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

Double Glazed Sash Windows

We provide specialist sash window services including installation, replacement and upgrades.

How we can transform your sash windows

Here at the Specialist in Traditional Sash Windows, we have over 200 years of experience installing new and replacement sash windows to customers across London, the Home Counties, and the South East. All our wooden sash windows and box frames are built to order from our workshop in Guildford, Surrey, and installed by our own specialist fitters.

As part of our commitment to sustainable production, we exclusively use high-quality timber for our sash windows. We NEVER use uPVC plastic for our frames – the manufacture of which uses 8 times more energy than timber windows. In particular, we specialise in the use of Accoya for our sash windows, a beautiful, natural wood that is vastly more durable and sustainable than polluting plastic alternatives.

Our work is fully guaranteed, with up to a 50-year timber warranty against rot for added peace of mind.

The benefits of installing new sash windows:

  • Re-instate the classic look of period homes and add value to your property
  • Maintain the character of your house – we always ensure the rules of listed buildings are adhered to.
  • Replace warped, jammed or hard-to-open window frames
  • Improve heat retention and reduce draughts with double glazing
  • Upgrade to the latest in window technology and security (our supplied security locks are insurance-approved & child safe)
  • Improve airflow and operation
  • Reduce noise through the use of acoustic safety glass

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


For the perfect, bespoke sash windows, we offer a number of customised options from materials to aesthetics. Our friendly staff are here to guide you through the process so that you get exactly what you want at a competitive price. You will be advised on choices regarding:

  • Timber – while we exclusively use wood for our traditional sash windows, you do have a number of timber options to choose from. These include grade A red wood, which is a softwood, and our most popular long-lasting and durable Accoya timber.
  • Glazing – glass options include Double Glazing, Acoustic Glass, Toughened Safety Glass, Laminated Safety Glass and Sandblasted (Satin) Glass. We will discuss with you the most suitable option for your property. For bathroom or speciality windows, we can install any patterned panes from our specialist suppliers, Barron Glass & Pilkington Glass.
  • Paint Colour – although most of our customers choose traditional white, we offer a number of paint colour options. In all jobs we apply three coats of long-lasting M.V.P (micro-porous) acrylic paint).
  • Window Furniture – We supply a full range of window furniture in many finishes to suit your specific needs, including Fitch Lock or Brighton Lock, Sash Lifts, ‘D’ Handles and Dual Position Security Bolts. These items are available in Brass, Chrome, Satin Chrome, Satin Nickel and Antique Brass finishes.

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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Our Accreditations