How much do triple glazed windows cost?

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Are you thinking about upgrading your windows to triple glazed? The average cost of triple glazed windows in the UK ranges from £400 to £600 per window. Our price guide is designed to walk you through everything you need to know about the costs involved in making such an upgrade. Triple glazing, known for its superior insulation properties, can enhance the comfort of your home and contribute to significant energy savings in the long run. However, the initial investment can be considerable, and many factors contribute to the overall cost.

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From the benefits of triple glazed windows to the factors that affect their price, we'll break down the costs and help you budget for your project. Whether you're looking to improve thermal efficiency, reduce noise pollution, or simply increase your property's value, understanding the costs of triple glazed windows is the first step towards making an informed decision.

We'll cover the following topics in this pricing guide:
  1. Average costs of triple-glazed windows
  2. How long does triple glazed window installation take?
  3. How to reduce the costs of triple glazed windows?
  4. FAQ
  5. Your triple glazed window checklist |
triple glazed windows

Average costs of triple-glazed windows

If you are considering an upgrade to triple glazed windows, you're looking at a variety of factors that influence the average cost. Depending on the size of the windows, the frame material, and the specific requirements of your property, the price of your project can differ.

Typically, the average cost of triple glazed windows in the UK ranges from £400 to £600 per window. This price includes both the cost of the window itself and the installation fees.

Table Summary of Costs:

ItemCost Range
Cost per triple glazed window (including installation)£400 to £600
Additional costs for custom sizes or shapesVaries
Cost for upgrading from double to triple glazing (per window)Additional £100 to £200

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How long does triple glazed window installation take?

Understanding the timeframe for installing triple glazed windows is key to planning your home improvement project efficiently. Here's what you can generally expect:


Before the actual installation begins, there might be a period for the manufacturing and delivery of your custom windows. This can take anywhere from 4 to 8 weeks after you've placed your order.

Installation day

For a typical home, replacing old windows with triple glazed ones can be relatively quick, with professional installers able to fit approximately 3 to 5 windows per day. However, the following factors can extend this timeline:

  • Complex installations: If your window openings need adjusting or if you're switching from a different type of window (e.g., from single to triple glazed), the process could take longer.
  • Access issues: Hard-to-reach areas might require additional time or scaffolding.
  • Weather conditions: Poor weather can delay outdoor work, especially if it poses safety risks or affects the installation quality.

Project completion

If your house requires a complete set of new triple glazed windows (let's say around 10 to 15 windows), the entire process from start to finish could take between 6 and 12 weeks.

Tips for a smoother process

  • Clear communication: Keep in regular contact with your supplier and installers to stay updated on your window's manufacturing and delivery schedule.
  • Prepare your home: Ensure easy access to window sites by removing curtains, blinds, and any obstructions inside or outside your home.

How to reduce the costs of triple glazed windows?

You can reduce the costs associated with triple glazed windows by following our tips. Here's how you can manage your budget effectively while still enjoying the benefits of enhanced insulation and energy efficiency.

  • Compare quotes: Don't settle for the first quote you receive. Gather multiple quotes from different suppliers and installers to ensure you're getting the best value for your money.
  • Choose standard sizes: Custom sizes and shapes are significantly more expensive. If possible, opt for standard sizes which are more cost-effective and readily available.
  • Material choice: The frame material can drastically affect the price. While timber and aluminium offer aesthetic appeal, uPVC frames are much more affordable and still provide good insulation.
  • Consider partial upgrades: If replacing all windows at once is beyond your budget, consider upgrading to triple glazing in phases, starting with north-facing or colder rooms to maximise energy savings.
  • DIY some of the work: While the installation of triple glazed windows is best left to professionals, you can save on labour costs by handling some preparatory or finishing work yourself, such as painting around the window after installation.
  • Energy grants and schemes: Look into local or national energy-saving grants and schemes. Some governments offer subsidies or incentives for homeowners upgrading to more energy-efficient windows.
  • Long-term savings: Remember, the initial outlay for triple glazed windows can be offset by the reduction in energy bills over time. The superior insulation means you'll spend less on heating, making triple glazed windows a cost-effective investment in the long run.


When considering triple glazed windows for your home, you're bound to have questions. Here are some of the most common questions homeowners ask, along with their answers:

Are triple glazed windows worth the extra cost?

Yes, triple glazed windows can be a worthwhile investment, especially in colder climates. They offer superior insulation, resulting in significant energy savings over time. Additionally, they can improve sound insulation and increase the value of your property.

Can I install triple glazed windows in an older property?

Absolutely. Triple glazed windows can be installed in both new builds and older properties. However, it's essential to ensure that your property's structure can support the additional weight, as triple glazed units are heavier than double glazed ones. A professional installer can assess this for you.

How do triple glazed windows differ from double glazed windows?

Triple glazed windows have three layers of glass, compared to two in double glazed windows. The extra layer of glass, along with additional gas fillings between layers, significantly improves the window's insulation properties.

Will triple glazed windows eliminate condensation?

While triple glazed windows significantly reduce condensation by maintaining a warmer interior glass surface, they may not eliminate it entirely. Proper ventilation is also crucial in managing condensation levels in your home.

How long do triple glazed windows last?

Triple glazed windows are designed to last for decades. High-quality units can last up to 35 years or more with proper maintenance, making them a long-term investment for your home.

Can triple glazed windows be repaired?

Yes, in many cases, triple glazed windows can be repaired, especially if the issue is related to the frame or seals. However, if the glass unit itself fails (e.g., due to seal failure leading to condensation between panes), it may need to be replaced.

Your triple glazed window checklist

A triple glazed window installation project requires careful planning and preparation. And with our checklist, you’ll enjoy a smooth process and successful outcome:

  • Determine your needs: Assess which areas of your home would benefit most from triple glazing. Consider prioritising rooms that are particularly cold or prone to noise.
  • Set a budget: Triple glazing is an investment. Decide on a budget that includes not just the cost of the windows and installation, but also any potential repairs or modifications to your home's structure.
  • Research suppliers: Look for reputable window suppliers with positive reviews and a track record of providing high-quality triple glazed windows.
  • Get multiple quotes: Don't settle for the first quote you receive. Comparing quotes from several installers can help you find the best deal and understand the market rate.
  • Check for certifications: Ensure your chosen windows and installer meet UK standards for energy efficiency and installation quality, such as the BFRC rating for windows and FENSA or CERTASS certification for installers.
  • Consider the design: Triple glazed windows come in various styles and frame materials. Choose one that complements your home's aesthetic while meeting your insulation and durability needs.
  • Plan for the installation: Discuss the installation process with your chosen installer. Understand the timeline, prepare for any disruptions, and make arrangements to ensure a smooth installation day.
  • Understand the warranty: Be clear on what's covered by the warranty and for how long, including the glass, frame, and installation.
  • Maintenance and care: Learn about the necessary maintenance for your new windows to ensure they remain effective and last as long as possible.
  • Post-installation checks: Once installed, inspect the windows to ensure they meet your expectations and the agreed-upon specifications. Address any issues immediately with the installer.

    Planning to install triple glazed windows? A professional window fitter can be immensely helpful in taking care of these matters for you. Find an experienced builder in your area on MyBuilder.