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Double-glazed windows

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Your guide to double-glazed windows

If you're contemplating an upgrade to your home or simply intrigued about the benefits that double glazing can offer, you've landed in the right place. We aim to equip you with all the information you need, helping you navigate the world of double-glazing with ease and confidence. 

Whether it's enhancing your home's energy efficiency or reducing noise pollution, understanding the long-term value and upfront costs of double-glazed windows is essential. Join us as we unwrap the ins and outs of double glazing, offering insights into how this investment can completely transform your living space.


Compare double-glazed window quotes

With SpotDif, you can quickly receive the best window quotes available in your area, each matched with a vetted and accredited supplier. Our service meticulously selects suppliers based on their accreditation status and customer satisfaction ratings, ensuring that you only receive offers from the highest-quality providers. This matching process helps guarantee that you not only find competitive prices but also work with suppliers who meet stringent quality and reliability standards, giving you peace of mind throughout your purchase and installation process.

Why consider double glazing for your home?

Double glazing adds an extra layer of security to your property, thanks to its robust construction. Double-glazed windows and doors are tougher and more resistant to break-ins, giving you peace of mind when you need it most. 

Also, they're great at reducing condensation inside your home, which helps in preventing dampness and mould, keeping your living spaces healthier. 

Upgrading to double glazing can also be a smart investment, potentially increasing your property's market value. It's not just about immediate benefits — it's about making a choice that pays off in the long run for your home's comfort and safety.

Is double glazing for windows worth it?


Double glazing for windows is a worthwhile investment for several compelling reasons. Firstly, it significantly enhances thermal efficiency, leading to lower energy bills and a more comfortable living environment. By trapping a layer of air between two panes of glass, double-glazed windows reduce heat loss in winter and prevent excess heat in summer. 

Additionally, they offer improved noise insulation, creating a quieter, more peaceful home. Moreover, double glazing enhances security due to its sturdier construction and can increase property value. 

The long-term savings and comfort benefits make double-glazed windows, including options like uPVC double-glazed windows, a smart choice for homeowners.

Secondary window glazing can also be highly beneficial when it comes to selling your property. For many homeowners, double glazing is a great investment, helping boost property sale prices by up to 10%. 

How much do double-glazed windows cost?

The final cost of installing double-glazed windows is influenced by several factors including the number of windows, the size of your property, and the specific window type (like uPVC double-glazed windows or wooden double-glazed windows). 

Double glazing cost per window

New windows installed

The cost of a single double-glazed window typically ranges between £150 and  £600. This variation largely depends on the material (like uPVC, wooden, or timber), size, and design features. For instance, a standard uPVC double-glazed window is more affordable than its wooden or timber counterparts.

Double glazing cost based on house size

Windows in a modern setting

Wondering how much your double-glazed windows could cost? Perhaps you have a 2 bedroom house, or maybe more. Take a look at our estimated costs below.

  • Two-bedroom house: For a two-bedroom house, equipping double glazing every window can cost approximately £2,000 to £4,500. The total cost includes both the windows and installation fees by professional double-glazing installers.

  • Three-bedroom house: In a three-bedroom house, the price increases due to more windows. Expect costs ranging from £3,000 to £5,500. The variation again depends on the chosen materials (like uPVC or wooden double glazing) and the style of windows (such as sash UPVC or grey UPVC windows).

  • Four-bedroom house: A larger house, such as a four-bedroom home, would typically cost between £4,500 and £7,500 for complete double glazing installation.

  • Terraced houses: Smaller terraced houses with fewer windows can expect lower overall costs, roughly between £2,000 to £3,500 for full-house double glazing.

  • Detached homes: Larger detached homes, potentially with bespoke window needs like wooden double-glazed windows or specific designs like sash windows, can see costs upwards of £5,000 to £8,000.

To get an accurate estimate for double-glazing services near you, use the SpotDif price comparison tool so you can compare double-glazing costs from various reputable installers.


Compare quality double-glazed window installers

SpotDif takes pride in only working with trusted and vetted suppliers across all industries, to ensure we get you the service thats right for you. First we ask you a few questions, then we’ll show you double-glazed window quotes from reliable installation companies that operate in your local area. All that’s left is for you to choose the right one for you.

Factors influencing the cost of double-glazed windows

Windows in a modern setting

While these are only estimated costs for window double glazing, there are a few factors that can impact the overall price of your project.

Cost variation by style and material

uPVC double-glazed windows are universally popular due to their cost-effectiveness and durability. Their cost typically ranges from £150 to £400 per window. Styles like uPVC grey windows are a trendy choice but therefore may have a slightly higher price tag.

