Double glazing, also known as insulated glazing or double-pane glazing, is a type of window that consists of two glass panes separated by a space filled with air or an insulating gas.
This space acts as an insulating barrier, reducing the amount of heat that can escape through the window.

Single glazing, on the other hand, is a traditional type of window that consists of a single glass pane. This type of window provides limited insulation and does not provide the same level of energy efficiency as double glazing.

Here’s a comprehensive comparison of the two:

Energy Efficiency

Single glazed windows are typically made of a single pane of glass and offer very little insulation, meaning they can be a source of heat loss in winter and heat gain in summer. In contrast, double glazed windows are made of two panes of glass separated by an insulating layer of air or gas, which provides a much higher level of insulation. This improved insulation helps to keep your home warm in winter and cool in summer, which can result in significant energy savings on your heating and cooling bills.

Double glazed windows also tend to have a lower U-value, which is a measure of how well a window resists heat flow. The lower the U-value, the more energy-efficient the window is. Double glazing can typically achieve U-values as low as 1.1, compared to single glazed windows which can have U-values as high as 5.8. This means that double glazing is much more effective at keeping your home at a comfortable temperature, reducing your need for heating and cooling, and helping you to save money on your energy bills.

Overall, double glazed windows are a much more energy-efficient option than single glazed windows, helping to keep your home comfortable, reduce energy usage and lower your energy bills.

Noise Reduction

Double glazing is much better at reducing noise compared to single glazing.
Single glazed windows, which are made of a single layer of glass, are not as effective at reducing noise as double glazed windows. This is because sound waves can easily pass through a single layer of glass and into a building. Double glazed windows, on the other hand, are made of two panes of glass separated by a gap filled with air or an inert gas like argon. The gap between the two panes of glass provides an extra barrier that helps to reduce the amount of noise that enters a building.

Double glazed windows can reduce noise by as much as 80% compared to single glazed windows. This makes them an ideal choice for homes or buildings located near busy roads, airports, or other sources of noise. The effectiveness of double glazed windows at reducing noise can also be enhanced by using low-E glass, which has a coating that helps to reflect noise back towards its source. Additionally, the use of specialized soundproofing seals around the edge of the window can help to further reduce the amount of noise that enters a building.


Double glazed windows tend to cost more upfront than single glazed windows, but they offer a number of benefits that can offset the initial investment over time. The main factors that affect the cost of double glazed windows include the type of frame, the size of the window, the type of glass used, and any additional features such as low-e coatings, argon gas fill, or energy-efficient spacers.

Single glazed windows are typically less expensive than double glazed windows because they are simpler in design and construction. However, over time, the energy savings and other benefits of double glazed windows can add up, making them a more cost-effective choice in the long run.

Ultimately, the cost difference between single and double glazed windows is a trade-off between upfront cost and long-term savings. When considering the cost of double glazed windows, it’s important to factor in the potential energy savings, improved comfort, and reduced maintenance costs to determine the overall value of the investment.


Double glazed windows are typically stronger and more durable than single glazed windows, providing added protection against damage from impacts, such as from high winds, hail, and debris. Additionally, double glazed windows often have stronger seals and frames, which also contribute to their increased durability.
On the other hand, single glazed windows, which only have one pane of glass – are more susceptible to damage from impacts.

Double glazed windows are also better equipped to deal with temperature changes and fluctuations, which can put a strain on the seals and frames of single glazed windows. Over time, this can cause the seals to fail and let in moisture, which can cause problems such as mold growth and structural damage. In contrast, double glazed windows are more resilient and able to withstand these changes without experiencing as much stress or degradation.

In terms of overall lifespan, double glazed windows generally last longer than single glazed windows. With proper maintenance and upkeep, double glazed windows can last for decades, while single glazed windows may need to be replaced after only a few years. Of course, the actual lifespan of a window will depend on a variety of factors, such as the quality of the materials used and the conditions the window is exposed to.


Double glazed windows require much less maintenance compared to single glazed windows. The main reason for this is that the two panes of glass in double glazed windows provide extra protection from the elements and reduce the amount of dust and debris that can build up on the surface of the windows. Additionally, the airtight seal around the edges of double glazed windows helps to prevent air and moisture from getting in, which can cause condensation, mold, and other issues. This not only means less cleaning is required but also helps to extend the lifespan of the windows and reduce the need for repairs or replacements.

By contrast, single glazed windows are more susceptible to weather-related damage, such as warping, cracking, or fogging, and they also provide less insulation, meaning that they may need to be cleaned more frequently to maintain optimal visibility. Single glazed windows also offer limited protection against noise, so they may require additional soundproofing measures to be installed in order to make them more suitable for use in high-traffic areas.


Single glazed windows are more limited in terms of design options.
Double glazed windows, on the other hand, are often more modern and sleek in appearance. They also come in a variety of frame materials and colors, so it’s possible to find a style that matches your home’s decor.

In conclusion, whilst the upfront cost of double glazing is higher (making it an investment that may not be feasible for all homeowners), double glazing is a better option than single glazing in terms of energy efficiency, noise reduction, durability, and maintenance.