Cost of Double-Glazed Windows

When it comes to enhancing your home’s energy efficiency, security, and aesthetics, investing in double glazing is a decision you won’t regret. But before you proceed, it’s vital to understand the various factors that influence double glazing costs in the UK.

Getting to know the double glazing cost for the average home can go a long way toward helping you get the best deal for double-glazed windows and become more energy efficient.

We’ll delve into everything you need to know about double glazing costs in the UK, helping you make an informed decision for your home improvement project.

Double Glazing: What Is It and Why Is It Important?

Double glazing involves installing windows and doors that are made with two layers of glass, separated by a space filled with either air or gas.

This design offers several benefits, including improved insulation, noise reduction, enhanced security, and increased property value.

With rising energy costs and growing concerns about climate change, double glazing has become increasingly popular among homeowners in the UK.

Factors Influencing Double Glazing Costs

There are multiple factors that affect the overall cost of double glazing, as the range in price tends to average around £4,200 to £7,300 for a 3-bedroom house. This big difference is influenced by a number of things, which we will discuss here.


The material used for frames and glass significantly impacts the overall cost of double glazing. Common frame materials include uPVC, aluminium, and timber, each with its own price range and benefits.

uPVC is usually the cheapest of the materials but may also not be as ideal as a long-term option compared to stronger materials such as aluminium. Although uPVC windows are a great budget option, you may want to consider more durable materials in the long run.

Aluminium windows seem to be getting more and more popular as time goes on, which isn’t a shock given their durability and efficiency. They are slightly more expensive than uPVC windows, but are a brilliant long-term choice that can actually save you money over the years due to their thermal efficiency and reliability.

Finally, there is timber, which is the most expensive among the 3 materials. Despite timber bringing a retro and elegant aesthetic to homes, its high cost is not a good option in the long run. Timber tends to get scratched and damaged easily, and it is more prone to warping and cracking, which could mean constant window repairs and replacements.

Size and Quantity

The size and number of windows and doors you need to double-glaze will obviously affect the total cost. Larger or custom-sized windows may cost more to double-glaze compared to standard sizes due to the materials and labour required to manufacture and fit them.

Glass Type

The type of glass used can vary in terms of thickness, energy efficiency, and additional features such as self-cleaning or tinting. These factors will influence the overall cost of double glazing.

Installation Complexity

If your property requires extensive preparatory work or if access to windows and doors is challenging, the installation costs may be higher.

Additional Features

Extras such as decorative glazing, specialised locks, or integrated blinds can add to the overall cost but may enhance the functionality and aesthetics of your double glazing.

Average Double Glazing Costs in the UK

It’s important to note that double glazing costs can vary depending on the factors mentioned above and your location within the UK.

However, to provide you with a general idea, here are the average costs based on typical window sizes:

Small Window (60cm x 90cm): £250 – £550

Medium Window (120cm x 120cm): £400 – £850

Large Window (120cm x 180cm): £850- £2,100

These are rough estimates, and actual costs may vary based on your specific requirements and preferences.

Saving Money on Double Glazing

While double glazing is undoubtedly an investment in your home’s comfort and value, there are ways to save money without compromising on quality.

Here are some ways that you can save money on getting double-glazed windows in your home.

Compare Quotes

Obtain quotes from multiple reputable suppliers and installers to ensure you’re getting the best deal. Free online quotes for double-glazing and double-glazed windows should be easy to get and will help give you a better idea of what price you should be paying for double-glazing.

Energy Efficiency

Opt for high-quality, energy-efficient glass and frames to reduce heating bills and qualify for potential government incentives.

This will also help you save money over the years that you have your double-glazed windows, which can mean that you paying a higher initial cost for your windows is actually more cost-effective and is saving you money on energy bills.


Regular maintenance and upkeep can prolong the lifespan of your double glazing, saving you money in the long run.

Installing Double-Glazed Windows

Investing in double glazing for your home is a decision that offers numerous benefits, from improved energy efficiency to enhanced security and aesthetics.

By understanding the various factors that influence double glazing costs in the UK and exploring ways to save money, you can make a well-informed decision that suits your budget and requirements.

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