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.

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.

You

Excellent result from these guys- they are extremely efficient, turned up on time, did a great job with an old rotten window, cleaned up afterwards and were polite and friendly

Pete Stoneman

After getting quotes from three sash window companies, we chose London Box Sash to replace six old, single glazed sash windows. Every step of the process was great and the new windows have massively improved the look of the house from the street – as well as making it better insulated for noise and warmth.

At the initial home visit Jake clearly explained the different options available to us and their respective costs. I didn’t feel rushed or pressured with an upsell. Harry took measurements at the pre-manufacture survey, confirmed our chosen options and explained the installation process.

We were also invited to visit the factory, and it was great to see the windows being made locally.

Andy, the window installer, was absolutely fantastic. He arrived on time every day, was a hard worker, and showed real attention to detail. He also took the time to explain what he was doing at each stage of the install.

I would not hesitate to recommend London Box Sash to others and will reach out to them when we need other windows replacing.

Dominic Elliott

I had all of our front windows replaced with London Boxsash wooden sash windows and couldn’t be more delighted.

The window demonstration was really informative and I could tell from the start that the windows were far superior to any others I’d seen.

The booking process was very smooth and the installation team were by far the most professional, fast and tidy I’ve ever witnessed.

This isn’t a cheap product but represents superb value for money.

Carole Plessy

Very professional, stress free. Beautiful finished sash windows, very smooth mechanism. Strongly recommended

Virginia Carter Leno

We are so pleased with our new windows! London Box Sash did a great job installing new timber sash to replace our very sad and poorly fitted uPVC windows. They were incredibly professional from start to finish, I had many opportunities to ask questions about materials and specification, and I was confident everything would be manufactured and installed by their own team (rather than outsourced to some unknown company/installer). The new windows look fantastic – would 100% recommend! Thank you Jake, Judith, Harry and the installation team.

Rob Davies

They were professional, friendly and efficient at every stage of the process. The installation went really well and we’re very pleased with the result. Warmer rooms and an unexpected improvement in sound insulation, deadening traffic noise. Good experience all round, would recommend.