Service
New casement windows London
Casement windows are one of the most versatile and enduring timber window styles available – and for London homeowners looking for new wooden casement windows that are practical, well- made, and right for their property, they are often the natural choice. Repair a Sash specialises in designing and manufacturing new timber casement windows for homes across London, from period terraces and conservation-area properties to higher quality contemporary renovations.
Every window we produce is made to the specific requirements of your home. Whether you are replacing tired or poor-quality windows with something better, or commissioning new casement windows as part of a wider building project, we focus on getting the proportions, the details, and the finish exactly right.
Timber casement windows for London homes
A casement window is side-hung on vertical hinges, opening outward from the frame. Unlike sash windows, which slide vertically, casements open wide for ventilation, close tightly against the frame for weather performance, and can be configured to suit almost any opening size or shape.
Timber casement windows have been a feature of London properties across all architectural periods – from Georgian townhouses and Victorian terraces to Edwardian villas and well-designed contemporary homes. Timber suits the character of period buildings in a way that uPVC cannot replicate, and for homeowners who care about the appearance of their property as well as its performance, it remains the material of choice.
For period and character properties in particular, the details matter. The sight lines, the profile of the frame, the hardware, the glazing configuration – all of these affect how the finished window looks and how well it fits its surroundings. We work carefully to ensure that new casement windows complement the existing character of the building, whether that means matching original details or specifying something suited to a more contemporary scheme.
Styles of new casement windows
We manufacture new casement windows in three broad style categories, and within each we offer two primary construction types.
Traditional casement windows follow the proportions and detailing associated with period architecture. They suit Victorian, Edwardian, and Georgian properties, and are typically specified where visual continuity with existing or original windows is the priority.
Heritage casement windows are produced to a more exacting period specification, intended for properties where accuracy of detail is particularly important – conservation-area homes, listed buildings, or properties where a close match to surviving original windows is required.
Contemporary casement windows are suited to well-designed modern homes, extensions, and renovation projects where a cleaner, less ornate aesthetic is desired, while retaining the warmth and quality of timber construction.
Within any of these styles, we offer two main construction formats:
Flush casement windows sit level with the outer face of the frame when closed. This creates a clean, flat appearance that reads well on period buildings and is often associated with traditional or heritage specifications. They are often the more suitable choice where a traditional or heritage appearance is important.
Stormproof casement windows have a rebated sash that closes over the frame, providing a robust weather seal. They offer strong performance in exposed positions and are a practical choice where weather resistance and draught exclusion are priorities.
Our services
Renovation on time
and within your budget
When new casement windows are the right choice
Full new manufacture is the right route when existing windows are too deteriorated to repair or renovate cost effectively, when the existing windows are poor-quality later replacements that are worth improving upon, or when a homeowner wants a complete visual and performance upgrade rather than a patch repair.
It is also the appropriate choice when like for-like or heritage-sensitive manufacture is required – for example, where original casement windows need to be replaced in kind to satisfy planning requirements or to maintain the consistency of a period elevation.
Not sure whether new windows, renovation, or a glazing upgrade is the better option?
If your existing casement windows are broadly sound but suffering from draughts, sticking, or rattling, our Casement Windows Draught Proofing & Renovation service may offer a more economical route to improved performance without the need for full replacement. If the existing frames are in good condition but you want to upgrade to double glazing, our New Double Glazed Casement Sashes service allows new double-glazed units to be fitted within the retained original frame. Where windows are beyond economic repair or renovation, full new manufacture is likely to give better long-term value.
A free survey is the clearest way to understand which route is right for your property.
Benefits of new timber casement windows
Ventilation, light, and ease of use
Casement windows open wide along their full height, making them one of the most effective window types for natural ventilation. They allow good levels of daylight and can be opened and closed easily, including with the option of restrictor stays for controlled ventilation. For rooms where airflow and ease of use matter, casements are a practical and well tested choice.
Energy efficiency and comfort
New timber casement windows, manufactured to current performance standards and fitted with appropriate glazing, significantly reduce heat loss compared to older single-glazed originals. When closed, the sash presses tightly against the frame, creating an effective seal that limits unwanted air infiltration. Combined with double glazing, slimline double glazing, or vacuum glazing, the result is a noticeably warmer and more comfortable interior.
Security and weather performance
New casement windows are fitted with secure multi-point locking hardware as standard, offering considerably better security than older or worn fastenings. Stormproof casements in particular perform strongly in exposed positions, and both flush and stormproof formats can be specified with high-quality ironmongery suited to the style and security requirements of the property.
Appearance and long-term value
A well-made new casement window, correctly proportioned and finished, improves the appearance of a property immediately and contributes to its long term value. Timber ages well, can be refinished when needed, and carries a quality of presence that alternative materials do not replicate. For period and character homes in London, the visual result of well-specified new windows is often one of the most visible and lasting improvements a homeowner can make.
Materials, glazing, and finish choices
All of our new casement windows are manufactured in timber. The choice of species affects durability, character, and finish, and we will advise on the most suitable option for your property and budget during the survey.
Accoya is a modified softwood with outstanding stability and rot resistance, widely specified for external joinery where long-term performance and low maintenance are priorities. It carries an extended guarantee and is an excellent choice for painted casement windows.
Red Grandis is a responsibly sourced hardwood with a consistent grain, good natural durability, and a smooth surface that takes paint and stain finishes well.
Oak offers a strong natural grain and excellent longevity. It suits properties where a more traditional or natural timber character is desired, and works well in both painted and stained finishes.
Engineered Redwood is a cost-effective and dimensionally stable option for painted casement windows, where the performance of an engineered softwood is appropriate to the specification.
