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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, aluminium and timber:

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 premium sliding sash windows
Quickslide uPVC sliding sash windows
ALUK aluminium windows and doors
Kömmerling uPVC casement windows and doors
Gerda High security contemporary aluminium and steel doors
Bereco sustainably sourced engineered timber windows

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.

39:T908,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 showro