Call us today on: 01909 499 899

Create a Peaceful, Warm & Secure Home with Granada Secondary Glazing

Secondary Glazing can be installed within all properties including Listed Buildings

Block Noise With Granada's Noise Cancelling Secondary Glazing

Secondary Glazing will reduce noise levels by up to 80%

Prevent Draughts and Reduce Heat Loss Through Existing Windows

Secondary Glazing can reduce heat loss by as much as 65%

Increase Security With Internal Locks

Granada’s secondary glazing can be locked from the inside to enhance security and safety

Secondary Glazing is Slimline, Discreet and Durable

Made from durable aluminium all of Granada’s secondary glazing is manufactured within the UK

Create a Peaceful, Warm & Secure Home with Secondary Glazing

Reduce Noise Levels by up to 80% with Secondary Glazing

Prevent draughts and Reduce Heat Loss Through Existing Windows

Slimline, Discrete and Durable Secondary Glazing

Secondary Glazing for Hotels, Education. Offices and Commercial Buildings

Bespoke, Handcrafted Secondary Glazing

We specialise in the design, manufacture and installation of aluminium secondary glazing. This involves fitting a discreet internal window that keeps the character of your property and exceeds the benefits of double glazing. Whether you’re a homeowner or a commercial developer, find out how we can transform your property with secondary double glazing by calling us today on 01909 499 899

What is Secondary Glazing?

Secondary glazing is a slimline window that is discreetly installed onto the inside of your exiting window. It is designed to increase acoustic and thermal insulation and to offer enhanced security. Each window is made to measure and can be customised to match the style, function and colour of your primary windows. Not just limited to heritage properties and listed buildings, secondary glazing is often installed to give an enhanced performance for single, double and triple glazing.

When you take advantage of secondary double glazing, you enjoy all the benefits that come with an extra layer of insulation over your windows. This cuts down on heat transfer, which means that your home retains heat leading to reduced energy consumption and costs.

If noise entering your home is a nuisance, Granada’s range of bespoke aluminium secondary glazing will substantially help. Most homeowners will notice up to 80% noise reduction allowing secondary glazing to create a peaceful, warm and secure home.

Choosing Granada Secondary Glazing

With over 25 years’ experience designing and manufacturing bespoke secondary glazing, we ensure the highest levels of quality and very best acoustic and thermal performance. Our range of aluminium secondary glazing is made to measure ensuring all windows fit perfectly and match the design aesthetic of your home.

We expertly design and manufacture a range of styles to complement all property types. Our durable aluminium frames are powder coated in-house where you can choose from over 200 RAL colours. Customising the colour gives you the flexibility to match the interior of your room, allowing the secondary glazing to blend in seamlessly.

Granada Glazing has partnered with a trusted and dedicated installer network that has been selected and trained to offer the best acoustic and thermal solution within your local area. Our trusted installer network can supply and install our products across the whole of the UK. We have helped 1000’s of homeowners cure their acoustic and thermal problems where we can do the same for you.

Our Secondary Glazing Products

Vertical Sliding Secondary Glazing
Vertical Secondary Glazing

Vertical sliders are used in conjunction with traditional box sash windows. A tilt-in option is available which enables both panels to individually tilt into the room for easy cleaning.

Vertical Sliding Secondary Glazing

Hinged Casement Secondary Glazing
Hinged Secondary Glazing

Hinged casements are normally used in conjunction with casement windows or traditional box sash windows. The glazed panes operate on hinges and open into the room.

Hinged Secondary Glazing

Fixed Secondary Glazing
Fixed Secondary Double Glazing

Our most simple secondary glazing product, typically used when there’s a minimal area available for fixing into. Unlike our other products, once installed the glazed panel can’t be removed.

Fixed Secondary Glazing

Lift Out Secondary Glazing
Liftout Secondary Glazing

The glazed panels are held in place with a slimline aluminium outer frame. Panels can simply be lifted out of the outer frame to give access to the primary window.

Lift Out Secondary Glazing

Bespoke Secondary Glazing
Bespoke Windows Secondary Glazing

If you are unsure which secondary glazing system is most suitable for your property or you require a bespoke shaped window please complete the from where we will call you to discuss.

Bespoke Secondary Glazing


Why Choose Secondary Glazing?

80% Sound Insulation

Secondary double glazing offers the most effective sound insulation – significantly outperforming double glazing. Our windows can reduce noise levels by up to 80%.

Thermal Insulation

65% Thermal Insulation

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

Increased Security

Increased Security

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

Secondary Glazing for Homeowners

There are many reasons for homeowners to consider installing secondary glazing from Granada – beginning with acoustic insulation. Secondary glazing will block unwanted noise from close by traffic, planes, trains and other sources of noise.

Homes that suffer from heat loss will see a substantial increase in thermal insulation, secondary glazing installed with a low-e glass can reduce heat loss by as much as 65%. With a range of additional glazing styles we have available, you’ll end up with an attractive, unobtrusive finish that is sympathetic to the surroundings and existing window styles.

