Double Glazed Windows

With the winters getting longer and colder, is it time to upgrade to your windows and is it worth the cost? If you regularly hear noise from outside world or if it takes time to warm your home during the winter months, even though your bills are incredibly high, then your windows are probably not as efficient as you think. In this case, there is an effective solution for you – double glazed windows.

What’s In This Guide?

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When it comes to your home, windows are one of the most vital parts of your house. Installing the right windows will bring you numerous benefits and can play an essential role as regards the comfort and functionality of your home. If you want to improve the comfort and energy efficiency of your building, double glazed windows are the perfect option.

What Are Double Glazed Windows?

Double glazing consists of frames (uPVC, timber or aluminium) and two panes of glass with a space of 12 to 16 mm between them. There is also a spacer bar that keeps the glass sheets apart to create the gap, which is sometimes filled with air or, more often, with argon gas.


Double glazing is also referred to as insulated glazing. By trapping the air between the panes of glass, it provides a high level of insulation which significantly reduces the level of noise and hot or cold air.

There are alternatives to double-glazed windows available on the market, which can provide an even a higher level of insulation. And simply put, the more layers of glass your windows have, the better insulation you’ll get.

In terms of energy efficiency, double glazing is becoming more and more popular. They are available in multiple shapes, styles, sizes and materials. But what is more important, they are eco-friendly as will they significantly decrease your carbon footprint.

How Much Do Double Glazed Windows Cost?

When choosing a type of double glazed window, you should take into account several factors. First of all, you should consider what style of window you would like in your house as well as the number of windows you need. Besides, the material of the frames and type of the glass differ in price. Therefore, they will determine the final cost.

The most popular material used to manufacture double glazing, is uPVC due to its efficiency and lower price. There are also aluminium and timber window frames. However, they are more expensive and perhaps not as functional as uPVC.

The most popular types of double glazed window are sash and casement, whilst the most affordable type of windows are casement, unlike the dual turn style which is usually the most expensive.


For those who are think that this may be out of their budget, secondary glazing is another great option.

Insulated Glazing: The Pros and Cons

Each of the different types of double glazing has it’s positives and negatives but I want to give you a some of the general points that are common to all the various options.

Double-Glazed Window Advantages

  • A double glazed window provides great insulation and you will be able to keep up to 70% more heat inside your home than with single glazed windows. So you can save money on energy bills.
  • Compared to single glazed windows, double glazing is significantly stronger meaning it any would be burglars will have a hard time breaking in. And we should never underestimate the benefits of a bit more peace of mind..
  • And they won’t just keep you warmer, double glazed windows are also a great soundproof. and reduce outside noise by up to 60%. This is great for homes in urban areas near busy roads.
  • Too much sunlight coming in through the windows can damage your furniture, carpeting and other interior items. But with double glazing, the amount of harmful UV sun rays is significantly reduced.
  • They add value to your house. So, if you ever decide to sell in the future, you can get a better deal, and the initial investment will pay off significantly.
  • Double glazed doors and windows are environmentally friendly. By reducing your energy consumption you are also reducing your carbon footprint and helping to build a brighter future.

Double-Glazing: Disadvantages

Like anything in life, it’s not all good, there are some small drawbacks to consider before making a purchase too. b

  • During the summer months, double glazed windows may just work against you. Warm air trapped inside might make for an uncomfortable room temperature.
  • Double glazed doors and windows are sealed and can’t be taken apart. If the seal is damaged and condensation builds up between the glass sheets, their effectiveness will be reduced. Unfortunately, this can’t be repaired and you will have to replace the entire double glazed unit.
  • The modern white uPVC windows don’t always suit old homes and can look out of sync. You can still find companies that manufacture double glazing in wood and other materials and styles, but beware of a higher price.
  • The manufacturing of double glazed windows uses more materials and a more complicated process. And you pay for that. But you should see it as a once off, long-term investment that will pay off in the future by reducing bills and increasing your home’s value.

The Composition Of Insulated Glazing

Double glazed windows are combined of six main parts:

  • Primary Seal
  • Secondary Seal
  • Two glass panes
  • Cavity
  • Spacer bar

Sometimes, they may also contain a desiccant between the glass sheets that absorbs the moisture and prevents condensation. Additionally, you can have your windows transparent or coated with a tinting film or reflective layer.

There are a few factors that influence the insulation. First of all, two panes of glass keep the heat inside the house better than one. Second, the air trapped between the glass sheets poorly conducts heat which also prevents it from escaping.

