Upgrade your project with new single glazed windows

At Sash Window Conservation, we are aware of the restrictions you may face when upgrading the windows on an historic property. With this in mind, we offer customers the option to purchase our traditionally crafted single glazed windows.

Our team will work together with you to ensure the new windows blend seamlessly with other windows or the overall aesthetic of your project, as well as meeting any planning requirements.

Product Features

Why choose new single glazed windows

How would your project benefit from new single glazed windows?

Though single glazed windows will never be as thermally efficient as double glazed, installing new windows will almost certainly improve on your project’s current U-values. They will also provide modern security solutions, plus are more durable and easier to clean.

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Though the design of your new single glazed windows is traditional, your project can benefit from modern security features such as locking systems. We can discuss the individual security needs of your project and consider additional features if required.


With design standards scrutinised more than ever when it comes to historic buildings, we will visit your project and use traditional methods to ensure our products match up perfectly with the original. We can make full sized samples and models to help you achieve planning permission in our Kent-based factory.


By installing new windows your project will benefit from draught proofing to BS6375 which eliminates up to 65% of the energy loss, thus providing an optimum level of thermal efficiency for a single glazed window.

Our Buying Process

At Sash Window Conservation, we aim to keep the buying process as simple and straightforward as possible, giving you the peace of mind to focus on your project. Read more about how it works below.

Share your goal with us

When you contact us, we will arrange a call to run through your specification and ideas. You can then share any documents or drawings you have of your project, and what you’d like to achieve with the end result.

We will take this and see what we think is realistic and would work best for your project, timescale and budget.

We will then share our thoughts with you and see how they match up with your vision.

landscape image of university of the arts in london using traditional sash windows

We may pay you a visit

We may arrange a visit to ensure that the bespoke design or refurbishment plan that we have in mind will be just right and fit with the rest of the building and its neighbours.

We can then make any necessary adjustments and begin preparing your bespoke quote.

Canal side of Jamie Oliver HQ, Regent's Canal, King's Cross using new windows retaining the traditional sash window aesthetic

Providing your quote

Once your specification and requirements have been agreed upon, we will put together a bespoke quote. This will include a price per window so that you know exactly what you’re paying for, a range of options to ensure you choose the best solution for your needs, together with our own recommendations based on your individual project.

Our quote will also suggest ways in which you could save money, to help you to stay within your agreed budget, whilst getting maximum value from your order.

Society of Antiquaries building using traditional timber sash windows, also showing the arched entrance

Creating your bespoke design

Following your approval of our quote, we will get to work on creating your bespoke design in our Staplehurst factory.

Once our team have created a selection of samples, you will be offered the chance to visit our factory to review them before we go ahead with the final product.

university of the arts in london using traditional sash windows
White sash windows on a traditional red brick building, showing the arched black doors

New single glazed windows for your historic building project

At Sash Window Conservation, we offer traditional methods to ensure aesthetic authenticity with your single glazed windows. We can make any design of single glazed window, so long as it is traditional, providing functional solutions based on your individual project’s needs. To ensure the best fit, we can carry out a full survey and reporting service, and provide bespoke advice to make certain you’re getting best value for money.

Having our own joinery factory and full team onsite in Staplehurst, Kent, means we can provide full scale models and samples to help achieve planning permission for your project, and also offer our customers a factory visit to check you’re happy with the product we’ve designed.

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Modern solutions with traditional aesthetics

With BS 6375-1, our new single glazed windows offer your project the best in thermal efficiency for their level of glazing and are compliant with modern environmental standards, whilst maintaining the historic aesthetics and integrity of your project’s traditional design.

We work together alongside main contractors and architects to ensure your chosen design will achieve planning permission and meet London Authority design standards where applicable.

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Single glazed traditional sash windows on a cream building

Case Studies

See how our bespoke heritage products have enhanced previous projects with testimonials from our valued customers below.

Who we’ve worked with