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Frequently asked Questions

We’ve put together answers to some of the most common questions we receive about our glazing services. Whether you’re planning a home renovation or a large-scale commercial project, this page is here to help you understand what to expect when working with Invision Glazing.
If you don’t find what you’re looking for, feel free to contact our team directly — we’re always happy to help.

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  • Secondary glazing is an internal window installed discreetly behind your existing windows. It creates an insulating layer that reduces heat loss, minimises noise, and enhances security—without altering your original windows

  • A slim aluminium frame holds a pane of glass behind your current window. The air gap between the two panes acts as insulation, helping to retain warmth and block external noise

    • Noise reduction - Reduces noise by up to 80% (up to 54dB)

    • Thermal insulation - Improves energy efficiency and reduces heating costs

    • Added security - Creates an extra protective barrier

    • Preservation - Maintains the appearance of original windows, perfect for heritage buildings

  • Yes. Secondary glazing is often recommended where double glazing isn't permitted. Our slimline system is unobtrusive, fully reversible, and ideal for historic or protected buildings

  • Yes, secondary glazing can be installed in listed buildings. It is generally considered a reversible and non-invasive modification, making it a preferred option where replacement double glazing is not allowed.
    However, planning permission or listed building consent may be required depending on your local authority and the building's protection status. We recommend contacting your local council before installation, and we're happy to assist with any documentation or applications needed

  • Absolutely. We offer a range of styles—sliding, hinged, lift-out, and fixed

    -designed to work with your existing windows. They allow for ventilation, cleaning, and everyday use.

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