The coating reflects the sun rays reducing the amount of sunlight coming into the room effectively preventing the room from heating up.

Why Install Double or Triple Glazed Windows?

There are a great many reasons to take the leap add double glazed windows to your home. They are an effective solution to keep your house warm and improve your home’s soundproofing. By upgrading your home’s windows, you’ll have a more comfortable and safer home.

With the insulating power of double glazing, you can make your home more energy efficient and save over a £100 a year on your energy bills. Besides, it’s essential to have a quiet and peaceful atmosphere when you come home. Double glazed windows are great at reducing the noise pollution which can cause a lot of stress and negatively impact your well-being. Additionally, they are designed to be strongdurable and difficult to break through which enhances your safety and prevents a break-in.

Types of Double Glazed Windows

There are multiple types of double glazed windows that you can choose from based on your individual requirements. They come with various types of glass, materials that the window frames are made of as well as styles, shapes, spacer type and the filling between the glass panes.

Glass Types

Low E Glass

Low E or low-emissivity glass is used for thermal insulation purposes in double glazed windows. It is the best fit for the cold areas with the intensive use of heat in the houses. This type of glass improves the energy efficiency in the house and helps lower your energy bills.

Acoustic Glass

The purpose of acoustic glass is to reduce the amount of outside noise entering the house. It consists of two or more glass panes that are connected with the acoustic interlayers. They refer to the use of polyvinyl butyral (a resin-based plastic) that decreases the level of sound.

Self-Cleaning Glass

With the development of the technology of uPVC windows, self-cleaning glass has become available. This type of glass is covered with a transparent coating which helps dissolve the dirt and evenly cover the surface with water.

Safety Glass

Tempered and laminated safety glass was developed to prevent injuries in case the glass breaks. If a safety glass is broken, unlike standard glass, there won’t be any shards or splinters.

Fire Glass

Fire glass is an efficient solution to protect the premises from fire, smoke and odours. It uses tempering and laminating technologies which make it resistant to gas, fire or smoke.

Security Glass

Security glass is usually a laminated glass with the PVB interlayers. This is what makes them tougher and gets security to a different level. It helps protect your house from a break-in or any other form of vandalism or aggression.

Decorative Glass

With decorative glass, you can customise the appearance of your windows in multiple ways. It can be combined with other types of glasses used for double glazing allowing you to create a unique look with any patterns, colours, or textures you like.

Solar Control Glass


Solar control glass allows natural light to come into the room while filtering and reflecting the sun rays that can cause uncomfortable glares. It can be a perfect option for buildings with large open areas.

Types of Insulated Glazing Frame Materials

The most common materials used for double glazed windows frames are aluminium, timber and PVC. All three have different features and insulation properties, that’s why it’s essential to choose the right type of material for your windows.

Aluminium Frames

Aluminium double glazed frames are very strong and durable. They also pretty low maintenance and are considered secure. However, they are not very popular due to a higher price and lower insulation qualities.

Timber Frames

Timber frames can be manufactured from a variety of hardwood. They can last for a long time and fit best with older architectural styles, with a more traditional look. They can provide an attractive look to your house, but are more costly than uPVC windows. They also require more maintenance.

uPVC Frames

PVC (or uPVC) is by far the most popular material used for double glazed window frames due to their many advantages to uPVC frames. Among the other types of material, they are the most affordable. Besides, they are designed to last for a long time and provide a high level of insulation. They are easy to maintain and come in a variety of colours, patterns, and styles.

The Spacer Bar

In insulated windows, a spacer bar is a frame that is used to separate the two sheets of glass to create a gap that will be filled with air or gas. Generally, spacer bars are manufactured of aluminium or another low-heat-conductive material.

Aluminium spacer bars are the most commonly used due to their durability, price, flexibility, and strength. However, in terms of insulating against heat low-heat-conductive material is more effective.

Spacer bars are also available in a wide variety of styles and shapes so that they can fit any type of double glazed window, for example, tilt and turn windows, casement windows, sash windows and more.

Insulated Glazing Manufacturers in the UK

When you are planning to install new windows in your home, double glazed windows are a smart investment for any type of house. So it is essential to find a trustworthy and reliable double glazing company that can provide you with professional and high-quality services.

Double glazed windows can be complimented with double glazed doors for a better building seal.

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Last Updated on October 28, 2021


Author: Indra Gupta

Indra is an in-house writer with a love of Newcastle United and all things sustainable.

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