windows renewed. Excellent work by careful and thoughtful installers, and reasonable prices. Highly recommended.
