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Last updated: 09 June 2021

Double Glazed Panels: Your Complete Guide for Window Panels

Everything You Need to Know about Double Glazed Panels

As building regulations become stricter and heating costs are rising, it is even more important to ensure the property is as energy efficient as possible. But how do you make your home energy efficient? The simple solution is double glazing, namely double glazed panels. Having double glazed panels brings a multitude of advantages and it is a smart investment.

Panels represent the core element of windows or, in some cases, doors, and selecting the right ones can have a great impact on the home’s value, property’s security, and noise pollution reduction. In order to leverage on all of these pluses, the best solution is double glazed panels. It is a clear path for savings in the long run.

If you’re considering buying double glazed panels but wish to skip the hectic process of researching the best suppliers, all you should do is to fill in our short form at the top of the page. We will provide you with up to 4 quotes from trusted suppliers. Our service is free of charge and there are no obligations.

double glazed panels

Here at GreenMatch, we’ve made every effort to keep this guide as accurate as possible so we can assist you in making the right investment decision in double glazed panels.

How Much Do Double Glazed Panels Cost?

Double glazed panels prices depend on several factors that you should consider prior to your final decision. These include size, type of glass, glass thickness, and gas fills.

Double glazed panels are already energy efficient, but they also need to be viewed as a unit. The frame material that is complementary to the double glazed panels adds value to the energy efficiency, or in some instances they do the opposite. The double glazed windows and double glazed doors are available in different frame materials, and selecting the right one can increase panels’ insulation characteristics.

The common double glazed panels in UK have energy efficient glass, thickness of 4mm and an aluminium spacer bar.

The table below provides an overview of double glazed panels prices. 

Type of Glass Size of Panels Thickness Spacer Bar (6mm-20mm) Price
Standard 1000mm × 1000mm 4mm Aluminium from £36
Standard 1000mm × 1000mm 6mm Aluminium from £46
Energy Efficient 1000mm × 1000mm 4mm Aluminium from £51
Toughened 1000mm × 1000mm 4mm Aluminium from £50
Toughened 1000mm × 1000mm 6mm Aluminium from £100
Toughened Energy Efficient 1000mm × 1000mm 4mm Aluminium from £68
Laminated 1000mm × 1000mm 6.4mm Aluminium from £76
Laminated 1000mm × 1000mm 6.8mm Aluminium from £130

Generally, the prices don’t differ that much, however as we go down to more specific glass types, some significant differences in price might occur. If the cavity is filled with argon gas, then a few extra pounds need to be factored into the initial prices. Furthermore, double glazed units costs may also differ, as the final product incorporates various elements, which ultimately contribute to the overall prices. 

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What Are the Underlying Benefits of Double Glazed Panels?

1. Energy Efficient

As heating costs are continually increasing, installing double glazed panels is a perfect solution for reducing heating bills, and ultimately a smart investment. Statistics point out that approximately 60 per cent of the heat of our homes is lost when using single glazed panels. The low-emissivity (Low E) thermal insulation glass solutions reflect the heat back in our homes and allow the advantage of having free solar energy.

2. Effective Noise Insulation

Double glazed panels are an effective solution at reducing medium to high frequency sound. A difference in the glass thickness between the inner and outer pane helps in the noise reduction. For ensuring an exceptional level of sound the acoustic glass is the best solution.

3. Condensation Reduction

One of the main problems of single glazed panels is the condensation, which can possibly result in the unhealthy formation of mould. By installing double glazing panels the condensation is highly reduced, especially when using Low E panes.

4. Sustainability

From the total of carbon dioxide emissions, more than 26 per cent derive from home energy. In order to reduce your home carbon footprint, double glazed panels is the best solution. As a result, you will produce less carbon dioxide as well as greenhouses gases.

5. Security

Another benefit of having double glazed panels is the security. They offer protection against aggression and plays a vital role against vandalism and infraction.

6. Increase Home Value

As energy efficiency is a huge factor in house prices, it is important that your house is not left at a disadvantage. With double glazed panels installed you can favourably compete with other houses in the market.

double glazed panels stacked

What Are the Components of Double Glazed Panels?

There are 5 main components of a double glazed panel: glass panecavitydesiccant, spacer bar, and seal. Every component ultimately contribute to the overall performance of the panels.

Glass Pane

The glass panes come in different types such as Low-E glass, acoustic glass, safety and security glass. The most important factor to be considered is the Window Energy Rating (WER) scale, which represents the thermal performance of the panels. The WER scale range is from A to G, with A being the most energy efficient and G the worst. Low E glass panes that have the best performance ratings, achieving and A on the WER scale, are a combination of warm edge space bars and argon filled cavity.


Double glazed panels consist of two layers of glass panes which are separated by a spacer bar and seals in order to achieve a perfect hermetically-sealed environment. The cavity width between the two panes is another key factor in the panels rating. The cavity width for a double glazed panels is usually between 4 to 20 mm. The recommended width for a double glazed Low E panel is 14 mm, when is filled with dehydrated air, and 16 mm, when the cavity is argon gas filled. The width for acoustic insulation differs from case to case, as it is highly dependable on the specific insulation requirements.

Spacer Bar

The key component of double glazed panels is the spacer bar. Why is the spacer bar so important you might wonder? Put it in short, a good spacer bar equals increased energy ratings for double glazed panels. The fundamental contributors are the materials used in manufacturing, their flexibility and thermal properties. They are usually made of aluminium or a low heat-conductive material, generally known as warm-edge spacer bar. Aluminium spacer bars are light but strong, highly flexible, and less expensive. The downside however is that they are less effective in insulating heat loss, which subsequently affects the energy efficiency ratings of the double glazed panels. Warm edge bars are specially optimised for thermal efficiency, aiming to minimise the heat loss as much as possible.

A good spacer bar should:

  • block moisture and water vapor that could fog the glass
  • create a dense seal to prevent the leakage of special gas fills
  • absorb stress that results from thermal expansion and contraction
  • increase the temperature of insulated glass edges to help reduce condensation and improve energy efficiency

As a rule of thumb, always pay attention to the spacer bar!

double glazed panels components


The desiccant is a silicon based material which is applied on spacer bars. Its main property is to remove traces of humidity from the cavity. The material helps to prevent the condensation of the double glazed panels. Sometimes this represent a specific process, however manufactures have developed a one single step application process.


The commonly used materials for sealing the double glazed panels are Butyl Hot Melt, Polyurethane, and Silicone. The silicone based material sealant is less expensive as compared with others, but its downside is the limited amount of durability. The best sealing material is Butyl Hot Melt.

Frequently Used Types of Double Glazed Panels

1. Toughened Glass

One of the most frequently used double glazed panels are made of toughened type glass. This is particularly noticeable in windows that are installed on a fair height off the ground. They can be found in most of children’s rooms as well as in patio doors. This can protect against accidents, for instance, if a child runs into it.

2. Energy Efficient Glass 

Double glazed panels that have a high energy efficient rating, use a combination of Low E glass panes, argon-filled gas, and warm edge spacer bars. They allow the sun heat to come into the room, without any heat loss, providing a means to keep the rooms warmer during the winter time.

Having a double glazed panel fulfills the expectations of every homeowner.

double glazed panels production

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