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Home / Home Improvements / Double Glazing

A guide to replacement double glazed window options and costs

Double glazed windows are used on a huge variety of properties. Windows is another name for double glazing. In the UK a huge percentage of people have windows made out of the material UPVC. This is why a lot of people when looking to install new windows at their home will call them upvc windows.

In fact, you will find very few modern buildings that are not already reaping the many benefits that come hand in hand with double-glazing.

The vast majority of UK homes now have double glazed windows, especially as they are renowned for improving the energy efficiency of properties.

What is a double glazed window?

A double glazed window uses two sheets of glass, which are strategically placed with gap between them, in order to create an insulating barrier. Delivering a high level of energy efficiency, double glazed windows are also widely considered as a long-term investment as they will also improve the security of your property and sound proof a wide range of spaces.

The insulting barrier is created by filling the glass panes with heavy inert gas such as Argon, Krypton or Xenon, or in some cases a vacuum. You will also find a huge variety of frame materials, which suit both contemporary and traditional homes.

Although all double glazed windows are energy efficient, they do vary in their energy efficiency, so this is definitely something that you should bare in mind when looking for the right double glazed windows for your property.

How Much Does Double Glazing Windows Cost?

Like many home improvements, the cost of double glazing varies massively and prices are dependent on the company you choose to supply and install your new windows.

With this in mind, it certainly pays to shop around when it comes to finding the right double glazed windows for your property. Recent price comparison research has revealed the average prices for uPVC windows. For a 60x90 UPVC double glazed window it tends to be around £350-£500 and if you are looking for bigger 90x120 windows, you can expect to pay around £525-£750. Of course, where you live in the country and the size of the double glazing company you contact will also affect the price of your replacement windows.

So, if you are living in a small apartment and are looking to change your windows, replacing your windows will cost in the region of £1,400-£2,000, and if you are looking to update your double glazing in a 3 bedroom house where you will need around 12 windows, you can expect to pay a quote for replacement windows that is between £5,250 - £7,500.

But that’s not all… there are a number of other factors that could affect the price of your windows including:

  • The size of your property
  • Your bespoke requirements
  • The choice of style and decor you choose
  • Energy efficiency rating
  • The type of glazing used
  • Grants available 

You will be able to choose from a whole host of window styles, frames, colours, as well as many decorative glass options too. And depending on the company you choose, you can even create your own personal stained glass design! Take a read of our guide to replacement windows to see what else can be customised with your new windows. 

There are also many different frame options to choose from too including:

uPVC frames - These are the most common type of frames in the UK, and are perfect for enhancing a modern home in a contemporary setting. Available in a wide range of sizes, shapes and colours, this type of frame requires virtually no maintenance and uPVC windows are secure and robust. Here's our guide to the top 10 advantages of uPVC windows and uPVC window prices. 

Composite frames - Embracing the very latest innovative technology, composite frames are designed to replicate 19th Century timber windows.

Wooden frames - A great ption for more traditional homes, \ are fantastic insulators, keeping your home warm and snug all year round. However, you will need to maintain them on a regular basis.

Aluminium or steel frames - Strong, lightweight and aesthetically pleasing, Aluminium frames are virtually maintenance free and can be painted in any colour to suit the style of your home.

Read our guide for a more in-depth comparison of the replacement window materials that we offer.

Of course, you should always shop around and do your research! Most reputable double-glazing companies will also be more than happy to provide you with examples of their work, so don’t be afraid to ask for case studies or testimonials.

Why use double glazing?

There are many benefits that come hand in hand with double glazing windows and doors and although double-glazing isn’t a cheap investment, in the long run, you will reap many financial rewards.

This is because double glazing is renowned for saving you money by reducing your energy bills by retaining 10% more heat in your home. But that’s not all… double-glazing will also significantly improve the security of your home, which in turn, could also save you money on your insurance premiums.

Advantages of investing in double-glazing

Warmer during the winter months - When the weather is freezing outside, there is no better feeling than escaping the cold in the comfort of your own home, right? And double-glazing is ideal for keeping the heat inside your property. But that’s not all… double glazed windows can also store a large percentage of heat from the winter sun, meaning you won’t have to keep your heating on for as long during the winter months. This also means you will be able to reduce your energy bills and improve your carbon footprint.

Reduce noise -; One of the main advantages of double-glazing is that it can also significantly reduce outside noise, allowing you to enjoy a warm, quiet and tranquil space. After all, if you live by a busy road or in the heart of the city, noise pollution can often be an issue. The good news is high quality double-glazing can reduce outside noise by up to 60%!

Increase the value of your home -; Investing in double-glazing is a great way to increase the value of your home, especially in older properties.

Reduce condensation - Condensation can be a major problem in a wide range of properties, especially in older homes where mould and mildew can cause significant damage. However, double-glazing is a great way to prevent and reduce excess moisture forming on your window frames and other areas of your home.

How to find the best double-glazing suppliers in the UK

Purchasing double-glazing is one of the biggest investments you can make in your home. With this in mind, it’s important that you take the time to do your research when it comes to weighing up your options and choosing a reputable company that will offer you the best value for money.