Hinged units Granada
Listed building
Secondary Glazing Building
Hinged units Granada
Hinged units Granada
Hinged units Granada

Secondary Glazing Blocks Noise

Secondary Glazing Adds Value

Secondary glazing exceeds the value of traditional double glazing. In addition to providing outstanding thermal and noise insulation, this style of glazing is also extremely discrete – to the extent that a casual observer would be unlikely to notice its presence at all.

Your home will be warm and quiet with our secondary glazing. This level of subtlety allows historic homes to retain their character whilst taking advantage of more recent breakthroughs in additional glazing. We offer a wide variety of styles and finishes that you can install at your property, ensuring that the finish you choose blends perfectly with the existing design, style and motif that are already in place.

Secondary Glazing For Homeowners

There are many reasons for homeowners to consider installing secondary double glazing from Granada – beginning with thermal insulation. Air-conditioned spaces allow in less heat during the summer, while less heat escapes during the winter. Needless to say, reducing heat transfer through the windows can have a significant effect on your monthly heating and cooling bills. And with the range of styles we have available, you’ll end up with an attractive, unobtrusive finish that is sympathetic to the surroundings and existing window styles.

Secondary Glazing England

View our Secondary Glazing Colour Range


Traditional White Gloss

Brown Gloss

Van Dyke Brown Gloss

Black Satin

Black Satin


Cream Satin

Anthricite Grey

Anthracite Grey

Anthricite Grey

Pure White

Anthricite Grey

Choose from over 200 RAL Colours

Listed building
Secondary Glazing Building
Hinged units Granada

Retain the Character of your Property

One of the most important benefits of secondary glazing is the fact that it can enhance the technical performance of a property without detracting from its charm or character. By taking advantage of our additional glazing products, you’ll also benefit from added security, reduced draughts and 65 percent boost in thermal performance when compared to single-glazed windows. Secondary double glazing will significantly enhance your property.

Contact us for a Secondary Double-Glazing Quote

For more information about the benefits of our secondary glazing – or to discuss our range of high-performing windows – please contact our experienced team. We will be able to discuss your design objectives in more detail and recommend a suitable product.

If you would like secondary double glazing prices, please use our online quote tool. You can use it as many times you like to generate cost comparisons. Granada has the experience to install your secondary double glazing perfectly the first time, so that it adds long-term value to your home.

Frequently Asked Questions

To what extent will secondary glazing reduce the sound pollution in my home?

Correctly specified and installed, secondary glazing will acoustically outperform all other types of glazing. It is not uncommon to see secondary glazing where double or triple glazing is installed. To reduce noise levels by up to 80% Granada advise the specification of acoustic glass and an air cavity no less than 150mm – 200mm glass to glass.

Reports indicate that a passing diesel bus often creates 85dB of noise. Correctly installed, Granada’s secondary glazing can reduce noise levels by 54dB, a reduction of 54dB will reduce the noise level to 31dB which is the equivalent to a whisper.

How to achieve the best thermal performance?

Draughty windows can make a room feel uncomfortable and will result in higher energy costs as heat is escaping. Secondary glazing, with either 4mm, 6mm or 8.8mm Low E glass, can reduce heat loss by up to 65% and instantly prevent draughts. We often recommend the installation of Low E glass as it has a specifically designed coating that reflects heat back in to the room.

For optimum performance, we recommend that the secondary glazed unit is face fixed to the interior side of your primary window with an air cavity of no more than 80mm. Secondary glazing will decrease the amount of heat loss when installed with single, double or triple glazed timber or uPVC windows.

Here at Granada, we can manufacture our secondary glazed units with or without a hardwood subframe. We advise the installation of a hardwood subframe as this acts as a thermal barrier, preventing the aluminium frame and glass cooling due to the temperature of the fabric of the building.

Please speak with us directly where we can advise which type of glass, product and installation type will yield the best results.

Which Glass type should I choose?

Secondary glazing is normally specified to combat 2 main issues; acoustic or thermal performance. In conjunction with the air cavity, the type of glass specified plays a vital role in rectifying your issue. As standard, all of our products are manufactured with 4mm toughened glass for enhanced security and safety. (Please be aware that other secondary glazing providers may supply float glass which is brittle and can be easily broken. If broken, it can leave large dangerous shards, often resulting in injury).

Here at Granada, we provide several types of glass ranging from different thicknesses to different coatings. Each type of glass has specifically been designed and selected to offer optimum performance.

Sound – Selecting the correct glass and installing the secondary glazed unit with an air cavity of 150mm to 200mm, can drastically reduce noise issues by up to 80% (54 dB). Most traffic noise problems can be rectified with the installation of either 6.4mm or 6.8mm clear acoustic glass. Where noise is a real nuisance, and loud in nature, we suggest the specification of 8.8mm clear acoustic glass.

