Scores based on 211 reviews

Reliability & timekeeping

Invoice history based on 190 reviews.

Invoice History
Charged as per quote / estimate99.47%
Above quote / estimate: kept informed0.53%
Appointments reported as missed (6 months) 0
Average score 9.78
211 reviews
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We are manufacturers and installers of high quality home improvement products. 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 or our factory in Watford, where we manufacture many of our products.

Our Mission:
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. 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 quality products such as Rehau windows and doors, Origin bifolding doors, ltimate Rose sash windows and Evolution Storm and Flush timber replacement windows and doors.


Browse our comprehensive Checkatrade Image Gallery for a great selection of photos of our many installations and even some customer feedback forms!

Based in

Watford, Hertfordshire, WD18 9TD

Works in

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

Team photos

Celebrating 25+ years of continuous trading!