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Secondary Glazing Cost and Benefits: How Much Can You Save?

secondary glazing

Secondary glazing typically costs between £685 and £1,057 

Secondary glazing is twice as cheap as double glazing in some cases

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Secondary glazing is a great alternative for those that can’t quite afford double glazing. It’s cheaper, just as effective, and – if carried out properly – can be fitted yourself. Read on to learn the ins and outs of secondary glazing, including cost, companies and providers, and how to do it yourself.

However, if you’ve got your heart set on double glazing, and all the benefits that come with it, get in contact with our suppliers. Once you’ve filled in the form with your details, our professionals will contact you shortly with quotes to compare!


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Secondary glazing

What is secondary glazing?

Let’s start with the basics – secondary glazing involves installing a pane of glass and frame to an existing window. By simply adding an extra panel of glass to your window, you can avoid the cost of replacing the entire window, which is what often makes double glazing so expensive.

The most attractive benefits of secondary glazing are its energy insulation and soundproofing abilities. On top of this, it’s cheaper than double glazing and is a good option if you can’t replace existing windows, for example, due to living in period or listed properties.

Did You Know?

You can save more than £400 each year, just by switching your home’s energy supplier. If you’re looking to cut down your bills, this one’s a bit of a no-brainer.

That’s why we’ve partnered with Switchd. With four different price plans (including a free option), Switchd will find you cheaper, greener energy suppliers in no time.

Types of secondary glazing

Depending on the style of your house, you’ll want to make sure you get the right type of secondary glazed windows. We’ve listed the main types below:


• Lift-out units: A single pane of glass that goes on top of a fixed window in your home

Its best feature? They are the most cost-effective type of secondary glazing. The ability to lift it out of the frame makes it much easier to clean

• Hinged units: A single pane of glass that is generally used with casement or hinged windows

Its best feature? They are excellent for hard-to-clean areas. These are popular for people who are wanting to insulate their casement or hinged bay windows

• Vertical sliders: These units are normally used on vertical sliding sash windows

Its best feature? Most people choose to add these to their sash windows, as they look very discreet

• Horizontal sliders: These units are normally used with either sash or casement windows

Its best feature? This type of glazing is available in two different styles: slim line (better suited for residential property), and heavy-duty (better suited for commercial buildings)

How much does secondary glazing cost?

On average, secondary glazing can cost anywhere between £100 to £200 per pane – but this will vary, depending on the number of windows you need to upgrade and the type of window you have. It will also depend on whether your motivation is mainly to reduce noise or drafts, as soundproof windows tend to cost more.

It’s worth getting a few quotes from different installers to find the best deal for you – and if you fill in this form, you can do exactly that.

Check out the table below to get an idea of what you can expect to pay for secondary glazed windows:

Amount of windows
Average cost
Duration of job
4 windows
1 day
8 windows
1 day
12 windows
1-2 days

Prices sources from


Secondary glazing costs vs double glazing costs

In comparison to installing double glazing, secondary glazing typically works out cheaper and is quicker to fit.

Compared to the average £100 – £200 to install secondary glazing, you can expect to spend around £250 and £400 for double glazing. So if you are bent on saving and have some room to play with, secondary glazing may be your best bet.


Cheap secondary glazing options

If you're trying to keep the price down on your secondary glazing, you can opt for certain materials. The lowest cost option is uPVC, with aluminium and wood at the most expensive end of the scale. You may also want to look at different types of glass – generally speaking, the thicker, the pricier.

The cheapest type of secondary glazing is draft reducing glass, with prices between £685 and £870. Secondary glazing that reduces noise needs more substance, is therefore most expensive – usually costing between £895 and £1,057 per pane.


Magnetic secondary glazing

Another cheap option is to use magnetic secondary glazing. This is quick and simple to install but still promises the same insulation and noise reduction benefits as permanent secondary glazing. It also costs less than other secondary glazing solutions.

As the name suggests, this glazing uses magnets to attach to the pre-existing window frame. The magnetic strips are self-adhesive and can match the colour of your window so that you do not see them should you remove and store them during warmer months.

The material used to make magnetic secondary glazing is typically P.E.T. (Polyethylene terephthalate) which is a recyclable plastic.

Magnetic secondary glazing can be attached and removed fairly easily which could come in handy during the summer months. Unlike permanent secondary glazing, they do not have the opening and closing function but must be removed in their entirety to open the window.

What are the benefits of secondary glazing?

