One of the UK's leading suppliers and installers of secondary glazing.
Nationwide coverage in mainland UK.
Bespoke secondary glazing - we can fully install or deliver to you for DIY fitting.
We give friendly, informed advice to help you make the right decision.
Fit secondary glazing to stop draughts, reduce heat loss and combat noise effectively.
PRICE MATCH PROMISE - always giving the best value.

We promise to always advise you honestly about the potential solutions to your current heat loss, noise and security issues so that you can arrive at an informed decision in your own time.

We promise to always treat your home and possessions as we would treat our own, and ensure that we protect them carefully while we are carrying out the work.

We promise that we will never use any form of pressure selling.

All our secondary glazing products have been independently tested by UKAS and is the most effective system available in the UK today.

Black Knight - large enough to cope; small enough to care.

Highlights, Specialties & Features

  • Price Match Guarantee - we will match any genuine, written quotation for comparable product

Serviced Areas

  • National

Payment Options

  • Cash, Bank transfer

Contact Details

  Website
  City Chesterfield
  Postcode S41 0TZ
  Address Tapton Park Innovation Centre Brimington Road
  Phone Number 080 8168 5208
  Tollfree 0808 168 5208

Products & Services

Secondary Glazing Balanced Vertical Slider

The Black Knight balanced vertical slider has been designed to copy the sliding motion of a traditional sash window and each individual sash is supported by pre-tensioned spiral balances which allow the panels to be opened in a variety of positions.


Secondary Glazing Tilt-in Vertical Slider

When access to an existing sash window is difficult the secondary glazing can be manufactured to include a tilt-in facility which lets the sashes be pivoted into the room for cleaning and maintenance of the existing primary window.


Secondary Glazing Horizontal Slider

Horizontal sliders can be manufactured in combinations including 2, 3, 4 & 5 panels and each one of the individual glazed sashes can be removed to allow for easy cleaning and maintenance of the frame of the existing window.


Secondary Glazing Lift Out

As yu would expect, lift out secondary glazing is the simplest & cheapest design in the range. They have no moving parts and so is ideal for situations where there are no opening parts of the existing window or where access for maintenance & cleaning ly is needed.


Secondary Glazing Hinged Unit

Black Knight secondary double glazing hinged windows are an adaptable unit design that allows the greatest range of easy access to the primary window for maintenance and cleaning.

Social Activity

OUR PRICE PROMISE We will match any genuine written quotation that you have for a like-for-like product and promise to save you at least 5% off the total cost
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It's definitely getting chillier at night now! A good time to begin thinking about fitting secondary glazing to keep the cold out and the heat in.
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As we get towards autumn and the nights start to get colder, this is the ideal time to think about installing secondary glazing. No need to rip out your existing character windows - Black Knight secondary glazing fits neatly inside them to give 100% protection
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From Our Website

We install high quality aluminium secondary glazing windows in all types of properties in the UK. We cover the major cities of London, Birmingham, Bristol, Manchester, Leeds and Liverpool together with many other areas. We are specialist suppliers and installers of aluminium secondary glazing windows with over 30 years' experience of this product. Unlike many companies we do not just do secondary glazing as a sideline to other glazing products. Secondary glazing windows are the most cost-effective way of achieving maximum thermal insulation of your existing windows and doors and, when installed with high performance acoustic glass, will provide optimum soundproofing.


All Black Knight secondary glazing are designed to ensure that only minimal maintenance is needed. Please read and follow the cleaning and safety instructions when you carry out any maintenance or cleaning. Always follow safety guidelines as recommended by HSE when handling secondary glazing panels. In line with our policy of continuous product improvement & development Black Knight Secondary Glazing reserves the right to alter any of the product specifications without notice.


Fitting DIY secondary glazing kits yourself is relatively simple for the average competent DIY'er and no specialist tools are needed - if finances are an issue then it is the ideal way to keep the cost of your project reasonable. In the first instance please refer to our comprehensivehow to measureguide to help you take accurate measurements for your secondary glazing kits and also to ourhow to fit guide for easy-to-follow fitting instructions. We supply all the finishing trims that you will need to make a perfect job and no after-fit redecoration is normally required.