Harp Windows

Double Glazing Installers in Watford (Hertfordshire)

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91-93 St. Albans Road
WD17 1UL

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Opening hours

Monday to Thursday: 9:30am - 5pm

Friday: 9:30am - 4:30pm

Saturday: 10am - 2:30pm

Sunday: Closed

Key Services

bifolding doors, sash windows, windows doors conservatories


  • Trustworthy
  • Innovative
  • Committed to our customers
  • Members of the Consumer Protection Association
  • Suitable for conservation areas
  • Timber replacement windows & doors
  • WHICH Trusted Trader
  • Hertfordshire Trading Standards Approved

Double glazing, double glazed doors. Window installers Watford, Harrow, St Albans, Rickmansworth

Based in Watford, Hertfordshire, Harp Windows is a family owned and family run company, and was established back in 1989. We both manufacture and install high quality replacement windows, doors and conservatories. Over the years, we've worked hard to build up an established local reputation based on professional integrity, efficient customer service, quality and value for money.

Established since 1989

We've been trading under the same name since 1989. Then and now, our mission is, quite simply, to provide top quality local installations. We may not be the cheapest but we have full confidence in the quality and integrity of our products and our fitting teams.

Not just any old windows and doors

There's a wide selection of products out there ... don't assume they're all the same because they're not! We're pleased to be able to offer our customers the very latest innovations in products, such as our Evolution FLUSH timber replacement system and our stunning Origin bifolding doors that come with a 20 YEAR manufacturers' guarantee. Beat that!

Here to help you after your installation

A caring double glazing company? Yes it's true! Our in-house service engineer is here on hand if you experience any problems with your installation. If you're within your ten year guarantee period and you have a problem, give us a call and we'll fix it for you free of charge.

Protecting you every step of the way

The CPA administer our insurance policies for our guarantees.
Each and every CPA member is thoroughly checked and approved
toensure they meet the exacting standards of best practices
within their chosen trade. Only then are they eligible to join the
CPA membership scheme that requires them to display consistent
craftsmanship and excellent customer service.

Discover the perfect sash window

We specialise in the manufacture and installation of the Sheerframe® environmental sash window system. These vertically sliding sash windows are the perfect answer for period homes and period style properties, replicating the look of traditional timber sashes with the added heat and sound insulation properties of modern materials. Incorporating the very latest locking systems, adjustable restrictors and traditional timber aesthetics, our sash windows combine modern technology with traditional good looks for the perfect sash window.

The Sheerframe environmental sash window is acknowledged by architects, specifiers and planners as one of the most stylish designs in its class. A truly unique window that dispels the myth that traditional timber sash windows cannot be replicated in uPVC. It has even been approved for use within conservation areas across the UK and Ireland, including the Oxhey Village Conservation Area.

Windows and doors that look just like wood

The Evolution STORM 2 and FLUSH ranges successfully merges high-tech production values with hand-finished craftsmanship producing beautiful windows every time. It's this attention to detail that is applied to every single aspect of your Evolution window that makes it different from the rest. Mechanically built to truly resemble a timber window, with distinctive finishing touches such as monkey-tail handles and working peg stays to add traditional style and elegance to your window.

About Harp Windows (Watford) Ltd

Established in 1989, Harp Windows is a family run company manufacturing and installing high quality replacement windows, doors and conservatories. Over the years, we've worked hard to build a reputation for professional integrity, efficient customer service, high quality products and value for money. Customer satisfaction is paramount to Harp Windows, we do everything possible to ensure our customers are delighted with their new windows, doors or conservatory. We are fully endorsed by WHICH as a Trusted Trader, plus you can read many reviews about us on Checkatrade – and for further peace of mind our customers are always welcome to visit us at our showroom on the St Albans Road in Watford (plenty of free carparking), or our factory in Watford, where we manufacture many of our products.

There are many good reasons to choose Harp Windows as your installer, including:

** Fully endorsed as a WHICH Trusted Trader and Hertfordshire Trading Standards approved.
** We are members of FENSA.
** Our products are fully guaranteed for ten years.
** We offer guarantee protection insurance backed warranties.
** We are members of The Consumer Protection Association and Checkatrade.
** Comprehensive aftersales service.

Based in Watford, Hertfordshire we install high quality replacement windows, doors and conservatories in Watford, St Albans, Harrow, Hemel Hempstead, Berkhamsted, Amersham, Beaconsfield, High Wycombe and throughout Hertfordshire, Buckinghamshire, Middlesex and North London.

Would you like more information on our products? Check out our website www.harp-windows.co.uk and download our brochures and watch our product videos. Call us at our showroom on (01923) 231111 or email us at info@harp-windows.co.uk.

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Products and Services

Evolution Timber Replacement Windows

Evolution are the industry leading manufacturer of timber window and door alternatives. They have pioneered a number of industry firsts with their unique window and door range to give homeowners an attractive alternative to timber or uPVC.

Evolution Timber Replacement Windows

Origin Bifold Doors

Origin is the UK's leading specialist manufacturer of aluminium bifolding doors. Each and every door is bespoke and available in a huge variety of opening bifold configurations.

Origin Bifold Doors

We offer these services

  • Free Parking
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We offer these payment methods

  • Cash
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  • Delta
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  • Bank Transfer


Mike and Alan were both very pleasant when they came out to quote and measure up. Jeff was also very friendly and a clean and tidy worker! I would happily recommend Harp and wouldn't hesitate to use you again in the future. Many thanks. We are very pleased with the end result - the windows look great and Jeff put a lot of effort into finishing the woodwork, etc, - a great job! Mrs Karaiskos, Northwood.

Harp Windows (Watford) Ltd

Very satisfied, all of the staff I have dealt with have been brilliant! I will be using Harp for my back door in the future! Mrs Breathnach, Watford.

Harp Windows (Watford) Ltd

Testimonials are added by the business owner and are not independently verified.

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