How does Secondary Glazing Work?
Secondary Glazing is a single glazed window panel that sits behind your existing single or double-glazed window. The small gap in-between creates an extra layer of insulation by slowing the movement of heat from one side of your window to the other.
Explore Secondary Glazing Types
Horizontal Sliding Secondary Glazing
Designed to match your existing windows, horizontal frames slide smoothly open and closed on aluminium runners, helping keep heat in, and draughts out.
Hinged Secondary Glazing
This option is ideal for traditional casement windows, as the secondary glazing swings open on a small hinge, in line with the mechanism of the window behind it.
Vertical Sliding Secondary Glazing
Perfect for box sash windows, the panels in these vertical sliding frames move easily up, down and can tilt inwards to provide easy cleaning access to the original window.
Reasons to Choose Secondary Glazing
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Reduces Outside Noise
The extra pane of secondary glazing adds a layer of sound insulation which helps reduce outside noise. This is particularly useful if your home has single-glazed windows or is on a main road.
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Easy to Maintain
A more discreet alternative to replacing your windows, secondary glazing needs little upkeep, requiring some lubrication and the occasional clean.
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Tough and Secure
Secondary glazing frames are made from uPVC and provide a strong barrier behind your existing windows. Having an extra pane of glass makes your windows harder to break than single-glazing alone.
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Cost–Effective Solution
With a faster installation process and fewer materials, secondary glazing can be more affordable than replacing all your windows.
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Adds an Insulating Layer
Installing secondary glazing adds another barrier that helps prevent draughts and cold air coming through your windows. This helps to lower the energy consumption of your home to reduce energy bills.
Working with the Best Industry Bodies to Install the Best Secondary Glazing
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FENSA
The Fenestration Self-Assessment Scheme (FENSA) ensures replacement window and door installations comply with building regulations for England and Wales. You receive a FENSA certificate to keep as proof of compliance.
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GGF
Anglian is a leading member of the Glass and Glazing Federation (GGF). The GGF monitors the performance of member companies, ensuring the standard of products and their installation remains consistently high.
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Made in Britain
The ‘Made in Britain’ marque on all our products means they are made from start to finish in a British factory by British craftspeople.
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Recovinyl Plus
Recovinyl is an initiative advancing the sustainable development of the European PVC industry by improving production processes, minimise emissions, develop recycling technology and boost the collection and recycling of waste.
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TrustMark
TrustMark is a not-for-profit organisation operating a quality mark framework in the repair, maintenance and improvement sector. Registration with Trustmark demonstrates commitment to customer service, high standards and continual improvement.
Secondary Glazing with Quality at the Heart
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Secondary Glazing Gallery
Our Happy Customers
Mr Pearson, Derbyshire
White uPVC sliding sash window with secondary glazing
“Anglian’s secondary glazing was the perfect solution for our listed building, as we couldn’t replace our windows with uPVC. We were very happy with everything and now we have a warmer home with no draughts.”Get a Price
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Decide if Secondary Glazing is right for your home
How do double and triple glazed windows work?
Find out more about the different types of glazing and how they keep your home warmer and more secure.
Energy efficiency by type
Learn more about the energy efficiency of different glazing types and the options to help your home retain heat in Winter.
Made to measure windows
Discover how we help you create bespoke windows that are just right for your space, and you home.
Your Questions Answered by us
Secondary glazing is a pane of glass fitted in a separate frame on the inside of your existing windows. Double glazing is two panes of glass with the space in between filled with argon gas and vacuum-sealed inside your actual window frame.
The cost of secondary glazing is determined by the size of the window opening you have and how easy it is to install. There are kits that you can buy relatively cheaply which have standard sizes. However, most period homes have odd shapes and lines around window openings, making standard sizes difficult to fit. The best secondary glazing is often bespoke because you get the perfect fit.
You don’t usually need planning permission for secondary glazing, even on listed buildings and those in conservation areas. The main advantage of secondary glazing is that it doesn’t change the look or fabric of the building, so you retain period features outside and inside. If for any reason you do require planning permission, don’t worry, we’ll take care of everything for you.
Secondary glazing can dramatically reduce the chance of condensation forming your windows. Condensation is formed when warm moist air meets a cold surface. Secondary glazing sits behind windows that are exposed to colder temperatures, creating a barrier between them and the rest of your home. This minimises the chances of condensation forming and keeps the warm air inside.
To clean your secondary glazing all you need is warm soapy water and a cloth to wipe the frame and glass. To clean the inside of side-hinged secondary windows, open them fully and clean them as you would the outside. If your windows open on a horizontal slider, then follow the instructions to take them out of the sliders and clean the panels individually. Secondary windows on vertical sliders can be tilted open to allow for easy cleaning.
Explore Similar Products
Our Accreditations and Licenses
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The British Board of Agrement provides certification on the quality of our products.
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Anglian’s PVC-U Casement and Tilt & Turn windows have enhanced security performance.
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The British Fenestration Ratings Council is the UK’s national system for rating energy efficient windows.
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The Fenestration Self-Assessment Scheme ensures window installers comply with buildings regulations in England & Wales.
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Look for our FSC® certified wooden window and door products on our website.
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Anglian is a leading member of the Glass and Glazing Federation (GGF). -
PVC Industry initiative to improve manufacturing, minimise emissions and develop recycling practices
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TrustMark is a government endorsed not-for-profit organisation that operates through more than 30 scheme operators.