Triple Glazed Sash Windows in London

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What Are Triple Glazed Sash Windows?


Triple-glazed sash windows are superior windows that incorporate three layers of glass. As they are made of triple-glazed sashes with three panes of glass, they have inert gas in-between the two outer layers of glass. This means you can see through them as normal but they maintain heat extremely well. Manufactured to extraordinarily high standards, triple glazed sash windows improve insulation and make homes warmer. They are also soundproof, beautiful looking and well packed. Triple glazed windows provide an affordable solution to the problems of heat loss, noise pollution and ill health that come with sub-standard windows.

Why Choose Triple Glazed Sash Windows?


A++ energy rating (highest energy rating for windows)

These windows are much more energy-efficient than single-pane sash windows with up to a 75% reduction in heat loss.

Improved thermal insulation

Triple glazing offers excellent thermal insulation properties. It improves the thermal performance of your windows and doors and is especially cost-effective when used in living spaces such as bedrooms, bathrooms, kitchens and conservatories.

Better resistance

Triple glazing offers more resistance to noise pollution and unwanted draughts and will reduce condensation.

Increased value of your home

With triple glazed sash windows, you can ensure a great return on your investment while increasing the energy efficiency in your home.

Preserve your investment for years to come

Unique triple glazing seals out the weather by keeping heat in and cold out; keeping draughts out and noise and drafts down as well as providing a barrier against moisture.

Key Features of Our Triple Glazed Sash Windows


Thermal breaks

Our triple glazed sash windows are designed to meet today’s energy efficiency standards, including the latest thermal break technology, helping you to save money on rising energy bills.


These sets of windows can really make your home stand out from the crowd, and one glance at the huge range available and it’s clear to see that there really is something for everyone.

Much thicker and compact

This is why triple glazing can help reduce heating bills by up to 20% a year, based on a comparison with a single glazing model.

Soundproofing effect

Triple glazed sash windows offer up to 50% sound reduction. They have an R-Value of 1.1 (U) for energy efficiency and frost protection, plus they are made from 5mm double glazing which means peace of mind for your home’s security.

Our Guarantee

  • Unrivalled Expertise in Door & Window Glazing
  • Industry-approved Door & Window Glazing
  • High-quality Door & Window Glazing
  • Unbeatable Value for Money
  • 100% Safety and Satisfaction
  • Checkatrade Registered
  • Homepro Insured
  • CERTAS Guarantee

Our Triple Glazed Sash Windows Provide You With the Highest Level of Security


Windows are one of the main ways burglars get into a house, which makes security vitally important. Our triple glazing is the latest security enhancement that provides a tough barrier against intruders. Don’t leave yourself vulnerable to crime any longer. Contact our specialists now on 020 452 51669 or fill our online form to arrange a quote on installing triple glazed sash windows at your property.

Our Triple Glazed Sash Windows Material Options



uPVC is the most affordable and cost-effective window material. uPVC sash windows offer the perfect solution for any property. Not only do they provide an excellent source of natural light and ventilation, but their triple glazing offers that extra insulation.


Sash windows bring beauty and character to both modern and traditional properties. When you choose timber sash windows, you are choosing an environmentally friendly solution to meet a legal requirement on listed buildings; a window that fits with traditional or modern architecture.


Aluminium sash windows are robust and durable, highly resistant to rust and corrosion. Your new aluminum sash windows will not warp, rot, or break, making the sashes secure from the elements all year round. They add elegance to your home and are extremely easy to clean, due to their slim-line design.

Choose From a Variety of Colours

Our triple glazed sash windows offer exceptional value for money and are available in a range of colours.

  • White
  • Anthracite Grey
  • Cream
  • Black Brown
  • Golden Oak
  • Rosewood
  • Chartwell Green
  • Agate Grey
  • Irish Oak
  • English Oak
  • Nut tree
  • Anthracite smooth grey

Our Range of Finishes to Complement the Style of Your Home


At Trade Timber Windows and Doors Sash Windows London, we pride ourselves on providing an extensive range of sash window options to complement the style of your home and meet your taste and budget requirements. Our timber, aluminium, and uPVC triple glazed sash window ranges provide a wide range of finishes, from modern white gloss to timeless traditional cream, so you can choose the one that blends into your room’s decor seamlessly. Regardless of your home’s decor, we can work with you to find the perfect finish. Contact us today for more information.


Let Us Start a Project Together

If you need Box Sash Windows, go with Trade Timber Windows and Doors Sash Windows London. We are approved by Checkatrade and CERTAS, which means we have undergone a rigorous inspection process to ensure that we meet the high standards required. Trade Timber Windows and Doors London is one of the UK’s leading providers of box sash windows, with a wide range of styles available. Contact us for your FREE brochure today or call 020 452 51669 for a free, no-obligation quote.




Frequently Asked Questions

How much does triple-glazing cost in the UK?

Triple glazing is an investment and as such, it is important to find out the cost of triple glazing before you make a purchase. The cost of triple glazing varies depending on the type of windows that you want to install. For instance, if you are looking to install high-quality sash windows, then the cost would be higher than if you want to install modern aluminium-framed double glazed units. Triple glazing prices start from as little as £ 120 and can vary per the size of the window.

Why should I opt for triple-glazed windows?

Simply, triple glazing helps reduce noise and outside heat loss by around 50% for a typical 3-pane window, compared to double glazing, without the need for external insulation. It protects from burglary and avoids cold spots that can be created from draughts.  And because it is specifically designed for sash windows, you won’t lose any of the original character of your home that you might if you use standard double-glazed units.

Are double-glazed sash windows the same as triple-glazed sash windows?

The two words are used interchangeably today although double-glazed is sometimes used to describe windows which have only two panes of glass. A double-glazed window has two panes, a sash and a frame, whereas triple-glazing has three panes, a sash and a frame. However, when triple glazing was first introduced into the building industry, single and subsequent additions of extra layers of glass were named as triple-glazing. The name ‘triple-glazed’ therefore refers more to the number of panes in the window rather than the service it provides as this may range from one pane (single) to six or even eight panes in commercial buildings. Usually, triple glazing is made up of three layers of glass, with an additional layer of air contained between each pane.

Is triple-glazing more expensive than double-glazing?

Triple glazing is significantly more expensive than double glazing, but there are savings in other areas that can justify the cost. On the other hand, triple glazing may not be worth the expense for all your windows if it means paying much more than you’re comfortable with. But triple glazing is a very cost effective way of saving money on your energy bills. The energy savings could pay for the installation costs within 5 to 7 years, with an estimated drop in energy consumption of 30%.

Are double/triple glazed sash windows more expensive than `single glazed`?

This all depends on the actual specification of the product. `Triple glazing` is actually a widely recognised method to make glass extremely energy efficient. It could pay for itself over the long term or even in your first year if you employ home improvements from qualified professionals. If you hire our services to carry out your triple-glazed sash windows installation, we can provide you with detailed quotations and provide you with a breakdown of prices on request before any work commences.

How can you tell if a window is triple-glazed?

It’s simple. Triple glazed windows are usually identified by a letter ‘G’ followed by two figures. The first of those figures tells you the thickness of the glass in millimetres, and the second is the number of panes of glass in the window. Triple-glazing is the most effective way of reducing noise and retaining heat and is typically used in domestic sash and casement windows. All of its panes are double the thickness of regular windows, and they’ve got an Argon-gas filling in between the glass panes.

Do triple glazed windows save on my heating bills?

With a triple-glazed sash window, you can expect a U-value of 2.1W/m2k. This is very good as it can save you a lot.


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