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Last updated: 12 January 2024

Double Glazed Windows: A Complete 2024 Guide

Double glazed windows

Windows are an essential part of any household as they provide lighting, insulation, and ventilation. For this reason, double glazed windows are worth considering since they offer a variety of benefits such as improved insulation for heat retention while also reducing noise pollution.

However, the wide range of options on the market may make the search for the best double glazed windows an overwhelming task and it can take quite some time to figure out where to start.

For this reason, we’ll guide you through all there is to know about double glazed windows. Our guide covers everything you need to know, from the pros and cons of double glazed windows to the different styles and frame materials available.

We also offer a service to help you find the best double glazing companies in the UK. We understand that choosing the right installer can be overwhelming, so we’ve researched the best so you don’t have to. We maintain a vast network of highly reputable double glazing companies which means you don’t have to spend days calling up and researching every installer.

Our service can help you compare quotes from the best double glazing installers in your area to get the best deal. All of our double glazing quotes are free and non-binding. All you have to do is fill out a 30-second form and we’ll provide you with up to 4 options. There’s no need to spend hours researching on your own. Simply click the button below to get started!

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What is double glazing? 

Double glazing is a type of window that consists of two glass panes with a small gap between them. The gap is typically filled with air or an inert gas like argon, which acts as an insulator. The two panes of glass are sealed together to create an airtight unit, which helps to reduce heat loss and noise transmission.

So, what are double glazed windows and what makes them better than single glazed windows? It’s ultimately a matter of saving more on your energy bills due to insulation. The extra thickness also provides enhanced security for your home. They are also better at noise reduction so you can rest assured you’ll sleep well at night.

Double glazed window diagram

The diagram below shows how double glazing works:

Double Glazed Windows
1 2 3 4

How does double glazing work? 

If you’re wondering “how do double glazed windows work?”, here’s a brief run-down:

The two panes of glass are separated by a spacer bar, which keeps them a set distance apart. The spacer bar is filled with a desiccant material, which absorbs any moisture that may be present inside the unit. The desiccant material helps to prevent condensation from forming on the inside of the window.

The opening between the two panes of glass acts as an insulator, reducing heat loss and preventing cold air from entering your home. The insulating properties of double glazing keep your home warmer in the winter and cooler in the summer.

Comparing double glazing to triple glazing and secondary glazing

Triple vs double glazing

Triple glazing is similar to double glazing but with an additional pane of glass. Triple glazing is 30-50% more expensive than double glazing but offers even better insulation and noise reduction. The extra pane of glass and the wider gap between the glass panes help reduce heat loss and noise transmission even more.

Secondary glazing involves adding a second pane of glass to the inside of an existing window. This can be a cost-effective solution for homeowners who want to improve their windows’ energy efficiency and noise insulation without replacing them entirely. However, secondary glazing is less effective than double or triple glazing and may only be suitable for some types of windows.

Is triple glazing always better than double glazing?

Overall, triple glazing is a better choice when it comes to performance than double glazing (on paper). But the question of whether that high quality of performance suits your needs is a different subject.

There are many different types of double glazing and in case some improvement is needed (thermal insulation, energy savings, safety and noise reduction), choosing the right pane of the double glazing will do the trick.

The usage of triple glazing will be needed in more extreme environments, where the building is exposed to harsh noise impacts or harsh weather environments.

Monika Zoksimovska

Monika Zoksimovska is an Expert Contributor for GreenMatch since March 2023. She is a Master of Architecture with great experience in designing and implementing innovative and energy-efficient glazing solutions for various projects. Her portfolio boasts a diverse range of residential, commercial, and institutional buildings.

A popular alternative to triple glazing you can consider is double glazing which inserts a thin film glaze in the mid-point of the unit. The CUIN glass will perform the same as triple glazing for a fraction of the price and with 33% less glass. Currently, this is only offered by a few suppliers across the UK.

How much do double glazed windows cost?

Modern double glazed windows can cost anywhere from £160 to £1,550. The main determinants of cost are size, material, and the design of the windows. The table below breaks down the prices across various popular styles of windows.

Double glazed window prices
Window typeuPVCAluminiumWood
Casement£160 – £825£210 – £1,075£240 – £1,075
Sash£240 – £1,240£315 – £1,615£360 – £1,860
Tilt & Turn£200 – £1,030£265 – £1,345£300 – £1,550
Bay (3 panels)£1,190 – £1,800£1,550 – £2,340£1,785 – £2,700

Cheap double glazed windows can cost around £250 but they may not be made of the best insulation materials. Small double glazed windows are also cheaper but you may have to sacrifice adequate lighting. Triple glazing can add an extra 30% to 50% to the price tag.