For glazing, we offer single glazing where a traditional specification is required, double glazing for improved thermal performance, slimline double glazing where a narrower unit is needed to maintain original sight lines, and vacuum glazing for applications where maximum performance in a slim profile is the priority. Not all glazing options are appropriate for every window or
property – we will advise on what works best for your situation.
We offer a range of frame finishes and ironmongery to complete the window. Hardware is selected to complement the style of the casement, and we can match or coordinate with existing fittings elsewhere on the building where needed.
New casement windows for listed and conservation properties
For properties in conservation areas or those that are listed, the specification and installation of new casement windows require additional thought. Planning permission or listed building consent may be needed depending on the extent and nature of the work, and the requirements will vary by property and local authority.
We can manufacture heritage-sensitive wooden casement windows designed to meet period-appropriate detailing requirements – including flush casements in timber species and finishes appropriate to the building’s age and character. We are happy to advise on what is likely to be required for your specific property, though we would always recommend confirming relevant consents with your local planning authority before work begins.
Our new casement window process
Free survey and advice
New timber casement windows, manufactured to current performance standards and fitted with appropriate glazing, significantly reduce heat loss compared to older single-glazed originals. When closed, the sash presses tightly against the frame, creating an effective seal that limits unwanted air infiltration. Combined with double glazing, slimline double glazing, or vacuum glazing, the result is a noticeably warmer and more comfortable interior.
Security and weather performance
We begin with a free, no-obligation survey at your property. We assess the existing windows, discuss what you are looking to achieve, and advise on the most appropriate route – whether that is full new manufacture or an alternative service better suited to your situation.
Measuring and style matching
Where new timber casement windows are the right choice, we take precise measurements and record the key details of the existing openings and, where relevant, surviving original windows. This ensures that new windows are made to fit accurately and reflect the appropriate proportions and detailing for the property.
Timber, glazing, and finish selection
We guide you through the timber options, glazing choices, and finish specifications, helping you arrive at the combination that best suits your property, your priorities, and your budget.
Manufacture
Your windows are manufactured to the agreed specification. We do not use generic off-the-shelf units – each wooden casement window is made for your property and the specific opening it will occupy.
Installation
Our installers fit the new casement windows carefully, ensuring correct operation, effective weather sealing, and accurate alignment within the opening.
Final checks and guarantee
Once installed, we carry out final checks to confirm that everything is operating as it should – opening and closing correctly, locking securely, and sealing effectively. All our work is fully guaranteed.
FAQs about new casement windows in London
Yes, well. Timber casement windows have been part of London's architectural landscape across
Georgian, Victorian, and Edwardian periods. Made correctly, with appropriate proportions and
detailing, they complement the character of period homes in a way that alternative materials do
not. They are also often preferred or required in conservation areas and on listed buildings,
where the use of timber is part of the planning context.
Flush casements sit level with the outer face of the frame when closed, giving a flat, clean
appearance that suits period and heritage specifications. Stormproof casements have a rebated
sash that closes over the frame, providing a more robust weather seal and stronger performance
in exposed positions. Both are available across our traditional, heritage, and contemporary style
ranges.
Yes. We work from careful measurements and observations of your existing windows – or, where
original windows survive elsewhere on the property, from those details – to ensure that new casement windows reflect the appropriate proportions, profiles, and hardware. The aim is always
for new windows to fit the building naturally.
We offer new casement windows in Accoya, Red Grandis, Oak, and Engineered Redwood. Each
has different characteristics in terms of durability, appearance, and cost. We will advise on the
most suitable choice for your property during the free survey. For larger and more demanding
projects we can manufacture the windows in any timber of your choice.
Yes, particularly with double or slimline double glazing. New casement windows with upgraded
glazing significantly reduce heat loss compared to original single-glazed windows. The way a
casement closes – pressing the sash firmly against the frame – also helps limit unwanted air
infiltration. The extent of the improvement will depend on the glazing specification and the
specific construction of the window.
Yes, to a meaningful degree. New windows with double or vacuum glazing offer better acoustic
performance than older single-glazed originals, and the improvement is particularly valued by
homeowners on busier streets. The specific reduction will depend on the glazing specification
chosen.
Listed building consent or planning permission may be required before replacing windows in a
listed building or, in some cases, a conservation area. Requirements vary by property and local
authority. We can manufacture heritage-appropriate casement windows designed to meet period
detailing requirements, and we are happy to advise on your situation. We always recommend
confirming any consent requirements with your local planning authority before proceeding.
Renovation is worth considering when existing windows are structurally sound and the issues are
limited to draughts, rattling, or ease of operation. Full replacement becomes the more appropriate
route when existing windows are heavily deteriorated, when they are poor-quality later
replacements worth improving upon, or when a complete visual and performance upgrade is the
goal. A survey gives you a clear answer for your specific windows.
Why homeowners in London choose Repair a Sash
We work specifically in the London market, and a significant proportion of our projects involve period and character properties where the details genuinely matter. That focus shapes how we approach every project – from the care taken in measuring and specifying to the quality of the installation and finish.
Our advice is always honest. If renovation or a glazing upgrade is a better fit for your situation than full new windows, we will tell you. We will not recommend more work than your windows need – and when new casement windows are the right answer, we will make sure they are made and installed to a standard that does justice to your property.
Book your free survey
If you are considering new casement windows for your London home, the most useful first step is a free, no-obligation survey. We will assess your existing windows and openings, discuss what you are looking to achieve, and give you a clear recommendation on which route – new manufacture, renovation, or a retained-frame glazing upgrade – is right for your property.
Get in touch with the team to arrange your survey or to ask any questions about the service.
