Call us today on: 01909 499 899

Secondary Glazing Sash Windows

Vertical Sliding Secondary Glazing

Secondary Glazing designed to match the look and function of traditional box sash windows

Keep the Noise Outside

Granada’s secondary glazing can reduce noise levels by up to 80%

Increase Window Security With Locks

Granada’s secondary glazing can be locked to enhance security

Secondary Glazing For Period Homes

Secondary Glazing can be installed with conservation areas and listed properties

Vertical sliders are used in conjunction with traditional box sash windows. With our secondary glazing sash windows, a tilt in option is available which enables both panels to individually tilt into the room for easy cleaning.

Secondary Glazing Sash Windows for Heritage and Modern Properties

Secondary glazing sash windows are the perfect, thermally efficient, solution for owners of heritage homes. This is a vertical sliding secondary glazing that fits on the inside of a vertical sliding sash window to help improve its heat performance.

Listed properties often find that they are unable to replace their sash windows with modern double glazing. This is because it can affect the traditional outer appearance of these buildings. Secondary glazing sash windows on the other hand, sit discreetly on the inside. They function in the same way as double glazing but without impacting the façade.

In addition to this, our modern secondary glazing sash windows offer a number of great benefits when installed to a modern home. As a result, they aren’t just perfect for heritage properties but also modern buildings that want that vintage look which only sash windows can provide. Enhance your property both visually and thermally.

Panel Options for Vertical Sliding Sash Windows

Balaced Vertical Slider

Balanced Vertical Slider (BVS)

Tilt-In Balanced Vertical Slider (TBVS)

Tilt-In Balanced Vertical Slider (TBVS)

Clear Benefits of Vertical Sliders

65% reduced heat loss

Using 4mm toughened Low E glazing, with 80mm glass-to-glass optimum U Value: 1.868 W/m2K.

80% noise reduction

Using 6.4mm acoustic laminate glazing, with 200mm glass-to-glass optimum Noise Reduction: 52dB (Rw).

What are the Benefits of Secondary Glazing Sash Windows?

Vertical Sliding

Features of Secondary Glazing Sash Windows

As mentioned before, secondary glazing sash windows are perfect for improving the thermal performance of any property. In fact, our vertical sliding secondary glazing will give you up to a 65% reduction in heat loss.

Moreover, you can also reduce the amount of noise you get inside the property. For educational institutions and hotels where a peaceful environment is desired, our secondary glazing for sash windows can provide up to an 80% decrease in noise pollution.

If you simply seal the windows shut, you can increase the amount of moisture inside the building. This can lead to condensation and, consequently, mould and mildew. Secondary glazing sash windows, on the other hand, takes ventilation into account. As a result, your property retains the warm and comfortable temperature without leading to unhealthy damp issues.

Vertical Sliding Windows

Easy Usability with Secondary Glazing Sash Windows

Secondary glazing sash windows are designed especially for vertically sliding windows where regular hinged panels aren't suitable. In fact, these are specifically modelled along the same lines. There are two secondary sashes, one above the other, securely retained in their outer frame.

The vertically sliding secondary glazing is supported by robust spring balances. What these do is provide ease in opening and closing.

In addition, the spiral balance system supports the weight of the secondary sashes. As a result, these secondary glazing sash windows are quite suitable for larger sash windows as well.

Another excellent feature vertical sliding secondary glazing offers you is the tilt-in facility. This feature allows each secondary sash to be independently released from the outer frame. It can then be pivoted inwards through almost 180°. As a result, you will find it as easy to clean the outside of the glass as it is to clean the inside.

Additionally, the sightlines of secondary glazing sash windows are designed to match traditional sash windows. The sashes are also easily moved up and down with the weights supported by the balance system.

Vertical Sliding Windows

Secondary Glazing Sash Windows Tailored to Your Needs

Our secondary glazing is designed to give you the look and the qualities that you value the most. This is why our secondary glazing sash windows can be customised to your needs perfectly. In fact, our local partners will even ensure that they are delivered and installed at the time most convenient for you.

We offer you a full spectrum of RAL colours that you can pick from to get secondary glazing sash windows that match your home. Match them with your décor to get a stylish feature, or have them blend with your window frames, so they are unobtrusive. Additionally, you can also choose the kind of glazing you want. We offer a range of 4mm-8.8mm glazing that will fulfil your thermal requirements as well as helping you reduce the noise in your home.

YYou can even decide whether you want them face-fixed or reveal-fixed, based on your preference. The best part is, our innovative secondary glazing sash windows are designed to be extremely easy to clean.

Since all our windows come with a 5-year guarantee, you get complete peace of mind, knowing that your secondary glazing sash windows will perform exactly as promised.

Features of Secondary Glazing Sash Windows

5 Year Warranty

5 Year Warranty

All windows come with a five-year warranty on frames and glazing.


Local Delivery

Our local partners can deliver and install at your convenience.

RAL colours

Choose From 200 Colours

Aluminium frames can be finished in the full range of RAL colours.

Bespoke Range of Glass

Glazing can be specified from 4 - 8.8mm, to meet thermal and acoustic demands.

Cleaning and maintenance

Simple to Maintain

Cleaning and maintenance is made simple with easy to lift out panels.


Discreet Installation

Windows can be face-fixed or reveal-fixed, to suit your preference.

Maximum frame sizes

Width (Maximum)
Height (Maximum)
TBVS – Tilt Option with no Restrictor
Larger sizes are available upon request, sizes based on 4mm glass (other types of glass are available upon request)
Width (Maximum)
Height (Maximum)
HTBVS – Tilt Option with Restrictor
Larger sizes are available upon request, sizes based on 4mm glass (other types of glass are available up on request)

Our Testimonials

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

Secondary Glazing Sash Window Prices

If you want secondary glazing sash windows for your property and are looking for prices, get in touch with us for a no-obligation quote.

Our expert team will be happy to discuss your needs and specific requirements to give you a tailored quote. They will also answer any questions you may have about our range of secondary glazing and the options you have.

Request a Free Secondary Double Glazing Quote – 2 Simple Steps

Secondary Glazing FAQs

What Is The Installation Process For Secondary Glazing?

Secondary glazing is installed to the interior side of the room creating little to no mess. We can often complete installations 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 essential 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 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 product quality. 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 glazing is available in many styles complimenting all window types. This way, you will still be able to use your original windows all year round. 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.

What Are The Advantages Of Secondary Glazing?

There are many benefits to secondary glazing! This type of glazing offers the most effective sound insulation, reducing noise levels by up to 80%. Secondary glazing also improves heat insulation and reduces heat loss through the window by around 65%. Secondary window glazing is an excellent value for money.

Are there any Guarantees or Warranties?

In the unlikely event of a malfunction, our secondary glazing is backed up with a five-year warranty on frames and glazing; and a two-year warranty no moving parts. The majority of our elite trade network are members of FENSA. FENSA is a governing body where tradespeople and installers can self certify that their installations comply with current building regulations. In the unfortunate event of a malfunction, please speak with our customer care team by telephoning 01909 499 899.

Can you Install Secondary Glazing for Sash Windows?

Secondary glazing sash windows are often a popular choice. Perfect for both modern and traditional styles of property, a secondary glazing sash window still allows for excellent airflow and ventilation throughout your home.

What Style of Secondary Glazing Should I use for Sash Windows?

A secondary glazing sash window would be the best option if you already have sliding sash windows installed. These vertical sliders have the same functionality as a sliding sash profile so you still have full functionality of your windows. This means you can still access your window easily for cleaning, and you can simply slide them open to allow for excellent ventilation throughout your home.