Wooden or timber double-glazed windows offer a classic aesthetic so they are typically priced higher between £400 to £800 per window. This cost reflects the quality of the material and the level of craftsmanship involved.

Sash windows with uPVC frames combine traditional style with modern materials and can cost from £500 to £1,000 per window. Double glazing a timber sash window can be even more expensive due to its intricate design and material.

Geographic cost variations

In major cities and urban areas, the cost of double-glazing installation might be higher due to increased labour costs and logistical expenses. For example, if you want double-glazed window installation in London, you may get a higher quote than a customer in a more rural area.

It’s also important to consider that the UK sees a variation in pricing based on region. Installation costs in the South East tend to be higher than in the North or Midlands. 

However, using SpotDif's price comparison tool can help you find competitive rates regardless of your location.

Should I replace my double-glazed windows?

Window being recycled

If your windows are showing signs of wear like condensation between panes, draughts, or inefficient thermal retention, it might be time for an upgrade. 

Modern double-glazed windows, such as uPVC double-glazed or wooden double-glazing, offer superior energy efficiency and noise insulation compared to older models. 

A replacement could also be beneficial if you're seeking a fresh look or better security features. It’s always best to assess the condition and performance of your current windows and consider the long-term benefits of newer, more advanced double-glazing options before making a decision.

How many years do double-glazed windows last?

Double-glazed windows typically last between 20 to 25 years, but this lifespan can vary depending on the quality of materials, installation, and maintenance. High-quality options, when properly maintained, can even exceed this average lifespan, offering long-term value and efficiency.

How can you tell if your double glazing has worn off?

If you want to check whether your double glazing has worn off, look for these key indicators:

  • Increased condensation between the panes.

  • Noticeable draughts around the window area.

  • Reduced thermal efficiency, leading to colder rooms.

  • More external noise seeps into the room.

  • Physical damage like cracks, chips in the glass, or frame deterioration.

The best time to replace double glazing

The best time to replace your double-glazed windows is when you notice any declining performance, such as increased energy bills, draughts, or condensation between panes. It's also ideal to replace them during milder weather conditions, ensuring a smoother installation process and minimal discomfort in your home.

Can you add secondary glazing to existing single-pane windows?

Yes, it’s entirely possible to add glazing to an existing single-pane window! Secondary glazing involves installing an additional pane of glass or clear acrylic inside your existing window frame. 

It's an effective way to enhance insulation, improve soundproofing, and increase security — all without replacing the entire window. This solution is particularly beneficial in conservation areas or listed buildings where changing the external appearance of windows isn't allowed. It's also cost-effective and less disruptive than full window replacement. 

What’s more, secondary glazing can be a permanent fixture, or designed to be opened and removed easily for cleaning and ventilation purposes.

Discover leading windows suppliers

Our comprehensive comparison tools help you identify the best offers in the market, ensuring you receive premium quality at competitive prices. 

Are there any eco-friendly options available for double-glazed windows?

For the eco-conscious amongst you, there are several eco-friendly options available for double-glazed windows that cater to environmental consciousness and energy efficiency.

Eco-friendly window frame materials

To make a more sustainable choice, consider frames made from sustainable materials like timber from certified forests, or recycled uPVC. Timber frames are not only renewable but also provide excellent insulation, reducing energy consumption.

Advanced glass technology

Low-emissivity (low-E) glass coatings significantly minimise the amount of infrared and ultraviolet light that passes through the glass, reducing energy loss without compromising light transmission.

Eco-friendly insulating gas for windows

In the double glazing gap, argon gas, a non-toxic option with lower thermal conductivity than air, enhances window insulation, contributing to better energy efficiency.

High energy ratings

Choosing windows with high energy ratings ensures they are effective in minimising heat loss. This not only reduces energy bills but also lessens the environmental impact over the window's lifespan.

Can you get a grant for double glazing?

Thankfully, grants for window double glazing may be available through government energy efficiency schemes or local council initiatives — all of which are subject to eligibility.

There are many UK grants for double glazing available. Head on over to our Window Grants Page for more information.


Find double-glazed windows with help from SpotDif

Looking for the perfect double-glazed windows? Our team at SpotDif is here to simplify your search.  Our comprehensive price comparison tool helps you effortlessly compare the prices of different double-glazed windows from various suppliers. Benefit from the convenience of finding the best deals, ensuring you get quality windows at the most competitive prices.  We're committed to helping you make an informed decision that suits both your needs and budget. Ready to upgrade your home with the ideal double-glazed windows? Let’s start by guiding you to the perfect choice.
Frequently Asked Questions
Anna Dearden
Home Sector Specialist
Combining in-depth research with an interest in all things home improvement, I aim to keep SpotDif readers up to date with interior design trends, renewable energy options, and more.
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