Double-glazed windows

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%. 

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.

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.

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.

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.