Secondary glazing can add a lot to your home for a relatively small price – from thermal advances and external noise reduction to improved security. Check out the full list below:


Thermal benefits

Similar to double glazing, having an extra pane of glass can lock in that much-needed warmth. The air gap between the primary and secondary windows acts as an extra insulator, and prevents draughts.

However, different types of glass will have varying levels of thermal efficiency. Low-E glass, for example, minimises the amount of infrared and ultraviolet light that comes through your glass, without minimizing the amount of light that enters your home.


Noise reduction

If you live in a particularly noisy area, secondary glazing could be your answer for a noise-free life. There are three main ways that you can enhance that amount of noise your windows repel:

The thicker the glass, the better. Thick glass provides better performance simply because the noise will have to travel through more material.

Acoustic laminated glass is specifically designed to block out noise, so be sure to look into this (although, this can be more expensive).

The wider the gap, the better. The space between the outer pane of glass and the inner pane of glass will also make a huge difference, as it will being harder for noise to travel through


Reduces energy bills

By barricading heat in your home, secondary glazing will also give your wallet a helping hand. Having a warm, cosy home will mean that reaching for the thermostat will become less of a habit, and eventually, your bills will start to decrease.

Installing secondary glazing is even said to save you up to 60% on your energy bills!


Can be used on listed buildings

Unlike double glazing, secondary glazing is permitted on listed buildings. In some protected homes across the UK, homeowners are not allowed to replace windows – and if they are allowed, they must apply for planning permission.

Luckily for you, secondary glazing doesn’t involve the removal of window frames. The secondary panel is barely noticeable too! This way, you get to preserve the character and charm of your home.


Extra security

To put it briefly, two panes of glass are much harder to break than one. Although this is fairly obvious, there are other ways your secondary glazed windows can keep you safe:

• The secondary window is nearly impossible to open from outside the property

• The frames are often extremely strong and force resistant

• You will have the ability to partially open a sash window and lock it into position

• Laminated glass, even if damaged or shattered, will stay in one piece and stay attached to the frame

• There are always secure, internal locks

Usually cheaper than double glazing

Unlike double glazing installation, you may be able to install secondary glazing yourself. Although this sounds intimidating, it’s actually a really simple process and will save you hundreds on installation costs.

On top of this, secondary glazing does not involve the removal of the existing window, which means it will take your installer much less time to get the job done.


Easy to install

One of the biggest benefits of secondary glazing is that it’s easy to install – so easy that you can do it yourself. All you have to do is follow the DIY kit closely and have the right tools, and you’ll be done in no time.

It’s also recommended that someone assists you with the installation – otherwise you might end up with shattered glass falling to your feet.

Is secondary glazing right for you?

There are five factors to consider when choosing whether to install secondary glazing:

  1. If you live in a period or listed building where you are not permitted to install double glazing
  2. You cannot get planning permission for double glazing installation
  3. You want to retain your original windows, and do not want to alter the external look of your building with modern-looking double glazing
  4. You are on a budget. Secondary glazing is considerably less expensive to install than double glazing
  5. You live on a busy road or in a built-up area. The larger space between window panes makes secondary glazing even more effective at reducing noise pollution than double glazing

Which companies supply secondary glazing?

There are a handful of national, double glazing companies – but who are the topdogs for secondary glazing?



Everest have been in operation since 1965 and produce secondary glazing solutions and installation.

Their frames are made of aluminium and cater for sliding sash windows or hinged systems. Their secondary glazing solutions all come with a 10 year guarantee.


Anglian Secondary Glazing

Anglian have been manufacturing and installing home improvements for 50 years with their British made products.

They make bespoke secondary glazing for all window styles including sash windows. These can be sliding, tilting or hinged systems.


Clearview Secondary Glazing

Clearview is a privately owned business which has been designing and manufacturing secondary glazing systems for over 20 years, in the commercial, residential and heritage and listed building markets.

They produce vertical sliding secondary glazing or hinged systems and can also design bespoke solutions for sash windows for heritage or listed properties.

Next steps

Feeling more sussed on secondary glazing? If you're ready to warm your home a little more, get in contact with a company that you're comfortable with.

If you think your home needs more than secondary glazing, double glazing is a worthwhile investment. You can look forward to heating your home in a more eco-friendly way, being protected from intruders, and removing any unwanted outside noise. You can compare double glazing quotes by getting in contact with our proffessional suppliers.

Whatever option you go for, you can look forward to coming home to a warm, welcoming home.

Beth Howell Writer

Beth has a real passion for green living. She’s been absorbed in eco research for over three years, and has become quite the expert. Whether you’re after a new set of solar panels, a home energy improvement, or you want to catch the latest eco news, she’s got your back.

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