Exceptional sash windows Kingston-upon-Thames

A-rated box sash windows & casement windows fitted to residential and commercial properties in Kingston, Norbiton, or nearby areas

London Box Sash Windows is your trusted local specialist in sash window installation. We craft elegant, high-performance sash windows using Accoya wood and A-rated double glazing, offering exceptional energy efficiency and long-lasting durability.

Our designs preserve traditional sash windows’ slim, classic aesthetics, enhancing the architectural charm of properties in Kingston and surrounding areas. Our headquarters are just a few miles away, and we pride ourselves on delivering a personalised service. We collaborate closely with homeowners to ensure each installation perfectly suits their style and functional requirements.

As a Which? Trusted Trader since 2011 and with outstanding Google reviews, our sash window team is recognised for exceptional craftsmanship and customer care. Our strong reputation for quality reflects our unwavering commitment to excellence, making us the preferred choice for creating or restoring beautiful, efficient sash windows.

One recent customer explained:

Thrilled with our 3 new box sash windows. The quality of the windows is excellent and worth every penny. I thought the price was very fair compared to other quotes I received given the quality of the wood that is used, the length of the guarantees and the ease of the company to deal with. The process from start to end has been seamless. Everyone we interacted with was superbly knowledgeable, responsive and helpful – from Harry, the sales person who helped explain all the design considerations and options very clearly, Judith in the office helping getting us booked in and Andy, the fitter. Andy consulted us on any bits where needed explaining clearly the decision that was needed and his work was to an excellent standard and he was very clean and tidy and respectful of our home.

Contact our sliding sash window specialists at 020 8648 4230.

Hampton Wick: A-rated sliding sash window replacement

At London Box Sash Windows, our timber sash windows are more than just a traditional architectural feature – they are a timeless statement of elegance that elevates any home’s aesthetic. Combining classic design with modern functionality, our sash windows offer the perfect solution for homeowners who value luxury and energy efficiency.

Our dedication to craftsmanship and attention to detail ensures that every sash window meets the highest standards, blending tradition with modern comfort and durability.

To see examples of our recent sash window installation projects, explore our portfolio.

Double-glazed sash windows provide the beauty of traditional timber frames while significantly enhancing insulation and heat retention, ensuring a warm and comfortable indoor environment, especially in colder seasons.

One customer added:

Can only recommend! Everything went extremely smoothly. The team were always available to answer any questions and walk us through the entire process to get our new window installed. Also very competitively priced.I will be reaching out to them soon to get other slash windows replaced.

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Thinking about wooden sash windows in Kingston-upon-Thames, KT1

Kingston-upon-Thames, a historic market town on the River Thames, boasts a mix of architectural styles, from charming Victorian and Edwardian homes to sleek, modern developments. Many properties feature classic period details such as bay windows and intricate brickwork. Homeowners in Kingston often focus on preserving the traditional character of their properties while incorporating modern upgrades for comfort and efficiency.

Accoya wood offers many benefits, making it an ideal choice for sash windows. Its exceptional dimensional stability means it resists moisture-related issues. Accoya’s natural resistance to decay ensures durability, as it is impervious to insects, fungi, and rot. Environmentally conscious homeowners will appreciate its sustainable origins, as it is sourced from FSC-certified forests and requires less maintenance, reducing its ecological footprint.

This long-lasting material is a sound investment, backed by a 50-year guarantee for exterior use and 25 years for ground contact. Accoya also offers superior UV resistance, helping it maintain its aesthetic appeal even under prolonged exposure to sunlight. Additionally, its ability to hold paint or varnish for extended periods means your windows and doors will remain beautiful with minimal upkeep.

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

Our sliding sash window installation Kingston

Does your home feature timeless sash windows that are beginning to show their age? If they are becoming draughty, noisy, or no longer performing effectively, it may be time for an upgrade. Revitalise your property with replacement sash windows from London Box Sash Windows.

Our expertly crafted windows are designed to preserve the charm of your home while significantly enhancing its energy efficiency, reducing noise, and boosting overall comfort. Combining traditional aesthetics with modern functionality, our windows ensure your home retains its classic appeal while benefiting from improved performance and durability.

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:-

Richmond Upon Thames
Strawberry Hill
Teddington
Twickenham
Whitton

To get a quote for new or replacement sash windows throughout the London Borough of Kingston upon Thames, call now

For further details about our sash window installation or to request a free quote, please call 020 8648 4230 or email info@londonboxsash.com.

Kickstart your project for new sash windows Raynes Park.