Double glazing window styles

There are several styles of double glazed windows to choose from, each with unique features and benefits. Take a closer look at some of the most popular double glazing window styles below.

Casement windows 

double glazed casement windows

Casement windows are one of the most famous styles of double glazed windows. They are hinged on one side and open outwards, providing excellent ventilation and easy access for cleaning. It’s available in various materials, including uPVC, timber, and aluminium. They are also available in various colours and finishes, so you can choose a style that complements your home’s existing decoration.

Sash windows 

double glazed sash windows

Sash windows are a traditional style of window that is still popular in many homes today. They consist of two panels that slide vertically and are often found in older period properties.

However, sash windows are more complex to design and manufacture. The manufacturing process involves several components, including pulleys, cords, weights, and counterbalances, to ensure the smooth operation of the sliding mechanism. This complexity results in higher production costs, which are ultimately passed on to the consumer.

Sash windows are available in double glazed versions and can be made from various materials. While sash windows can be more expensive than other styles of double glazed windows, they offer a timeless look that is perfect for period homes.

Tilt and turn windows 

tilt and turn window

Tilt and turn windows are a versatile style of double glazed window that can be opened in two different ways. They can be tilted inwards for ventilation or turned fully for easy cleaning and access.

Tilt and turn windows are ideal for modern homes and are often found in apartments and high-rise buildings. They are available in various materials, including uPVC, timber, and aluminium. 

French windows 

double glazed french windows

French windows are a stylish and elegant style of double glazed windows that are perfect for homes with a view. They have two panels that open outwards and are often found in living rooms and bedrooms.

French windows are available in various materials, including uPVC, timber, and aluminium. They are also available in various colours and finishes, so you can choose a style that complements your home’s existing decoration.

It’s also complex to design and manufacture. The manufacturing process includes several components, including hinges, handles, and locking mechanisms, to ensure the smooth operation of the doors. This complexity results in higher production costs, which are also ultimately passed on to the consumer.

Bay windows 

double glazed bow windows

Bay windows are a classic style of double glazed windows perfect for adding character and charm to your home. They consist of three panels that protrude from the wall, creating a curved or angled shape.

One of the critical advantages of bay windows is that they provide additional interior space, which can be used for various purposes. You could create a cosy reading nook, a spot for indoor plants, or even a small dining area, all while enjoying plenty of natural light and a unique view of the outside world.

Bay windows are available in various materials, including uPVC, timber, and aluminium. They are also available in various styles as they can include anything from simple casement windows or floor to ceiling windows. Therefore, you can choose a design that suits your home’s architecture.

Bow windows 

double glazed bow winodws

Bow windows are similar to bay windows but with more panels. They consist of four or more panels that create a curved or angled shape. Bow windows are perfect for adding light and space to your home and are available in various materials, including uPVC, timber, and aluminium.

In the end, there are many different styles of double glazed windows, each with unique features and benefits. But if you need clarification on the different windows available, you should contact a professional. While this can usually take days of rigorous research, our service can streamline that to a couple of minutes. With our extensive network of trusted installers, you can be confident you’ll get the best deal on your preferred style.

And the best part? Our service is absolutely free! We’ll provide you with free quotes for the best double glazing windows deals so that you can find the perfect fit for your budget without any added stress or pressure. Click the button below to get started, and we’ll help you find the perfect windows today.

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Double glazed window materials

Double glazed window materials

When it comes to double glazed windows, there are a variety of materials to choose from, each with its own unique characteristics and benefits. But in this section, we’ll look closer at the most popular materials for double glazed windows: uPVC, wooden, and aluminium.

Double glazed uPVC windows

uPVC, or unplasticised polyvinyl chloride, is a popular material for double glazed windows. This material is known for its durability and low maintenance requirements, making it a great option for homeowners who want a long-lasting and hassle-free window solution.

uPVC windows are also energy-efficient, providing excellent insulation to keep your home warm in the winter and cool in the summer. They are available in various colours and finishes, so you can choose a style that best suits your home.

Double glazed wooden windows

Wooden double glazed windows are a popular choice for homeowners who want a traditional or classic look for their homes. Wooden windows provide excellent insulation, making them an energy-efficient option for your home.

