Scores based on 214 reviews

Reliability & timekeeping

Invoice history based on 193 reviews.

Invoice History
Charged as per quote / estimate99.48%
Above quote / estimate: kept informed0.52%
Appointments reported as missed (6 months) 0
Average score 9.78
214 reviews
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Since 1989 we have been manufacturing and installing high quality home improvement products to properties around Hertfordshire, Middlesex and North London. We're proud to offer our customers a wide choice of quality bespoke products, including Evolution Storm and Evolution Flush, the latest innovation in timber replacement doors and windows. See us at our Watford showroom on the St Albans Road or our factory in Old's Approach Watford, where we manufacture many of our products.

Our Mission:
To provide top quality local installations. We may not be the cheapest out there but we have full confidence in the quality and integrity of our products and our fitting teams. The outward appearance of most replacement windows and doors can be almost identical, but don't be fooled into thinking that all uPVC products are more or less the same! The quality of the materials, construction, overall design, locking and weather proofing systems can vary immensely from manufacturer to manufacturer. Here at Harp, we only install top quality products in uPVC and aluminium: 

  • Rehau uPVC casement windows and doors,
  • Evolution Storm and Flush timber replacement windows and doors,
  • English Door Company for our premium range of front and back doors,
  • Origin aluminium windows, doors and bifolding doors,
  • Ultimate Rose uPVC sliding sash windows,
  • ALUK aluminium windows and doors.

Sales and Service:
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 us, we do everything possible to ensure our customers are delighted with their new windows, doors or conservatory. Our commitment to our customers does not simply end once your installation is complete. We provide a comprehensive aftersales service which provides total peace of mind for all our customers and we are fully committed to providing our customers with an after sales service that is second to none:

Browse our comprehensive Checkatrade Image Gallery for a great selection of photos of our many installations.

Based in

Watford, Hertfordshire, WD18 9TD

Works in

Amersham, Barnet, Beaconsfield, Bucks, Chesham, Edgware, Gerrards Cross, Harrow, Harpenden, Herts, High Wycombe, North London, Northwood, Pinner, Rickmansworth, St Albans, Stanmore, Uxbridge, Watford

Team photos

Celebrating 25+ years of continuous trading!