Georgian, Victorian or Edwardian?
Your windows will tell you — start by looking at the glass.
Understanding how to identify sash window types is essential when restoring, replacing or upgrading windows in London properties. Each architectural period introduced distinct styles, and recognising these differences ensures that any work carried out maintains the character and value of the building.
If you are planning work on your windows, you can also explore our timber sash window services or speak with our window fitters in London for expert guidance.
Why Identifying Sash Window Styles Matters
Choosing the correct sash window style is not just about aesthetics. It affects planning approval, property value and overall visual consistency. In conservation areas across London, matching original designs is often a requirement.
Before making any decisions, it is helpful to understand how sash windows work so you can recognise structural differences as well as visual ones.
The Three Styles at a Glance
Georgian Sash Windows
Georgian sash windows are known for their symmetrical appearance and classic proportions. The most common configuration is the six-over-six design, meaning each sash contains six smaller panes.
This style reflects the limitations of early glass manufacturing, where large panes were not widely available. As a result, multiple smaller panes were used to create a balanced and elegant look.
Georgian windows are typically found in properties built between 1714 and 1830 and remain highly desirable in many London homes.
Victorian Sash Windows
Victorian sash windows differ significantly from Georgian designs. Advances in glass production allowed for larger panes, resulting in the popular two-over-two configuration.
This style allows more natural light into the property and creates a simpler, more open appearance. Decorative features such as sash horns are also more common in Victorian windows — check the corners where the two sashes meet, and see our guide to sash window horns for what to look for.
If your property dates from the mid-to-late 19th century, it is likely to feature this type of sash window.
Edwardian Sash Windows
Edwardian sash windows combine elements of both Georgian and Victorian styles. A common layout is six-over-one, with six small panes in the upper sash and one large pane below (six-over-two is also found).
This design offers a balance between traditional detail and improved light flow. Edwardian windows are often found in early 20th-century London properties.
Use It As A Guide
Layouts can vary from house to house, so treat this as a guide rather than a rule. But get the style right and your new windows match your house.
Other Variations and Details
In addition to pane configuration, several other features help identify sash window types.
Glazing Bars and Their Thickness
Georgian windows need many bars to hold their small panes, while Victorian designs, with larger panes, need far fewer.
Sash Horns and Decorative Elements
Little curved horns are common on Victorian sashes. Our guide to sash window horns explains what they are and why they matter.
Frame Proportions and Depth
Period windows were proportioned deliberately — see why we're called Golden Ratio.
Opening Mechanisms and Detailing
Weights, cords and pulleys are hidden inside the frame — see how sash windows work.
Each of these elements contributes to the overall style and should be carefully considered when carrying out refurbishment or replacement work.
Matching the Right Style
When replacing or upgrading sash windows, it is essential to match the original design as closely as possible. This is particularly important in listed buildings and conservation areas.
Our guide on choosing the right sash windows explains how to balance style, performance and materials, and our sash window styles page shows the period designs we make.
Modern Materials with Traditional Design
While maintaining traditional appearance is important, modern materials can significantly improve performance. Accoya timber, for example, offers exceptional durability and resistance to moisture, making it ideal for London properties.
As approved Accoya manufacturers, we produce timber sash windows that replicate original designs while delivering long-term reliability.
Professional Advice
Identifying sash window types correctly can be challenging without experience. Working with specialists ensures that any work carried out respects the original design while improving performance.
For tailored advice, visit our London sash window specialists page or explore our refurbishment guide.
Send Us A Photo
Not sure which style your windows are? Send us a photo. We make and restore timber sash windows to match your home — get a free quote or call 020 3488 1695.
Understanding sash window styles allows you to make informed decisions that preserve your property's character while benefiting from modern improvements.