Thermal – Cold draughts breaching your primary windows can make a room feel uncomfortable and makes it uneconomical as the loss of heat will result in higher energy costs. Where thermal performance is required, we advise the installation of either 4mm, 6mm or 8.8mm clear laminate low E glass. Low E glass has a specifically designed coating that reflects heat waves back into the room thus keeping your it warm in the winter, and cool in the summer.

The type of glass specified can increase or decrease your quoted price. It is best practice to speak with us directly as you may over specify the glass type. We can provide a tailored solution to rectify your issue which is both cost efficient and practical for your specific requirements.

What does the installation process consist of for secondary glazing?

Secondary glazing is installed to the interior side of the room creating little to no mess. Often installations can be completed within 1 hour. We work closely with over 500 national trade installers who will make an appointment to measure and install at your convenience.

What materials are used for the frames?

As market leaders within the glazing industry, it is important that our secondary glazing is high performing and aesthetically pleasing. The key to our approach is to use the best raw materials available and manufacture to the highest standard possible.

All of our frames are manufactured in house from slimline, durable aluminium. We cut, powder coat, arch and fabricate our aluminium frames in house under one roof. Utilising high tech machinery such as CNC machines, we can ensure all frames are built to size as sealed units.

Our knowledge, expertise and skills in manufacturing ensure a high quality and the best performing product. Our competitors have tried to reduce the amount of aluminium within the frames to reduce the cost of raw materials but we found this has a negative effect on the product quality. Reducing the amount of aluminium does decrease the cost. The implications of this make frames and sashes unstable and unable to take the weight of the glass, creating health and safety issues. This also decreases the acoustic and thermal performance of the product.

Granada’s head office holds a team of product developers where they can often be found designing and manufacturing glazing products using new materials and manufacturing techniques. All of our products are quality tested before they leave our facility ensuring a high level of quality and function.

Will I lose the functionality of my windows?

Granada’s secondary glazing is available in many styles complimenting all window types. We have a range of windows that slide horizontally and vertically for easy access and cleaning.

Our hinged unit operates on a hinge mechanism that can be placed on the side of the window for conventional opening or on the top or bottom dependent upon your requirements. Other window styles include fixed windows or lift outs which can easily be lifted out of the frame.

Need Help Choosing the Right Secondary Glazing?

If you have a question about secondary glazing, and what window type is the right choice for your property, please don’t hesitate to contact the Granada team.

Secondary glazing will improve your home’s market value as well as this, secondary glazing will create a safer, more thermally efficient and better looking home.

Benefit from improved market value and make your property more attractive to prospective buyers with additional glazing.

Reward your home with more space. If your home, conservatory or extension is too cold or too hot to spend time in, you’ll be able to turn it into a functional room once again with secondary double glazing that’ll regulate its temperature.

Secondary glazing is durable and discreet, our approved installer network will install your secondary double glazing flawlessly and in such a way that it will add lasting value to your home.

Contact us to find out more and ask us for a free secondary glazing quote.

What Our Customers Say

George in Shrewsbury - Changing the primary windows was not an option, so secondary glazing was the obvious solution to provide the necessary noise insulation.

September 20, 2019

Nicholas in Ickenham - installed secondary glazing in six windows at our grade II listed farmhouse. We are absolutely delighted with the work. Road noise has been eliminated and the secondary glazing fits perfectly as well as looking discreet.

October 14, 2019

Really impressed with the speed and quality of the work. It has made a huge difference to the house.

July 20, 2016

Windows look great, have made a big difference, very polished.

June 24, 2016

Complete process from quote to installation was very smooth. Appointments were always kept on time and goods were supplied as specified. A very professional company fashion.

July 20, 2016


Kimpton Fitzroy Hotel – London

Granada Glazing’s aluminium secondary glazing was specified to attenuate external noise and create a quieter, more comfortable experience for patrons in the 334 individual custom finished guest rooms and 39 new luxury suites.

Ten and Six Wine Bar – Shrewsbury

Granada’s secondary glazing was specified to reduce noise emissions from Ten & Six, which occupies a magnificent black and white Grade II* Listed Building on Mardol in the town centre.


The Paper Hall – Bradford

Originally built in 1643, this Grade 1 listed building was initially intended as a private dwelling. During the English Civil war which ended in 1651 many of the surrounding buildings were destroyed; however, the Paper Hall was able to stand the test of time.


Secondary glazing changing people’s lives

The need to reduce noise levels is a particular concern for homeowners living near busy roads, railways or in city centres. Here Granada’s secondary glazing systems can deliver the optimum solutions that contribute to quieter, warmer and more comfortable buildings.


Colours to Complement all Homes

Granada Glazing’s range of bespoke secondary glazing is available in over 200 RAL colours to complement your home.


Secondary Glazing Noise Insulation – M62 Case Study

Living near a busy road or a noisy motorway can face many challenges, the hardest one to overcome is blocking noise entering your home. Cars and heavy goods vehicles are capable of emitting over 85 decibels which can be detrimental to health.

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