All you need to know about triple glazing in 2025

Triple glazing is growing in popularity in homes and commercial buildings across the UK.

An essential element of achieving energy efficient, airtight buildings and lowering heating costs, triple glazed windows are growing in popularity, offering many benefits for homeowners. 

What are triple-glazed windows?

Triple-glazed windows have units with three panes of glass. The space between panes is filled with an inert gas – usually argon or krypton – which is a better insulator than air.

The insulation, noise reduction and security properties of these windows are significantly better than any single or even double-glazed equivalents.

Triple-glazed windows are growing in popularity and projected to be one of our top window trends for 2025. 

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What are the benefits of triple-glazed windows?

  • Two women sitting on a couch by a large triple-glazed window, looking out at a scenic view.

    Comfort:

    Triple glazing reduces draughts and cold spots.

  • Modern dining area with large triple-glazed windows overlooking a scenic landscape

    Security:

    PAS24 products and laminated glass provide extra breakage resistance. 

  • Modern kitchen with white island, wooden cabinets, and large triple-glazed window

    Lower heating bills:

    Using superior triple glazing with low U-values reduces energy consumption. 

  • Modern house exterior with large triple-glazed windows and a cloudy sky

    UV control:

    This Cheltenham home uses solar control glass for year-round comfort. 

  • Superior thermal insulation

    In most houses, 20-25% of heat is lost through windows and doors.

    Using superior triple glazing with low U-values, homeowners benefit from lower energy bills and a noticeably more comfortable living experience, with no draughts, cold spots or condensation.

    Many of Norrsken's triple-glazed windows have a U-value of less than 0.8 W/(m²K) – 50% better than the best double-glazed windows.

  • Enhanced noise reduction

    Triple glazing reduces noise by physically blocking sounds.

    Most customers report noticeably quieter homes with triple glazing installed. In our laminated glass units, a thin layer of polyvinyl butyral resin (PVB) bonds glass sheets together.

    Originally used for safety and security, laminated glass also provides excellent acoustic performance by dampening sound waves.

  • Increased security

    All Norrsken’s triple-glazed windows and doors conform to PAS 24:2016 enhanced security performance requirements.

    Key-operated, multi-point espagnolettes and multiple locking points to both windows and doors provide extra security and resistance to forced access.

    For enhanced safety and security, we offer laminated glass as an optional upgrade for all Norrsken products used in new build projects.

    Enhanced security measures in windows and doors are one of our top trends to watch in 2025. 

  • Potential condensation reduction

    Condensation occurs when warm, moist air comes into contact with a colder surface.

    Triple glazing creates a bigger barrier between warm air inside and chilly air outside. This keeps the inside window surface warmer, reducing the chance of condensation.

    The extra air/gas gap acts like another insulator, slowing heat transfer and keeping the inside glass from getting too cold – another key factor in condensation.

  • Reduced UV rays

    Triple glazing offers increased protection against UV rays by the presence of three factors:
    More barriers:

    Each glass pane blocks some UV, and with three panes, there are more opportunities for UV rays to be blocked before reaching the interior of your home.

    Selective coatings:

    Some triple-glazed windows incorporate special coatings on one or more panes specifically designed to reflect or absorb UV radiation for even greater protection.

    Gas fillings:

    The inert gas between panes can also absorb some UV radiation.

    The combined effect of these factors is a significant reduction in UV penetration compared to single or even double glazing, slowing furniture and interior fading, reducing skin cancer risk and enhancing eye protection. 

Did you know?

The award-winning triple-glazed P31 Window from Norrsken performs virtually identically in both all-timber and alu-clad timber options. 

The result is an incredibly adaptable window that is just as suitable, in its all-timber version, for traditional cottage renovations as it is as an alu-clad window in modern new build projects.

What should you consider when choosing windows and doors? 

Modern garden building with triple-glazed glass doors, stone walls, and outdoor furniture.

Cost

Bespoke triple-glazed windows typically cost more than double-glazed windows.

Prices depend on the model selected, size and shape, and requirements for additional services such as installation.

However, the increase in thermal performance from Norrsken's double to triple-glazed range is about 40-45% - while the uplift in cost is usually only 10-15%. 

Further, while triple glazing usually has a higher upfront cost than double glazing, the long term savings it provides are often a tipping point in the decision-making process for window buyers. Savings come from:

  • Energy Efficiency: Triple glazing's superior insulation can significantly reduce your energy bills for heating and cooling. Over time, these savings can offset the initial higher cost. If windows are a major source of heat loss or gain in your home, triple glazing can offer a greater return on investment.

  • Reduced Maintenance: Triple-glazed windows are generally more durable and require less maintenance compared to single or double glazing, potentially saving you money on repairs or replacements down the line.

  • Increased Value: Triple glazing can enhance the value of your property due to its energy efficiency and improved comfort features.
Modern house exterior with triple-glazed glass door and metal facade, surrounded by greenery.

Weight

The extra glass pane in triple glazing creates a heavier overall unit than a double-glazed product of the same dimensions.

The extra weight may require a more robust window frame to ensure proper support. When choosing your windows, consider: 

  • Window Size: Weight increases with the unit size, so larger triple-glazed windows and doors require more planning to manage and install.

  • Building Structure: Ensure your home's structure can handle the additional weight of triple glazing.

