Secondary Glazing For Sash Windows.

Premium Glass Secondary Glazing for Sash Windows in Listed Buildings, Conservation Areas & Heritage Homes.

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Beautiful Scottish Home
Inside of a Sash window with secondary glazing installed
Outside of a Sash window with secondary glazing installed
Inside of sash window with secondary glazing installed
Screenshot 2025-09-12 at 07.47.49
Inside of sash window with secondary glazing installed
Beautiful Heritage Home
Secondary glazing panel open for ventilation on sash window

Noise Reduction

Draught Proofing

Thermal Efficiency

Retro - Fitting

Why Choose Us?

Our patented secondary glazing for listed buildings delivers unmatched performance, while also maintaining a heritage-friendly design.

In addition, the CSG system offers best-in-market noise reduction, cutting external sound by up to 50%. Moreover, it provides superior draught proofing that seals the entire window — not just the glass panes.

What’s more, it is removable and completely reversible. As a result, it causes no damage to your original windows. Thanks to its discreet design, it blends seamlessly with your heritage property, and importantly, it requires no planning permission.

You may also be eligible for a grant or loan — click HERE to learn more.

Lastly, we can cover most of Scotland, as well as many areas of England.

Specifications
CSG Team

Customer Testimonials

"These guys did our secondary glazing and I can confirm it’s both a great product and a great company! It’s basically the only option out there that gives those kind of results without impacting your shutters."
Dylan BurnsCustomer
"Absolutely brilliant, the noise reduction is amazing. 12/10"
Charlotte TaylorCustomer
From start to finish the friendliness and professionalism was exemplary. The work completed is of the highest quality and it is like they have never been, so tidy and clean. The difference the product has made has been is brilliant and fitted so well it is beyond discrete and doesn’t detract from the look and feel of the room at all. Totally excellent and i couldn’t recommend them highly enough.
Mark WilockCustomer

Get In Touch With Us

Interested in preserving your windows with modern comfort? Get in touch today for expert advice and a free quote.

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