Composite Doors Reimagined. Elevate your home with Gerda's superb engineering, advanced security & unbeatable value.

Founded in 1989, Harp Windows stands as a family-run enterprise dedicated to the manufacturing and installation of premium replacement windows, doors, and conservatories.

Throughout the years, our unwavering commitment to professional integrity, efficient customer service, high-quality products, and value for money has been the cornerstone of our success. At Harp Windows, customer satisfaction is paramount – we go to great lengths to ensure that our customers are not just satisfied but are delighted with their new windows and doors.

Our endorsement by WHICH as a Trusted Trader reflects our commitment to excellence. You can trust Harp Windows for a seamless blend of craftsmanship, quality, and customer satisfaction every time.

What's Different about Gerda Doors?... Everything!

Aesthetically Appealing

  • Colour matched external cill as a standard.
  • Gerda doors are available in widths ranging from 840mm to 1130mm, offering a broader selection compared to other doors that typically start at 950mm wide.


Engineering Excellence

  • Faced with steel & aluminium for superior durability and resistance.
  • RC3 lock with 13 locking points, you can also upgrade the fuhr lock on the Thermo Prime Range.
  • Pre-drilled holes supplied with a fixing kit for easy and convenient installation.


Unmatched Security

  • State-of-the-art security features with burglary resistance accreditations PAS24 as a standard.
  • Revolutionary Smart Tedee Lock controlled by your phone.


Excellent Thermal Performance

  • Exceptionally energy-efficient, thanks to a unique thermal division that enhances the natural insulation.
  • U- values exceed the current and forthcoming Building Regulations with values of 0.74W/1.3m2k.
Gerda doors brochures

Gerda Front Door Range

Gerda’s four front door models Optima, Premium, Prime & Altus stand out with their superior design features and numerous specifications compared to mainstream aluminium front doors.

Gerda front doors, along with other high-quality options, are meticulously crafted to provide a visually superior aesthetic compared to front doors relying on the standard aluminum door concept.

Unlike aluminum doors that utilise a panel, Gerda doors feature a more authentic appearance with the glaze-in panel concept, making them stand out as a visually appealing choice.


Contact Harp Windows

Harp Windows is a small, local, family-run business and has been manufacturing and installing high performance windows and doors since 1989.

With a dedicated team committed to meeting your requirements, our extensive product range is chosen for its lasting performance and design excellence.

Our Gerda door range, blending steel and aluminum with innovative aesthetics, offers top-notch protection against weather and intrusion, featuring industry-leading locking systems for comprehensive security.

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Harp Windows (Watford) Ltd installation
Harp Windows (Watford) Ltd installation
Harp Windows (Watford) Ltd installation
Harp Windows (Watford) Ltd installation
Harp Windows (Watford) Ltd installation
Harp Windows (Watford) Ltd installation

Contact Details

91-93 St Albans Rd, Watford, WD17 1UL


  • Monday: 10:00am - 15:00pm
  • Tuesday: 10:00am - 15:00pm
  • Wednesday: 10:00am - 15:00pm
  • Thursday: 10:00am - 15:00pm
  • Friday: 10:00am - 15:00pm
  • Sat/Sun: 10:00am - 14:30pm, Sun: CLOSED

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