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

Traditional Wooden Casement Windows

We design, manufacture and install traditional wooden to the highest standard.

Wooden casement window fitting and installation

We specialise in building and fitting high-quality, sustainable and tailored windows, with casement windows being one of our most popular options (along with traditional sash windows). We have over 200 years of experience installing casement windows for customers across London, the Home Counties and the South East. All our timber casement windows are built to order from our workshop in Guildford, Surrey and installed by our own specialist fitters.


As part of our commitment to environmentally friendly production, we exclusively use high-quality timber for our casement windows. We use the very popular, long-lasting and durable Accoya timber. Our casement windows are available with a choice of glazing options, long-lasting window furniture, draught exclusion, three coats of breathable micro-porous acrylic paint and a 50-year warranty against timber rot. Our team of experts will talk you through all the varied casement window customisation options to make sure your windows are perfect for your needs, preferences and building.


Where traditional casement windows already exist, we can replace top, side or bottom hinged casement windows if yours have started to deteriorate or rot, and add the benefit of double glazing and draught exclusion.

Request a FREE Quote

Complete the form below for a free, no obligation quote.

We’ll call you back within two working days.


0800 389 73 84

Accoya Wood Casement Windows

Accoya is a sustainable, durable wood which is the only option for our traditional wooden casement windows. Accoya wood gets its strength from a non-toxic process known as acetylation, while being harvested from sustainably sourced radiata pine trees.


Accoya wood casement windows won’t warp like other traditional woods and will keep the heat in due to their low thermal conductivity. Along with these great benefits, it is also less susceptible to UV damage. All of these advantages of choosing Accoya wood are backed by our 50-year guarantee that comes with all of our Accoya products.

Double Glazed Casement Windows

Whether you are looking to install new casement windows, or upgrade your existing older windows, double-glazed casement windows are a necessity. Not only helping to draught and soundproof your home, but also saving you up to 25% on energy bills. 


If you currently have single-glazed wooden casement windows, we can add the benefit of double-glazing while preserving the traditional aesthetic of your home. All the double glazing offered by Sash Windows has a low-level U-value, ensuring they adhere to current building regulations.

Why would I replace rather than restore my existing casement windows?

While we do offer a number of options around renovating your current casement windows – such as double glazing, replacement of casement hinges, window sills, box frames or window furniture – we find that most of our customers prefer the quality of a full window replacement.


The benefits of installing new casement windows are:


Sash Windows Glazing Team Pink IconImprove heat retention, noise reduction and reduce draughts

Sash Windows Support Team Pink IconReduce your carbon footprint with energy-efficient windows

Sash Windows Joinery Team Pink IconUpgrade to the latest in window technology, glazing and security

Sash Windows Painting Team Pink IconTake advantage of more durable, long-lasting timber frames

Sash Windows Glazing Team Pink Icon Protect against mould, rot, warping or jamming

Sash Windows Support Team Pink Icon  All of our work is fully guaranteed and insurance backed

Why Choose The Specialist In Traditional Sash Windows

We pride ourselves on our bespoke casement 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 every step of the way. Get in touch for further information or a free quote today.

Guaranteed no-fuss after-sales service

We want you to be over the moon with your new windows or doors, so 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 environmentally 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. From here, our own full-time fitters will install them, giving you complete oversight of the project from workshop to fitting.


CALL 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 South-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

Articles about Sash Windows

A Guide to Sash Windows through the Victorian Era

The Victorian Era was about reviving classic house architectural designs and styles. Gothic, Tudor and Italianate were some of the traditional British designs that saw popularity during this era. John Ruskin, an art critic during the Victorian Era, led the revival of traditional architecture which used better windows and doors building materials to forge a…

When is the Best Time of Year to Book Sash Window or Door Work?

As the seasons and weather shifts, homeowners often consider home repairs or upgrades. Windows and doors are common focus areas contributing to a home’s safety, energy efficiency, aesthetics, and functionality. But when’s the best time of year to get work done at home? In this blog, we’ll explore the best time to replace windows and…

The Specialist in Traditional Sash Windows is ISO 9001 Certified

The Specialist in Traditional Sash Windows is proud to announce that we have achieved our ISO 9001 certification. This is great news, as the certification is recognised worldwide as the international benchmark for quality within an organisation. It is a further indication that our valued customers can trust us to transform their homes’ windows and…