Sash Windows
London's Timber Sash Window Specialists.
Sash Atelier specialises in precision-made timber sash window replacement for London period homes, conservation areas and premium refurbishments. Four sash families - Traditional, Heritage, Vacuum-Glazed and Triple-Glazed - made to specification to match original sightlines while delivering tested modern thermal, acoustic and security performance.
The collection
Traditional Timber Sash Windows London
Faithful Victorian and Georgian box sash windows with cords, weights, pulleys, putty-line glazing bars and modern draught sealing.
Best for: Victorian, Georgian and Edwardian homes needing authentic box sash character.
Heritage Sash Windows London
Conservation-led timber sash windows for listed buildings, heritage townhouses and sensitive London conservation areas.
Best for: listed buildings, conservation areas and like-for-like replacement projects.
Vacuum Glazed Sash Windows London
Slim vacuum glazed sash windows for London homes where heritage sightlines and modern insulation both matter.
Best for: slim glazing where period appearance matters but better insulation is needed.
Triple Glazed Sash Windows London
High-performance timber sash windows for London projects requiring excellent insulation, comfort and acoustic control.
Best for: high-performance refurbishments where thermal and acoustic comfort are priorities.
Complete Replacement First. New Sashes Where Necessary.
Where the property and planning context allow, a complete new timber sash window is usually the best long-term solution. Replacing the full window - frame, box and sashes - gives the cleanest result, the best control over performance, and the most durable finish.
When full replacement is unlikely to be approved, the secondary route is new made-to-measure sashes fitted into the retained box frame.
Our survey is designed to establish which route is right for the property - starting with full replacement as the preferred standard.
01
New Timber Sash Windows
For full window replacement where the existing frame can be removed and replaced with a complete new timber sash window - frame, box and sashes - made to measure for the opening.
02
Replacement Timber Sashes
Where full replacement is unlikely to be approved, the existing box frame stays and the moving sashes are replaced with new made-to-measure timber sashes - improving glazing, seals and operation while keeping the original frame.
03
Conservation and Planning Support
For listed buildings and conservation areas, the survey confirms which route is likely to be approved and we prepare the drawings and specification the application needs.
Traditional Appearance. Tested Modern Performance.
Our timber sash window systems combine traditional sightlines and period detailing - slim profiles, glazing bars, sash horns and authentic mouldings - with tested modern performance: thermal insulation, acoustic comfort, weather resistance, draught reduction, security hardware and durable factory-applied finishes.
Sash Windows for London Period Homes
London's period housing stock - Victorian houses, Georgian properties and Edwardian homes - was built around the timber box sash. Replacing these windows is as much about character as it is about performance.
Within conservation areas and on listed buildings, the detail matters: matching the original sightlines, recreating glazing bars, horns and mouldings, and keeping the proportions and character of the property intact. We design each sash to read correctly from the street, not just from inside the room.
Bespoke Details Made to Match Your Home
Every sash window is specified to the property, not pulled from a standard size range.
- Made-to-measure timber sashes
- Narrower or non-standard sash sizes where required
- Glazing bars
- Sash horns
- Traditional mouldings
- RAL colours
- Ironmongery options
- Factory-applied finishes
- Draught seals
- Security hardware
Start With a Survey, Not a Guess.
We start every project with a measured survey of your existing windows. The survey first checks whether complete replacement is possible and appropriate for the property - this is our preferred route wherever it can be done well.
Where full replacement is unlikely to be approved, the secondary option is new made-to-measure timber sashes fitted into the retained frame.
- Complete window replacement
- Replacement timber sashes
- Condition of the existing frame
- Planning and conservation context
- Slim vacuum glazing
- High-performance glazing
The survey allows us to recommend the strongest viable route for the property, with complete replacement considered first and new sashes in the retained frame only where full replacement is unlikely to be approved.
Sash Windows in London - Answered.
Can I replace sash windows in a conservation area?
In most London conservation areas, timber sash windows can be replaced on a like-for-like basis, matching the original sightlines, glazing bars, horns and mouldings. Each council and each property is different, so we start with a measured survey and advise on the approach most likely to be acceptable for your street and building type.
Can I replace only the sashes and keep the existing frame?
Yes. Where the existing box frame is sound, we can supply made-to-measure replacement timber sashes that drop into the original frame. This is often the right route for period homes where the frame is part of the property's character and removing it would be disruptive or unnecessary.
Are timber sash windows suitable for listed buildings?
Our Heritage Timber Sash Windows are designed for listed and conservation-sensitive properties, with authentic profiles, traditional mouldings, glazing bars, sash horns and slim sightlines. We provide drawings and specification documentation to support a listed building consent application.
Can sash windows be double glazed?
Yes. Modern timber sash windows can be double glazed, vacuum glazed or triple glazed, depending on the property and the thermal target. Vacuum-glazed units are particularly useful where you need better insulation but want to keep slim, period-correct sightlines.
What is the difference between traditional and heritage sash windows?
Traditional Sash Windows recreate the classic Victorian and Georgian box sash for period homes that aren't formally protected. Heritage Sash Windows go further on profile accuracy, sightlines and documentation, and are designed specifically for listed buildings, conservation areas and like-for-like consent applications.
How much do sash windows cost in London?
Sash window pricing depends on size, configuration, glazing specification, finish and the scope of installation. After a measured survey we provide a detailed, transparent quotation per window, so you can see exactly what is included.
Do you make narrower or non-standard sash windows?
Yes. Every window is made to measure, including narrower or non-standard sash sizes where the property requires it. We match existing openings, glazing bar layouts and mouldings rather than forcing standard sizes onto a period façade.
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