Sash Windows

bespoke sash windows London

Introduction to Sash Windows

By Sash Windows

The windows of a house are a key part of any building. They keep the house well lit, provide ventilation and give a view of the outside world from the comfort of your home. 

Sash windows are a charming feature that are growing in popularity. They not only work as beautiful heritage features in period properties, but also for new builds that are looking for traditional style windows. 

But what are sash windows? Where do they come from? And why are they so popular? Let us introduce you to our favourite window feature.  

What are sash windows? 


Sash windows are windows that have a vertical opening and you push them up or down to open them. They come in two parts, called sashes, that slide up and down using a pulley system that sits in the window frame. Then a weight will keep the window balanced and open, helping the up and down movement. 

These mechanisms which give the sash window its uniqueness are all hidden within the frame, so can’t be seen from the outside or inside of your property. Traditionally they would contain single glazing, now however double-glazed units can be encased in the sashes just as easily. 

Where do sash windows come from? 


There is some debate about the origins of sash windows. Some experts think that they are a Dutch invention, however, the oldest surviving sash windows can be found in the UK at Ham House in Richmond-on-Thames in London.

Architecture historian H.J Louw believed and wrote in his book Architectural History Vol. 26 (1983), that the sash window was championed in England but couldn’t conclude who the original inventor was. Regardless of who invented them, the sash window grew in popularity in England during the Georgian and Victorian periods, with most of the period examples in London being from this time. 

Where can I see examples of sash windows? 


Historic houses such as Ham House mentioned above offer great examples of sash windows. Being popular designs in Georgian and Victorian buildings means that you can wander down various London townhouse streets to see beautiful examples of sash windows. 

What are sash windows made from? 


Originally sash windows were exclusively made from wood and timber. Recently however they can be made from a variety of materials to suit any homeowner or architect’s budget. 

Some of the most popular are: 

  • Timber
  • uPVC
  • Aluminium

Why are sash windows so popular? 


Sash windows take us back in time and they evoke old-fashioned values. Many people find them a charming and beautiful addition to the aesthetic of their home. As a heritage feature, they add value to your property and also promote longevity in design.

Practically, they have excellent ventilation as they can open from the top and bottom at the same time. With modern sash windows being double glazed you don’t have to sacrifice comfort for style. It’s no surprise that sash windows are gaining popularity among architects and homeowners alike. 

Here at Tusk Joinery, we love sash windows and our team of artisans is experienced in the installation, repair, refurbishment and supply of sash windows and other timber products. If you would like to talk about your property and how we could help you please contact us on: 0207 157 9624 or

Alternatively, fill out our contact form and one of our team will be in touch.