Elevate your project with new heritage windows

At Sash Window Conservation, we can design any window or door, so long as it’s traditional. Whether your project is giving a new lease of life to a historic building, or providing a heritage feel to a new build, we will ensure that you achieve your desired end result.

We have a range of glazing and performance features available, and will work together with you to help choose the best solution for your project.

Product Features

Why choose new windows

How would your project benefit from new windows?

Our traditional craftsmanship and thoughtful design process means you will have the advantage of the efficiency and security of new windows, whilst retaining a heritage-style aesthetic.

Get in touch


A major advantage of installing new windows is having the option of modern security. We also offer options with increased levels of security, depending on your individual needs. We will review this with you and decide on the best option, whether this be added features or our Sash Secure 240 product.


With design standards becoming evermore stringent, we will work with you to ensure your design fits within these requirements. We can make full sized samples and models to help receive planning permission in our Kent-based factory. Our designs are simultaneously functional and traditional.


Our windows offer U-values as low as 1.2 (W/m2/K) double glazed, to 5.0 (W/m2/K single glazed. Draughts account for 65% of the total energy lost, so our windows are draught proofed to EN 1026/BS6375-1 Class 3. We also offer acoustic glass to reduce sound levels and provide better insulation.

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
Residental historic home with red brick and traditional white sash windows

New heritage windows designed to your specification

At Sash Window Conservation, we provide bespoke and unique solutions on a project by project basis, working together with architect and contractor customers to develop a functional specification based on their individual needs. Our new windows can be made to any traditional design, with a full survey and reporting service to ensure the best fit, and 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.

No compromises on aesthetics or efficiency

Not only are our windows thermally efficient, offering U-values as low as 1.2 (W/m2/K) and ensuring your project is compliant with modern environmental standards, but their designs maintain historic integrity and meet London Authority design standards.

We offer both double and single glazed products depending on your project’s requirements, as well as the option to add acoustic glass and increase sound insulation. There is also the chance to upgrade to our ultra-secure product, the Sash Secure 240.

Front of a historic building showing arched sash windows

Case Studies

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

Who we’ve worked with