About Us

Friendly, approachable and masters of our craft

We don’t always take the easy route, we’ll advise, design and install your secondary glazing as if it were in our own home. Like the Knight on a chess board, we often take a non-linear approach to getting the job done. But unlike the Knight piece, we don’t take the route that benefits us the most. Or makes us the most money. Our approach to business is—and always will be—customer first.

Why choose Black Knight?

Our work is a combination of the highest quality and affordability. Having worked with our product since it was first designed over 35 years ago, our team understands the niggles and nuances of the design, manufacture and installation. We know what we’re doing, and we’ll never employ or outsource our work to someone who doesn’t.

Reduce outside noise by 54dB with our secondary glazing products

More Info

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Hinged Casement

Fixed Windows

Lift Out Windows

Bespoke Windows

Black Knight Secondary Glazing Limited
Registered in England and Wales Number: 08638414
VAT Registration Number: 197 3861 56

Head Office

Unit 9, Prospect House, Colliery Close, Chesterfield, Derbyshire, S43 3QE

Office Tel

01246 229 000


0808 168 5208