The Specialist in Traditional Sash Windows is a FENSA Registered Company.

Double Glazing Installation & Repairs for Windows and Doors

Double glazed glass options for draught and sound-proofing your home.

Specialist Double Glazing Services

Double glazing works by using two panes of glass within one sealed unit, this insulated space between the panes of glass is filled with argon gas that creates a highly efficient layer of insulation that reduces heat transfer between the inside and outside. Not only does this help draught and soundproof your home, but it helps prevent condensation, as the internal pane of glass remains closer to room temperature.

Despite being such simple improvements, the real-life benefits of effective draught-proofing windows and double glazing all translate into enormous savings on energy bills – some researchers stating as much as a 25% decrease, just by draught-proofing alone. Find out here how the UK government are supporting households to improve their energy efficiency, save money and protect the planet.

Our double Glazing incorporates 4mm Toughened Low E Glass and a 4mm Soft Coat (energy efficient) Inner Pane and the unit is argon filled, which is not only a subtle transformation but is aesthetically pleasing and in keeping with the traditional style of timber windows and doors.

All the double glazing that is offered by The Specialist in Traditional Sash Windows has a low-level U-Value, which helps to retain the heat in your property. Each window will have a U-Value of 1.5 or less, which achieves current building regulations and all units have been tested and certified to this level.

Even if you live in a period property with original box sash windows still in place, we are experts in upgrading homes to reap all the benefits of modern double glazing while retaining the traditional aesthetic.

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0800 389 73 84

The benefits of double glazing vs single glazing:

Double glazing is…


Sash Windows Glazing Team Pink Icon Designed to keep heat in your home


Sash Windows Fitting Team Pink IconMuch more secure – Harder to break and, if you do break it, will be less likely to break into long and dangerous shards.


Sash Windows Glazing Team Pink IconDouble glazing helps reduce noise


Sash Windows Support Team Pink IconMore compliant with building regulations – Building regulations now state that all new build houses must be fitted with double-glazing, instead of single-glazed windows. These ‘thermal performance standards’ came into effect in April 2002, as part of a move to prevent household energy inefficiencies.


Other glazing options we offer:


Sash Windows Glazing Team Pink Icon Acoustic glass – to help further reduce sound ingress be it voice, road, plane or train


Sash Windows Fitting Team Pink Icon Toughened or laminated safety glass


Sash Windows Glazing Team Pink Icon Sandblasted (Satin) glass – for privacy in bathrooms, etc.


Contact us now to discuss your glazing requirements.

Double Glazing Perfect for Your Home Improvement Project

There is a wide range of improvements that you can make to your home to add value to it, none more important than double-glazed windows. Not only will they improve the appearance of your home, but they will also help you save money on your energy bills. By installing high-quality double-glazing, you are able to keep the heat your home produces within the confines of your house.

Double-glazing isn’t just what makes our windows so energy efficient. As we are committed to a sustainable future, we favour high-quality Grade A redwood or Accoya wood over typical uPVC plastic that some sash windows come furnished with. Not only is the wooden option less prone to warping, but it is also better at keeping unwanted drafts out due to its sturdy nature. To find out more about how we are committed to the environment and whether you’re applicable for any government loans, visit our Energy Efficiency & Government Grants page.

Why Choose The Specialist In Traditional Sash Windows

We are actually the manufacturer of your new windows and doors and we pride ourselves on our bespoke sash window services, quality of workmanship and careful installation, as well as dedicated aftercare. We want to help you get the most out of your home and our expert team will advise and inform you along every step of the way.

Guaranteed no-fuss after-sales service

We want you to be over the moon with your new windows or doors and our promise is simple. If there is something you are not happy with, no matter how small, we will come back and fix it, no quibbles.

Eco-Friendly Credentials

All our workshop machines are designed to reduce energy consumption and CO2 emissions.  We then use envionmentall friendly, sustainable grade A materials for our frames – redwood, hardwood or oak.

Bespoke, tailored service to your needs

Every element of the finished product is based on your exact desires, from the glazing to window furniture to the architraves used.

Your work is NEVER subcontracted - it’s all us

Unlike many other companies, we manufacture our windows and doors in our purpose-built, state-of-the-art Guildford workshop, an then our own full-time fitters will install them.


0800 389 7384

We supply, install and upgrade windows and doors to London & the South-East of England

Though our workshop and showroom are based in Guildford, Surrey, we endeavour to serve as much of the Surrey-East of England, including London, Surrey, Berkshire, Essex, Hampshire, Kent & Sussex.

"6 weeks after the work was completed I wished I'd had it done 10 years ago. Looks good and job well done."

Customer in London, May 2019

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