Tooting sash windows offering exceptional performance

A-rated sash windows and Accoya sash windows installed in properties in Tooting, Colliers Wood and nearby areas

London Box Sash Windows is a family-owned business that has been providing high-quality timber sash windows and casement windows to the London area for over 40 years. We specialise in manufacturing and installing traditional timber sash windows and casement windows, with a strong focus on enhancing energy efficiency while preserving the architectural integrity and kerb appeal of your home.

Our experienced and dedicated team is committed to delivering a service you can trust. Whether you are looking to install new sash windows or would like to replace existing ones, we offer tailored solutions at competitive prices. Each project is handled with precision, ensuring that your expectations are not only met but exceeded.

Our sliding sash window experts manage all aspects of sash window installation. From the design and creation of bespoke sash windows to the expert installation and ongoing replacement services, we have you covered.

Our team of sash window and casement window experts has excellent reviews. One recent client said:

I used London Box Sash Windows for two separate installations over the last year and I have nothing but praise for the company. From the initial contact, through the estimating to the final installations, the people I dealt with were polite, informative, helpful, punctual and hard working. We had a mix of sash and casement windows fitted and the product is absolutely top notch. We had some issues with our builder making new openings for the windows but the advice and flexibility with the fitting dates given by LBSW made the process and the overall look of the windows superb. I’ve used a few tradespeople over the last few years and LBSW are by far the most professional and committed. A company based on wonderful craftsmanship and customer service!

For more details or a fast quote for new sliding sash windows, please contact [telme].

Colliers Wood Quality replacement sash windows & box sash windows

At London Box Sash Windows, we offer a range of traditionally handcrafted replacement sash windows designed to enhance energy efficiency while preserving the architectural integrity of your property.

From bespoke manufacturing to expert installation of sash windows, we ensure the highest quality of products and services.

We are always available to answer questions and provide detailed, individualised quotations for every project. All replacement box sash windows are custom-made and handcrafted to order, ensuring an authentic and precise reproduction.

Every product we manufacture is made to order and installed by our in-house specialists. To ensure your complete satisfaction, all our installations come with a full guarantee, giving you peace of mind and confidence in the long-lasting quality of our work.

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

One client said:

Phenomenal windows and service. We chose to use London Box Sash Windows following a recommendation and couldn’t be happier.The entire process from start to finish was absolutely seamless, from the initial survey, selecting designs that replicated our existing Victorian windows like for like, to the fitting and end result.We were astonished not only by the brilliant quality of the new windows (upgrading from original frames and glass means that the property is now silent, cooler and undoubtedly warmer come winter) but the speed the fitting team worked at and their attention to detail.

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Why choose sliding sash windows in Tooting, SW17?

Tooting in South London is known for its charming mix of period properties, including Victorian and Edwardian homes, which feature classic architectural details that reflect the area’s history.

These older homes often have traditional features like high ceilings, Bay windows, and ornate brickwork, making them ideal candidates for sash windows. Installing or replacing sash windows in Tooting properties can enhance their historic charm while providing modern benefits.

Sash windows are aesthetically pleasing and offer improved energy efficiency and insulation, which is essential in maintaining the comfort of these homes. Additionally, they allow for better ventilation and can be customised to match the property’s original character.

We manufacture all our products at our London factory, just a short distance from where we originally began. Even today, 90 per cent of our window installations are completed within an 8-mile radius of where they are made, and we are committed to maintaining this approach – supporting the local community while minimising our environmental impact.

Tooting Accoya sash windows

Various types of timber are available for making windows, but some are better suited than others. Accoya timber stands out as an excellent option. It is a high-tech, sustainable wood modified at the molecular level through acetylation. This advanced process prevents the timber from absorbing water, making it exceptionally stable and durable. For homeowners seeking long-lasting doors and windows, Accoya is a top choice.

Accoya offers unmatched durability. Class 1 timber lasts longer than traditional hardwoods like oak, and it comes with a 50-year manufacturer’s warranty against above-ground decay and rot. Its longevity makes it a cost-effective investment for any home. Additionally, Accoya is ideal for coatings, ensuring that your windows maintain their pristine appearance over time with minimal maintenance.

Accoya also boasts superior insulation properties, offering about 40 per cent better energy efficiency compared to other hardwoods, reducing both energy bills and carbon footprints.

With its FSC certification and recognition for sustainability, Accoya is durable and eco-friendly, making it an excellent choice for homeowners who want to prioritise both performance and environmental impact.

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:-

Balham
Barnes
Biggin Hill
Brixton
Camberwell
Lambeth
Mitcham
Norbury
Norwood
Streatham
Walworth
Wandsworth

To obtain a quote for new sash windows Tooting, contact us

Would you like some expert advice about timber sash windows or a quote? Please get in touch at [telme] or email [emailme].

Contact our team for sash windows Forest Hill.