Why Choose Sliding Sash Triple Glazed Windows?

Sash windows have been popular for centuries, and were one of the most important features of properties during the 18th and 19th centuries. The popularity declined somewhat during the middle of the 20th century, but fortunately they are starting to make a comeback in both period and modern properties.

A growing appreciation of Victorian craftsmanship, a demand for bespoke and alternative window designs and their sheer class and elegance has put sash windows back on the map. In addition to looking stunning on any property, sash windows are also the perfect candidate when it comes to triple glazing.

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Sash Windows In A Nutshell


Here are just some of the advantages of choosing sash windows for your property:

  • Good choice of materials available
    choose from PVCu and timber designs

  • raditional design
    retain the splendor and beauty of Edwardian, Georgian or Victorian properties, or add a traditional twist to contemporary properties

  • Authenticity
    great for adding authentic charm and a unique aesthetic, especially when choosing the timber option

  • Low maintenance options available
    modern PVCu sash windows are a low maintenance option

  • Available in a range of timbers
    choose from a range of responsibly sourced timbers in softwood and hardwood designs

  • Georgian bars
    add the Georgian bars option for a more authentic look

  • Stylish and practical
    sash windows offer a beautiful look, but also ensure your home is warmer, more secure and quieter

Are Sash Windows The Right Choice For My Home? - A Cost Comparison

Whether you are replacing existing sash windows, or installing sash windows for the first time, it’s important to weigh up the pros and cons. One of the most important considerations, and before looking at the benefits of triple glazed sash windows, is the capital cost. Once you have an idea of how much new windows will cost, you can start to assess the benefits to ensure you are making a wise investment. There are a number of options you can choose if you are considering sash windows, and the costs fluctuates considerably with each. However, cost is not the only consideration, and you should also take into account long-term energy savings, heat retention, noise prevention, aesthetics and maintenance.

The cost comparison below is based on real quotes, and also gives an idea of approximate U-values associated with each option.

Glazing/Window Option U-Value W/m2k (approx) Cost estimate for 11 windows based on 2014 prices
New high performance timber triple glazed sash windows with draught stripping 0.9 £15,000
New box sash timber windows double glazed plus draught stripping 1.7 £12,000
Secondary glazing – fitted internally 1.5 £6,000
Reglaze existing sash windows and add draught stripping 2.1 £5,000

As you can see from the table above, there is a vast drop in U-value between double glazed and high performance triple glazed sash windows, but only a relatively small increase in price. This makes triple glazed sash windows a very wise choice if you are looking to improve energy efficiency, keep warmth in and draughts out, reduce your energy bills and improve the look and value of your property.

It’s important to remember that approximately 10% of heat losses from a home are attributed to heat loss through glazing. By upgrading your windows to high performance, energy efficient glazing, you can reduce this heat loss and associated higher energy costs.

Installing Triple Glazed Sash Windows - What To Expect

Refurbishing any house requires decisions to be made about a number of elements of the building construction and fabric, not least performance, cost and aesthetics - especially in listed buildings or properties in conservation areas. However, there are no hard and fast rules and each building needs to be assessed individually on its own merit.

Below we have included some of the benefits of installing triple glazed sash windows, and what to expect from a fitting perspective if you choose this option.

Triple glazed sash windows offer excellent thermal performance

Sash windows with triple glazing offer very good air tightness

Triple glazing offers better noise reduction than double glazing

If you are aiming to achieve 80% carbon reduction or more, or for the Passivhaus standard, triple glazing is essential

If you are replacing box sash windows, building work may be required to fill in wall pockets on either side of the window jamb

Triple glazing will change the appearance of your home as the frames are thicker. If you live in a listed property or conservation area, you will need to consult a specialist window company with experience in these areas.

Timber Sash Or PVCu Sash? Which To Choose?

For many people replacing their windows, PVCu is usually the first choice because it is cheaper than timber. When it comes to sash windows, more and more PVCu window suppliers are creating PVCu triple glazed sash windows that look as good as original period designs, and which operate beautifully for many years. If you are looking for a cheaper option than wood that is also low maintenance and gives you all the benefits of triple glazing, PVCu is probably the best choice for you.

That said, for the traditionalist looking for a more natural sash window, and who would like a choice of different woods, styles and decoration options, timber tripled glazed sash windows could be the perfect choice. Timber frames also last a lifetime, and much longer than PVCu windows. Anglian, for example, offer a 10 year guarantee with their PVCu window frames, whereas timber frame windows last for decades if they are maintained correctly.

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Choosing A Good Sash Window Fitter


Once you have made the decision that triple glazed sash windows are for you, it’s time to locate a fitter. Look for a fitter that either specialises in fitting sash windows, or who has fitted sash windows extensively. They will have experience where it counts and give you professional advice and service that will ensure your windows give you the best performance and return on your investment. Also, always choose a company that is registered with FENSA (Fenestration Self-Assessment Scheme), an organisation that was set up to help regulate and support building regulations concerning glazing requirements in England and Wales.

Published on : 14th November 2016

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