Premium Putney sash windows

We install and replace A-rated box sash windows & casement windows in Putney, Barnes, or nearby areas

Installing Sash Windows in Putney since 1980!

Welcome to London Box Sash, your trusted expert for sash window installation near you. We specialise in crafting beautiful, high-performance sash windows using Accoya wood and A-rated double glazing, ensuring enhanced energy efficiency and lasting durability.

Our designs maintain the slim, elegant features of traditional sash windows, seamlessly complementing the architectural heritage of Putney homes.

As a local sash window company, we take great pride in producing our windows just over two miles away, offering a truly personalised service to each client. This proximity allows us to work closely with homeowners, ensuring that every installation meets your unique style and functional needs.

Our sash window team consistently receives excellent ratings on Google reviews and has been a proud member of Which? Trusted Traders since 2011, earning top feedback for our craftsmanship and customer service. Our long-standing reputation for quality and reliability speaks to our dedication to delivering exceptional results for every project.

One recent customer said:

I have bought windows from London Box Sash twice now – the service is unmatched. Having had quotes from a series of other providers, LBSW kept coming out on top for me. The quality of the windows is extremely high, and they have made a massive difference to the feel of my home. The double glazing is excellent, and the installation was swift and professional. A huge thanks from a very happy repeat customer.

Get an instant quote for sash windows or call our team now on [telme].

Barnes sliding sash windows for your home

At London Box Sash, our timber sash windows are not just a traditional architectural feature; they are a hallmark of elegance that enhances the first impression of any home. These windows blend classic design with modern functionality, offering an ideal solution for homeowners seeking to maintain a luxurious aesthetic while improving energy efficiency.

By opting for double-glazed sash windows, you can enjoy the charm of traditional timber frames while benefiting from superior heat retention and insulation. This combination is crucial for maintaining a comfortable indoor environment, particularly during colder months.

Our expertise and passion for excellence guarantee that your sash windows will meet the highest standards, providing you with the perfect blend of tradition and modern comfort for years to come.

For images of recent sash window fittings, please see our portfolio.

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Why choose our wooden sash windows in Putney, SW15?

Putney is located along the banks of the River Thames in southwest London. It is known for its beautiful green spaces, such as Putney Heath and Wandsworth Park. The area boasts a mix of charming Victorian and Edwardian properties and modern developments.

Many of these period homes feature original sash windows, which, while aesthetically pleasing, may require replacement due to age-related wear and tear, poor energy efficiency, or damage from the elements.

Our sash windows are made from Accoya wood. Accoya is a treated softwood created through an acetylation process that enhances its natural properties. Unlike traditional timber, Accoya requires minimal maintenance to maintain its appearance. This process alters the wood’s cell structure, making it resistant to insects and fungi, preventing them from ingesting the material.

Accoya offers outstanding thermal efficiency, showcasing excellent thermal retention and reflection properties. Combined with double glazing, Accoya windows help reduce energy bills while ensuring year-round comfort.

The acetylation process also provides remarkable durability, resisting decay and harsh weather conditions. Its lifespan exceeds 60 years with little maintenance. Accoya has a lower carbon footprint than many alternatives and is sustainably sourced from fast-growing, FSC-certified pine in New Zealand. Its recyclability remains intact, as it can even be composted after use.

Please see our blog: What are the advantages of wooden window frames?

Putney sliding sash window installation

By blending timeless craftsmanship with modern technology, we can transform your home’s aesthetics while significantly improving its energy performance.

Our skilled team specialises in crafting high-quality timber double-glazed sash windows and casement windows, ensuring that each installation preserves the unique beauty of your home. We are dedicated to delivering exceptional craftsmanship and take pride in producing windows that not only enhance the visual appeal of your property but also contribute to its energy efficiency.

Aalia Khan

London Box Sash have done a fantastic job. I’ve now used their services around four times, and on each occasion I’ve compared options—yet they consistently stand out as the best by far, offering a great balance of competitive pricing, excellent service, and beautifully crafted products.

Firstly, their windows are stunning, with a wide range of hardware options. I’ve had both sash and casement windows installed, all made from high-quality Accoya wood, which really shows in the finish.