You will quickly discover that there are hundreds of companies up and down the UK, so it’s vital that you take the time to compare direct quotes to ensure that you are able to get the very best deal for your needs.

Read our guide on how to make sure you choose the best double glazing installer in your area. 

Here are our top tips on choosing the best double-glazing supplier in the UK.


Reputation is everything, especially when it comes to home improvement companies. After all… entrusting anyone to make adjustments to your home is a big deal. With this in mind, as part of your research, you should ask the companies you contact for customer reviews and testimonials, as these will speak volume about the type of company they are and the quality of their work.


A reputable double glazing company will always offer a guarantee, which is always at least 10 years, so make sure you check!

Check accreditations

Again, this is something that you should be aware of when it comes to looking for a double-glazing supplier operating within your area. As a general rule of thumb, you should always opt for a FENSA double-glazing registered company as this is the industry standard for compliance with building regulations associated with replacing window and doors.


Thanks to advances in technology, windows and doors are now more secure than ever before, and a reputable, customer focused company will offer doors and windows that boast the latest security features.

Best value for money

Upgrading your windows is a big investment, and when researching double glazing companies, you should pay close attention to whether or not you are getting the best value for money. You’ll probably find that smaller, local double-glazing companies charge less than larger companies, as they have fewer overheads and tend to offer a higher quality service without the high price tag!


Performance is key when it comes to optimising efficiency, durability and longevity. With this in mind, check out the brands the company uses in order to gauge the quality of materials. After all, if the double glazing company you have touched base with use low quality materials, this could end up costing you more in the long run if you have to cover the costs of repairs and maintenance.

Energy rating A+

All properties lose heat, which is why it is so important to incorporate energy efficient solutions into your home, especially when it comes to optimising comfort and keeping your bills down! With this in mind, make sure that the double glazed windows you choose have an energy rating of A +.

The key to finding the best double-glazing company is to shop around. Every homeowner has different requirements and budgets, so by doing your research, you’re sure to find a company that is right for you!

How much could you save with double glazed windows?

Double-glazing is an excellent investment, especially when it comes to saving you both energy and money!

This is because double-glazing is constructed in a way that offers a high level of thermal insulation in your home due to its airtight components, which help to reduce the flow of heat in and out of your property. This means that you will need less energy to control the temperature of the spaces inside your home.

And of course, this also means that you will be able to make significant savings on your energy bills too, which is always a bonus! In fact, it is estimated by the Energy Saving Trust (EST) that if the whole of the UK invested in double-glazing windows, they could collectively save around £700 million in fuel bills.

However, you should also be aware that different types of double glazing will provide different levels of energy savings, so it’s definitely worthwhile investing in double glazing windows with a higher energy rating in order to save money on a long term basis.

What’s the lifespan of double-glazing windows?

This depends on the quality of the windows, the materials used, the depth of cavity between inner and outer pane, and the installation process, which is why it’s important to always do your research. Generally your windows should last at least 20 years!

What to look out for in a new window

Your new windows should not only keep you safe, warm and secure, but they should also be aesthetically pleasing and complement the style of your property!

So when it comes to buying your windows, there’s a lot to look out for and consider.

The best double glazed windows, should allow you to enjoy the following benefits:

  • Allow a good amount of light into your home
  • Be aesthetically pleasing
  • Easy to maintain and clean, without it costing the earth
  • Add significant value to your property
  • Come complete with glass that cannot be removed from outside of the home
  • Fit your property perfectly
  • Keep out draughts
  • Withstand the demands that come hand in hand with everyday life
  • Withstand natural elements and severe weather conditions
  • Optimise security with multi-point locks and mechanisms
  • Have a high energy rating to reduce energy bills
  • Add value to your home

Disadvantages of double-glazing windows?

As you can see there are many advantages of double-glazing windows, making them a sound investment for any property.

The only disadvantage of double glazing windows is that they can be difficult to repair, which is mainly due to the air tight space between the two panes, which if broken, can cause condensation to form between them.

However, the vast majority of double glazing companies offer a 10 year guarantee, and your windows should last for at least 20 years if you choose the right supplier!

Double glazing is not easy to break, so you know that your home will be secure. The argon gas within the double glazed window panes works as shock absorbers, which means your double glazing is difficult break. 

Double glazing prevents heat loss in your home to make it more energy efficient. It also has excellent sound insulation properties and keeps your home safe and secure. This makes double glazing highly desirable. 

Double glazing has an average lifespan of around 20 years. This will depend on the materials and the specifics of the installation. The energy efficienct improving argon gas will eventually leak out over time. 

Double glazing makes your home more energy efficient by keeping in the warm air and keeping cold air out. Your home will also stay cooler in the summer. Double glazing insulates from outside noise too. 

Double glazing is a significant upgrade to single glazed windows. Triple glazing may be worthwhile if you live on a very busy road or under a flight path. But double glazing offers many benefits for all homes. 


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