Secondary glazing increases the thermal efficiency of your existing windows, eliminating cold spots and draughts and helping to retain heat. It is for this reason that secondary glazing is becoming an increasingly popular choice amongst homeowners in place of costly triple glazing.

Secondary double glazing refers to the single pane of glass that is installed inside your home on to an existing window unit. The hardwood subframe and thick glass work together to create a unique secondary glazing unit that actively retains heat. These units operate as part of your window to eliminate any chances of damage, intrusion and heat loss.

They are perfect for listed buildings and those looking to increase the thermal efficiency of their home in conservation areas. Our secondary glazing units will increase the thermal efficiency of your home while reducing noise intrusion by up to 80%.

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Keeping Warm with Secondary Double Glazing

The main reason why people choose secondary double glazing is due to the high level of comfort that it brings to your home. With our range of options, you can choose the perfect one to make sure your home is warm and comfortable.

Save Money with Us

Our units keep your home warmer for longer, minimising heat loss by as much as 65%. This means you won’t need to turn up the thermostat, which will save you money on your heating bills.

Lower U-Values

U-value scores indicate how effective a material is at retaining heat, which means the lower the score, the better the window is at insulating your home. Each unit we offer comes with a 0.8W/m2K u-value, making it perfect at insulating your home.

Eliminating Draughts

Draughts can make rooms cold and uncomfortable, rendering them unusable for many homeowners.

Available in a range of 4mm, 6mm or 8mm in size, our secondary double glazing is perfect for eliminating unwanted draughts and cold spots.

We also utilise E glass, which uses a specific coating that reflects heat back inside your home, improving the performance of your windows.

Secondary Glazing Manufacturer


Our Recommendation

To ensure you are getting the most out of our glazing unit, we recommend fitting your second unit with an air cavity no deeper than 80mm.

Framing Your Secondary Double Glazing

At Granada, we can manufacture our secondary double glazing units to feature a hardwood subframe. This ensures your home has an excellent thermal barrier, whilst stopping the aluminium frame in the unit from cooling too much.

Improved Acoustic Performance

By installing secondary double glazing in your home, you will be eliminating almost all sounds coming from the outside world. This makes our home glazing unit perfect for if you live in busy areas or near a main road.

Secondary Double Glazing Prices


Enhanced Security Levels

Secondary double glazing is ideal for those living in multi-storey buildings due to its ability to ensure you are kept safe and secure inside your home.

We utilise the very best materials to make sure you are being given heightened security, which is why we only use strong glass in all our units.

Increased Market-Value

By installing our secondary double glazing unit, not only are you making your home more thermally efficient but also more attractive to prospective buyers.

Due to having high levels of insulation and a low U-value, your home will be more aesthetically pleasing, making it easier to sell later should you want to.

Reduce the Risk of Condensation

Poorly installed double glazing can invite water and cold air into your home. This is where Granada can help. With our secondary double glazing unit, you can protect your home from the outside elements, making it more thermally insulated without the condensation.

Secondary Glazed Windows Thermal Efficiency


Secondary Double Glazing Aesthetics

Our units are designed to blend in seamlessly with your home, internally and externally. Available in a neutral design and slim sightlines, your thermal units are sure not to clash with the architecture of your home.


Find Out More About Granada’s Secondary Double Glazing

To hear more about our thermally efficient secondary double glazing unit, give us a call today on 0845 900 3899. We will be happy to talk you through the range, going into more depth on the benefits of our thermally insulating secondary double glazing units.