They are also durable and long lasting, especially when maintained properly. Wooden windows require regular maintenance, including sanding, repainting, and resealing, to ensure they remain in good condition.

Double glazed aluminium windows

Aluminium double glazed windows are a modern and stylish option for homeowners who want a contemporary look for their homes. Aluminium is a lightweight, strong, and durable material that is resistant to corrosion, making it a great option for homes in coastal areas. Aluminium windows are also low-maintenance and energy-efficient, with a sleek, slimline design allowing maximum natural light.

For homeowners who want to maintain the traditional look of their home, heritage aluminium windows are also a great option.

At GreenMatch, we can help you find the best double glazing installers for your replacement double glazed windows. Our team of trusted professionals is ready to provide you with exceptional service. We guarantee a hassle-free experience as you get a quote from us, which is completely free with no obligation.

We will provide you with up to 4 quotes in just a few moments from our vast network of professionals. This way, you can select the one that best suits your needs. To begin the process, simply click the button below and fill out the form. Our team will handle the rest.

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What are the pros and cons of double glazing?

Double glazing can be a great option since it involves two panes of glass separated by a vacuum or gas-filled space. However, like any home improvement, double glazing has its pros and cons. Let’s take a closer look at them:

pros and cons of double glazing

Advantages of double glazed windows

Improved energy efficiency: Double glazing offers better thermal insulation which leads to higher energy efficiency in homes. This can significantly reduce heating bills.
Noise reduction: The thicker glass allows for better noise reduction and lets you sleep easier at night.
Improved security: Thicker glass also means better durability and harder-to-break windows. Single panes can be flimsier in comparison.
Increased home value: Double glazed windows increase the value of a home as they enhance its energy efficiency. This is a good draw for potential buyers.
Reduced condensation: Double glazed windows allow less condensation into homes and the sealed structure prevents temperature drops from the condensation.
Variety of styles: As it has become the standard for most houses, double glazed windows are available in every window style available.

Disadvantages of double glazed windows

Initial cost: The upfront cost of double glazing is more expensive than a standard window. However, this should always be measured against the savings on energy bills you might get in return.
Professional installation required: Inadequate installation can be bad for your windows and your home heating. That’s why it’s important to look for a well-regarded professional installer when fitting double glazed windows.
Repairs: As with installation costs, repairs can also be more expensive if something were to happen to the windows. Aside from window damage, putting in the inert gas may take some extra work.
Potential condensation between panes: If the seal on your windows is failing, you may experience some condensation in your windows. This can lead to moulding and may even be unhealthy for you.

However, while there are benefits to using this option, it also comes with a higher upfront expense and may necessitate the services of a qualified professional for installation and maintenance. Homeowners should weigh the pros and cons before deciding, but double glazing is worth considering for those looking to improve their home’s comfort and value.

Get the best double glazing windows deal

Investing in double glazing windows is a great way to improve your home’s energy efficiency and overall comfort. However, finding the best double glazing windows deal can be daunting, with so many options and prices to compare.

If you’re wondering “Where can I get double glazed windows near me?”, that’s where our service comes in. At GreenMatch, we can connect you to professional installers in your area, providing you with accurate quotes so you can find the best double glazing windows deal for your home.

By comparing quotes from multiple installers, you can ensure you get the best possible price for your double glazed windows. Not only can you save money, but you can also ensure that you are working with reputable installers who will provide you with high-quality products and services.

Moreover, it can take days of rigorous research to find the best installers and prices. Our service makes it quick and easy to compare quotes from multiple installers and make an informed decision about your double glazing windows without any extra pressure (all our quotes are free and non-binding).

Click the button below and fill in the 30-second form, providing us with some basic information about your needs so we can provide you with the best prices from professional installers in your area. We’ll get you up to 4 free, non-binding quotes so you can decide what works for you.

So, if you’re curious about double glazed windows prices in the UK or want to find the best double glazing windows the UK has to offer, simply click the button below to get started.

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Kathleen Hegwood
Written by Kathleen Hegwood , Writer

Kathleen is a highly skilled copywriter employed by GreenMatch, with extensive experience in the areas of SEO, email copy, and technical writing. Her professional background includes several years of involvement in research, analysis, and content creation. With a strong emphasis on SEO, Kathleen excels in developing well-researched and comprehensive content for businesses across various niches.

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