Secondly, the installation team are excellent. They take real care to make good around the windows—whether that’s repainting walls or fixing tiles—so nothing looks unfinished. They’re punctual, respectful of your home, and work efficiently and professionally, often completing installations within half a day.

Thirdly, the entire process—from ordering to survey to installation—is smooth and well-managed. The team feels consistent and personal, with people like Judith handling bookings and payments, and Harry and Jake carrying out surveys. It has the feel of a trusted family business, with knowledgeable staff always on hand to offer helpful advice on the best options.

Lastly, their aftercare is outstanding. Even with more complex installations (my Victorian walls weren’t the easiest!), they are quick to problem-solve and always willing to return promptly if needed.

Overall, I wouldn’t hesitate to recommend London Box Sash.

Christopher Wylde

Very happy with the whole experience here from start to finish. Professional and honest outfit that will do excellent work. Very happy to take on bespoke needs so if you have something slightly different to standard requirements these are the people to go for!

UPDATE: used these guys again for my new house. Nothing has changed: still an excellent service. Nothing is too much trouble, great experience from start to finish. Great aftercare tips upon request. Nothing is too much trouble. You definitely get what you pay for with these guys.

Tracy Clark

Simply outstanding! Everyone we dealt with was super friendly, polite and very efficient. The installation was seamless and they covered everything up with dust sheets and plastic. The windows are stunning and so easy to open. I highly recommend them.

gervase

We recently had our sash windows installed by London Box Sash Windows, and the whole experience was excellent.

Anjelo and Raf, the installation team were respectful, professional, and did a wonderful job. Jake who looked after us on the sales side, was helpful and knowledgeable, Judith kept it all organised.

The sash windows themselves look absolutely beautiful and have completely transformed the appearance of the house. We’ve had a number of compliments from people passing by, which speaks for itself.

Brad V

You do not need to worry because this company make, supply and fit the best windows around.
I have used them well over 10 years on various projects and i would not go elsewhere. What can i say other than ‘superb in every respect’
Their choice of wood and paint is astonishing as they never move or crack and look like they were fitted only yesterday even though my original windows from them are well over 10 years old, i have never had to do anything to them.
I cannot express how brilliant their products are and, their service is fantastic. I would never use any other supplier.

Phil Bowen

We have used London Box Sash Windows twice in the past four years. We can’t speak highly enough of the customer service, the ease of the sales process, the quality of the work and the professionalism of the window fitter. We now have a beautiful set of windows in our house and would not hesitate to recommend them.

Helen Jenkins

I found London Box through Which Trusted Traders and was so glad that we chose them to replace a bathroom window in 2025 following it being damaged through an attempted break-in. We were so impressed with the service given by the company through the assessment visit by Simon, the contact and support through the office of the lovely Judith and the amazing work done in a single day by the wonderful Andy to replace the window. He worked tirelessly all day and cleaned and tidied up beautifully afterwards. Because of their impressive service installing this window we employed them to replace the bay windows on our house which was a much bigger and more complicated job because of issues to do with the state of the bay itself but London Box were more than up to it. This time Harry came to measure up and Judith in the office continued to keep us informed and up to date with the process. Angelo and Raf did a fantastic job on the day installing the new windows. It was a very difficult job but they did amazingly well and we couldn’t be happier with the windows as well as with every aspect of our involvement with the company. Would throughly recommend this company and not hesitate to use them again in future.

Andrea Melville

I have used London box sash windows three times. The product stands the test of time. We had upstairs bedroom windows installed in 2014. Lounge in 2021 and bathrooms 2026. They open as easily today as when installed. Service is professional. Everything left clean. When some water got in some glass it was replaced quickly with no fuss. A great experience and a great product.

Book a sash window survey in any of the nearby locations:-

Acton
Barnes
Earls Court
Fulham
Roehampton
Wandsworth
West Brompton
Wimbledon

Do you need replacement sash windows or box sash windows in Putney? Contact our team now

We can provide a consultation and free quote for sash windows or casement windows. Please call [telme] or email [emailme].

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