Secondary
Glazing
Perfect for listed buildings
Unobtrusive design
Made-to-measure to reduce draughts
Weather resistent seals
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What is Secondary Glazing?


Secondary Glazing is the addition of a slim second window to an existing window. It is a discreet and unobtrusive method of insulating and soundproofing windows. It is also a popular solution in areas that have restrictions on the installation of double glazed windows such as listed buildings.

Our Secondary Glazing window options


uPvc >

  • Our most thermally efficient window
    • Flush sash option replicating the look of timber
      12 colour options
      Smooth or wood grain
      Highly secure GrabLock

Timber >

    • Our most thermally efficient window
      Flush sash option replicating the look of timber
      12 colour options
      Smooth or wood grain
      Highly secure GrabLock
  • The benefits of Everest seconday glazing windows


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    Significantly exceeds British Security Standards


    Everest casement windows significantly exceed British security standards. Secured by Design as standard, all UPVC casement windows have the option to upgrade to GrabLock. Developed with leading lock manufacturers, Yale, Grablock offers three times the surface area of a standard multi-point window lock – making it our most secure lock ever.

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    Energy efficient with A++ rated glazing


    Using advanced technology designed to reflect heat back into your room, Everest casement windows will keep your home warmer. An argon filed gap between the window panes, double draft resistant seals and a unique multi-chamber profile ensures your home retains heat. Rated a market leading A++21, the Everest triple glazed casement window is the warmest and safest available.

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    Significantly exceeds British Security Standards


    Everest casement windows significantly exceed British security standards. Secured by Design as standard, all UPVC casement windows have the option to upgrade to GrabLock. Developed with leading lock manufacturers, Yale, Grablock offers three times the surface area of a standard multi-point window lock – making it our most secure lock ever.




    Gallery of our secondary glazing windows


    Click an image below to go to see all our latest projects







    Technical Specifications of the secondary glazing system
    Secondary glazing FAQs

    click on q to expand find the answers to typical q's


    * 1) Glazing

    Air gap created between existing window and secondary glazing panel for increased heat and sound insulation BS EN 12150 - 1:2000 thermally toughened safety glass Optional 6.4mm laminated glass for increased security

    .1) Weather resistant seals

    Double seals fitted around the opening window

    3)3. Locking mechanism

    Sliding windows fitted with sprung catch locks that automatically fasten as the window is closed Lockable handles and security bolts on hinged windows

    4. Sliding inserts

    Cleverly interlock to help prevent draughts into your home

    5. . Aluminium frame

    Aluminium internal double glazing is low maintenance and will never rot, rust or flake Slim design hardly noticeable from outside, retaining the external character of propert




    Secondary glazing FAQs

    click on q to expand find the answers to typical q's


    * Why would I choose to have secondary glazing fitted?

    Secondary glazing offers you the same benefits of double glazing and is a great solution if you live in a listed building or a conservation area, where replacing windows can be more difficult, but heat loss and rattling can be common problems.

    . What are the benefits of secondary glazing?

    Secondary glazing acts as a form of double glazing by trapping air between the thermally toughened glass and your existing windows, which provides you better heat insulation and lower energy bills. This extra window also provides an additional barrier to help prevent break-ins and can reduce outside noise by up to 12 decibels, which is particularly useful if you live in a noisy environment.

    Is there a choice of glass with secondary glazing?

    Yes, we offer an extensive range of glass including obscure, decorative, security, and anti-sun, all of which are available to install within your aluminium secondary glazing frame.

    How much does secondary glazing cost?

    Like all Everest products, secondary glazing is bespoke and made-to-measure specifically for your home and needs. In order to give an accurate price for your windows one of our local consultants will need to view your property and take measurements before providing you with a free no-obligation quote.

    Guaranteed for peace of mind
    We offer a range of comprehensive guarantees including lifetime against fog, condensation and discolouration. Plus, our guarantees are transferrable should you sell your property.