DIY Secondary Glazing

We have grown steadily and we are now the largest specialist manufacturer and supplier of DIY secondary double glazing kits in the UK.

We manufacture a full range of high quality, discreet, aluminium secondary glazing systems and provide an extensive variety of options, accessories and extras.

To self-install secondary glazing, we advise that you need to be a competent person with a good grasp of DIY basics. You may need an extra pair of hands to help with large units and, importantly, complete accurate and extensive measurements.

All secondary window units are delivered by prior appointment and are ready for easy installation.

They arrive fully assembled, except on occasion large units may be delivered with the outer frame disassembled (for ease of handling) ready to easily screw back together.

All are fully glazed with pre-drilled fixing locations and shrink-wrapped for protection.

Available options:

  • Alternative to the standard finish (white)
  • optical quality float glass glazing
  • locks, couplers, trickle vents
  • bay sub-frames
  • safety glass, thermal glass, noise insulation glass
  • obscure & patterned glass
  • child safety opening restrictors
  • Pre-prepared Angled Bay Subframes

Each secondary window comes with a comprehensive, no-quibble, 5-year guarantee.

Call 0845 900 3899

The benefits


Well-fitted secondary glazing offers the most effective noise insulation, significantly outperforming double glazing.


Substantially improves the thermal insulation of existing single-glazed windows – reduces heat loss through the window by around 65% – around 10% more than double glazing


Secondary windows offer an affordable, discreet, highly effective solution to enhancing building security. No external access is required, ideal for multi-storey buildings


Our products complement your home, providing maximum benefits and years of trouble-free service, specified and designed for thermal and sound insulation, additional security and condensation control.

Retain Character

Much of the Granada range has been specifically designed for listed building windows, conservation areas and heritage properties.


Where condensation is a major issue, we often specify secondary glazing with balanced trickle ventilation. This provides a simple, cost-effective, and permanent solution.

Secondary Glazing Bay Window

Cold Bay Window – South Yorkshire

Timber windows give a property, charm and character. Over time they can leak vital heat, for the winter months this can cause a room to feel cold and also increase energy bills. A solution to this is to fit secondary glazing which can decrease noise levels breaching...
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Lady with Secondary Glazed Windows

Lyndhurst Road, Sheffield

“The condensation issues that I’ve been putting up with for 28 years have finally been resolved. You can’t fail to notice the noise reduction either — our new secondary glazing provides a feeling of quiet and calmness.” Diane Hale, Homeowner Sheffield...
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The Jones Family

When Paul Jones, who has worked as a trimmer in Granada’s workshop for two years, realised his family could benefit from secondary glazing in their home, we offered to provide them with glazing and put the acoustic properties of our products to the test. For Paul and...
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Our DIY Secondary Glazing Products

Our DIY products include horizontal and vertical sliders, and other bespoke secondary glazing windows. Every commercial project is unique, we offer a full managed solution from design, manufacture and installation. What remains the same is complete project management focus and attention to detail.

Get a quote today