• Watford - 01923 231 111
  • St Albans - 01727 789 007
  • Harrow - 0208 419 8818
  • High Wycombe - 01494 411 266

Welcome to Harp Windows

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. 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 at Bushey Arches, 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:

  • Long established, local company
  • 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
  • Comprehensive “aftersales service”

Based in Watford, 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.

If you would like to receive a free, no obligation quotation please call us on 01923 231 111 or use our online “Quick Quote” service – we’re here to help.

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Our Products

  • Bi-folding Doors

    Break down the barriers between inside and out and bring gorgeous sunlight flooding into your home

  • Patio and French Doors

    Patio & French doors add a graceful touch to any home. Available in white, golden oak or rosewood frame finishes

  • Composite Doors

    Our timber effect composite front doors are made of uPVC but are virtually indistinguishable from timber.

  • Orangeries

    An orangery combines the best features of a traditionally built room extension with the added benefits of “living under glass”

  • Conservatories

    From a modest lean-to design to a stunning Victorian classic, the choice is yours

  • Double Glazed Window

    Continually developed over the past 22 years, our windows combine the very best in security, safety, looks and durability

Read our customer questionnaires
  • A Banks, Bushey, Herts

    “Just a short note to thank all at Harp Windows for a job carried out efficiently and professionally and to my complete satisfaction. I shall have no problem with recommending Harp Windows to anyone, and in fact have already done so”

  • M Long, Hemel Hempstead, Herts

    “I had my windows and porch installed by yourselves and was very pleased with the service, so much so I Recommended them to two people who have since had installations from you …”

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  • Harp Windows (Watford) Ltd
  • 30 Aldenham Road
  • Watford
  • Hertfordshire
  • WD19 4AA


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