  • Installation: Factor in potential difficulties during installation due to weight. Norrsken provides a full supply & installation service to give you complete peace of mind for your new windows and doors.

  • Opening Mechanisms: Choose appropriate opening mechanisms that can handle the heavier windows. Explore the options available to you in our durable window range here.

While triple glazing offers excellent benefits, its weight is a key consideration during the decision-making process. Carefully evaluate your specific situation regarding window size, building structure, and installation feasibility to ensure successful implementation.

Modern room with large triple-glazed glass doors leading to a patio area with furniture.

Aesthetics: alu-clad timber or all-timber?

Both double and triple-glazed windows are available in all-timber or alu-clad timber options.

If you prioritize historical accuracy or a warmer aesthetic, alu-clad timber or all-timber windows with clear lacquer or wood stain internally will showcase the beauty of timber in your project.

If sleek lines and low maintenance are your focus, then aluminium-clad timber in a modern, square-edged profile are for you. 

Which windows are right for you?

Take our short survey to discover the perfect windows for your project.

  • How are triple-glazed windows and doors installed?

    Most Norrsken customers opt for a supply & installation contract to ensure that each installation is managed with great efficiency and our clients obtain the most energy-efficient installation to complement their windows and doors.

    Maintenance requirements are very similar for triple and double-glazed windows and doors, and opting for alu-clad timber means near-zero maintenance. 

  • Do triple-glazed windows meet the new UK Building Regulations?

    Triple glazed windows may help you to meet parts of the UK Building Regulations with greater ease.

    Part F, Part O and Part L require windows and doors to meet certain requirements to ensure UK homes are well-ventilated, energy efficient and do not overheat. With Norrsken triple glazing, you can meet the new regulations with ease and be supported by our knowledgeable team of experts. 

  • Are triple-glazed windows good for the environment? 

    Norrsken customers achieve high energy efficiency in the home without compromising on style or quality.

    Using our innovative triple-glazed windows and doors as part of your new build or refurbishment project can contribute to a significant reduction in your home's CO2 emissions and a useful reduction in your heating bills.

    Buildings account for approximately 39% of global carbon emissions - so building to an energy-efficient specification, like Passive House, monitoring and limiting energy usage and installing triple-glazed windows with low U-values will all contribute to reducing carbon emissions from the built environment.

  • Are triple-glazed windows right for you?

    Triple glazing provides homeowners a marked increase – 40-45% - in thermal performance from double-glazed alternatives, meaning greater comfort, lower heating bills, and an uplift in property value.

    These triple-glazed windows and doors are durable, secure and aesthetically pleasing - and they're not just for Passive Houses, either. 

    When choosing your windows and doors, though, you should take into account your whole-building thermal efficiency, budget, and noise concerns to make an informed decision. High performance double glazing can provide a useful alternatives to those considering triple glazing who feel it doesn’t suit their project requirements. 

Choosing Norrsken isn't just about windows and doors; it's about choosing a partner in your building journey 

At Norrsken, we supply and install the UK's finest double and triple-glazed timber alu-clad windows and doors. We take pride in exceptional craftsmanship, meticulous attention to detail, and outstanding customer service.

From initial consultation to after-sales support, we're here to ensure your complete satisfaction. So ditch the window search blues and embrace a smoother, more streamlined building experience with Norrsken by your side. Explore our stunning range of alu-clad timber windows and doors today, and discover the Norrsken difference.

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Unmistakably trusted.

The highest compliment is a recommendation. These are the voices of those who placed their trust in us.

"Excellent Company from start to finish… If only every window supplier operated like this! I have used many others over the years on various projects but Norrsken far exceeded all of them… I hope this helps you make a decision for what is probably a large chunk of your budget… They are totally worth it"

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Angela Smith

Self Builder

“Having used Norrsken in the past we were happy to recommend them to one of our clients who was looking for the best sound proofing and weatherproofing they could get being set on a hill top overlooking the sea and facing strong westerly winds. They were not disappointed. A quality product, delivered well and on time. Thankyou.”

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Ken Pearson

Homeowner

"Fantastic professional service, from the original design to the final installation. The triple-glazed windows and doors that have been fitted to our new house are of a very high quality and look amazing. We definitely made the right choice when we decided to use Norrsken, nothing is too much trouble for them."

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Nigel

Homeowner

"I did my research before contacting Norrsken but they had come highly recommended by our Architect for our Passive House self build.

From the first meeting with Nick we felt confident that they were the Company for us."

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Ali and Brian Manning

Passive House Self Builders

“The quality of the triple glazed, alu-clad windows and doors is superb. They feel so reassuringly solid ... I opted for a wood stain for the internal finish on the frames, and am so glad I did, as it shows off the beauty of the wood perfectly. The whole process from order to installation went smoothly. I thoroughly recommend Norrsken.”

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Gareth

Homeowner

"Norrsken provided attentive service from drawings to on-site installation for our project at National Trust Stourhead and we would definitely recommend and repeat commission them on future projects."

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Charlotte Hill-Baldwin

Architect, H-B Designs

“From our very first interaction to the aftercare support, Norrsken has been exceptional. The quality of their windows is outstanding - beautifully designed, expertly crafted, and a real standout feature in our home. They've truly elevated the overall look and feel of the house.”

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Neil Southwell

Self Builder Homeowner

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