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The history of sash windows in the UK

Sash windows are a quintessential feature of British architecture, they have a rich history that spans over several centuries. These windows, characterised by their movable panels or "sashes" slide either vertically or horizontally and have evolved significantly since their creation in the late 17th century. This post delves into the origins, development, and enduring legacy of sash windows in the UK.

Lovely image of a sash window

Origins and Early Development

The exact origins of sash windows are somewhat unclear, with debates about whether they were first developed in England or brought over from continental Europe. However, they are widely believed to have been introduced in the late 17th century. The earliest known reference to a sash window in England dates back to 1670, during the reign of King Charles II.

The Restoration Period (1660-1688)

The Restoration period (1660-1688) was a significant time for sash windows in the UK. This era saw the return of the monarchy under Charles II, bringing with it a revival of interest in classical architecture. The sash window became a prominent feature in buildings of this time, replacing the older casement windows. Sash windows offered several advantages over casements, including improved ventilation, ease of opening and closing and how they are easily cleaned.

Georgian Era (1714-1830)

The Georgian period marked the golden age of sash windows in England. During this time, sash windows became a defining feature of British architecture. They were widely used in both residential and public buildings, including the iconic Georgian townhouses that still grace many UK cities today. Georgian sash windows typically featured small panes of glass held together by wooden glazing bars, arranged in a grid pattern. The "six over six" configuration, with six panes in the upper sash and six in the lower, was particularly common, however there are many other variations.

Victorian Era (1837-1901)

The Victorian era saw further evolution in the design and construction of sash windows. Advances in glass manufacturing allowed for larger panes of glass, leading to a reduction in the number of glazing bars. This period also introduced the "two over two" configuration, which featured two larger panes of glass in each sash. Victorian sash windows often included decorative elements, such as ornate window surrounds and stained glass. weights used inside the windows made even large heavy glass easy to manoeuvre.

Edwardian Era (1901-1910)

The Edwardian period continued the trend of larger glass panes and simpler designs. Edwardian sash windows often featured a "six over two" configuration, with six smaller panes in the upper sash and two larger panes in the lower sash. This era also saw the rise of the Arts and Crafts movement, which emphasized craftsmanship and the use of natural materials. As a result, many Edwardian sash windows were made from high-quality timber and featured intricate detailing.

Post-World War II

The post-war period brought significant changes to the construction industry, including the introduction of new materials and building techniques. While traditional timber sash windows remained popular in many older buildings, the use of metal and plastic windows became more common in new constructions. However, the enduring appeal of sash windows ensured their continued use in heritage buildings and conservation areas.

Modern Day

Today, sash windows remain a beloved feature of British architecture. Advances in technology have led to the development of modern sash windows that combine the traditional aesthetic with improved performance. Modern sash windows are available in a variety of materials, including timber, uPVC, and aluminium. They often feature double or triple glazing for enhanced energy efficiency and sound insulation. at traditional sash windows we however only focus on timber widows to keep with the heritage of the property.


The history of sash windows in the UK is a testament to their enduring appeal and adaptability. From their early use in Restoration era buildings to their prominence in Georgian, Victorian, and Edwardian architecture, sash windows have evolved to meet the changing needs and tastes of British society. Today, they continue to be a popular choice for homeowners and architects alike, valued for their timeless elegance and practical benefits.

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