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Secondary Double Glazing

Reduce draughts, quieten unwanted noise and keep your home warm without replacing your existing windows by fitting Anglian's secondary glazing. We've manufactured secondary double glazing for 50 years and can match it to your existing windows to unobtrusively add comfort to your home. Perfect for listed buildings!

White uPVC triple glazed window
up to 50% off windows up to 50% off windows
  • 10 year guarantee
  • Established in 1966
  • Made in Britain

If you want the benefits of double glazing but replacing your windows isn’t an option, secondary double glazing is the perfect choice. Our secondary double glazing has the following benefits:

  • Fits seamlessly over your existing windows
  • Helps to retain warmth
  • Improves sound insulation
  • Removes draughts from your existing windows

It’s a great solution if you live in a listed building or conservation area where replacing windows is more difficult.

Our secondary double glazed windows are available in a number of styles and are designed to match your existing windows, whatever the shape or size. They offer very slim, unobtrusive sight lines on the inside and are virtually invisible on the outside.

Vertical sliding units are perfect if your home has original sliding sash windows, and they can tilt for easy cleaning. If you have horizontally-opening windows, we can install matching sliding units for between two to five casements or, if your home has single opening casement windows, we can make secondary double glazing to match.

Whatever the style, our secondary double glazing windows are inconspicuous and blend effortlessly with your home. As with every Anglian window, our secondary double glazing is bespoke and individually made by our team of skilled craftspeople.

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Why Choose Anglian?

We believe the main reasons that 42% of customers return to us to buy more products, can be summed up by the Benefits of Anglian Glazed Windows. Our products offer superb quality and are backed by lengthy guarantees. We also support you throughout the process of replacing your windows with expert advice, fuss-free fitting and easy payment options.


Our experience and attention to detail means that you'll hardly notice your secondary double glazing as it efficiency helps to keep your home warm.

  • Made from extruded aluminium alloy and 4mm glass
  • BBA certified products
  • Fast, professional installation
  • Made in Britain
Read about our accreditations


We're confident that you'll enjoy your windows for many years to come, with guarantees for extra peace of mind:

  • 10-year guarantee on uPVC, wood and aluminium
  • 5-year guarantee on stained wooden windows
  • 15-year guarantee on our Ultra gas filled units
  • Additional Glass & Glazing Federation (GGF) protection
Our guarantees

Our Accreditations

Feefo accreditation
Awarded Feefo Trusted Merchant for customer satisfaction in 2015 & 2016
British Board of Agrement windows accreditation
The British Board of Agrement provides certification on the quality of our products.
Energy Saving Trust logo
Windows with a WER rating of A or above can be registered with the Energy Saving Trust.
Trustmark logo
TrustMark is a government endorsed not-for-profit organisation that operates a quality mark framework through more than 30 scheme operators who work in the repair, maintenance and improvement sector.
Glass and Glazing Federation logo
Anglian is a leading member of the Glass and Glazing Federation (GGF).
Made in Britain logo
Certifies products made from start to finish in a British factory by British craftspeople.
The Glazing Arbitration Scheme Logo
Independent service that deals with disputes between registered businesses and consumers.

Customer Reviews

Windows FAQs

Find out more about double and triple glazing in our useful Window FAQs Section or read our articles below

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Anglian FAQs

Got questions about choosing Anglian? Find out why Anglian is the right choice for your replacement windows.

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Home Inspiration From Anglian

Learn more about the latest glazing technology and gain inspiration on how to give your home a whole new look in our "Good to be Home" online magazine. We're brimming with ideas that you'll love and will help you to transform your home and garden.