Beautiful sash windows for Streatham homes

We manufacture and install A-rated box sash windows in Streatham, Norbury, or nearby areas

If you are looking for sash window installation, London Box Sash Windows is your ideal choice. We are a local company specialising in handcrafted sash windows made from various high-quality materials, including Accoya wood and A-rated double-glazed glass units.

Our windows are meticulously designed to retain the timeless charm of traditional sash window aesthetics while offering outstanding energy efficiency and durability.

Choosing London Box Sash Windows for your sash window installation ensures you benefit from top-tier materials that resist rot, decay, and warping. Our double-glazed sliding sash windows provide exceptional insulation, significantly lowering energy bills. Additionally, all our sash windows are manufactured in our London factory just a few miles away, allowing us to maintain strict quality control.

Our team consists of highly experienced tradespeople committed to delivering excellent service and craftsmanship. By opting for London Box Sash Windows, you can enhance the beauty and efficiency of your home with our expertly crafted sash windows, ensuring they stand the test of time while complementing your property’s aesthetic; see what our customers say about us in our reviews.

One recent client 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.

Please get an instant quote or contact us at [telme].

Norbury sash window company to fit Accoya sash windows

Our sash windows and casement windows are ideal for both modern and traditional properties, combining classic style with contemporary performance. The timeless sash design enhances the character of any home, while our use of Accoya timber ensures the superior durability and functionality that modern materials can provide.

Accoya is a specially treated softwood enhanced through an innovative process called acetylation. This treatment strengthens the wood and renders it resistant to insect damage, making it an exceptionally durable option. With proper care, Accoya sash windows can last over 80 years and require minimal maintenance from homeowners.

Our Accoya windows are sustainably sourced and fully recyclable, positioning them as some of the most environmentally friendly options. By choosing our Accoya sash windows, you are investing in quality and longevity and making a responsible choice for the environment. This perfect blend of style, strength, and sustainability ensures that our sash windows will enhance your home for generations.

See some of our sash window installations by viewing our portfolio.

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Sliding sash window installation in Streatham, CR4

In South London, Streatham is renowned for its green spaces and Victorian and Edwardian architecture. The area boasts a mix of period homes, including terraced houses and elegant flats, many of which feature traditional sash windows integral to their character.

These original windows may suffer from wear and tear over time, leading to issues such as drafts, poor insulation, and difficulty in operation. By investing in replacement sash windows, homeowners can significantly enhance energy efficiency, reducing heating costs and improving comfort throughout the year.

Upgrading to these high-quality windows can preserve a property’s historic appeal while ensuring they meet contemporary standards of performance and sustainability, making them a smart choice for residents looking to improve their homes.

Please read our blog: Sash window vs other styles: What’s ideal for London homes?

We install Accoya and timber sash windows in Streatham.

Here at London Box Sash Windows, we are passionate about windows. Our sash windows come in various types, each with unique features.

Our timber sash windows are made using modern materials and techniques to improve energy efficiency. Options such as double glazing, weatherstripping, and insulated frames help reduce heat loss, enhance insulation, and lower energy bills. Additionally, these windows offer effective noise reduction, especially important in a busy city like London. When combined with double glazing, our timber sash windows create a quieter living space.

High-quality London Box Sash windows are designed for smooth operation, incorporating counterbalanced mechanisms or spring systems for effortless opening and closing, requiring minimal force and maintenance, ensuring ease of use over time.

Another client said:

London Box Sash Windows just completed the installation of our new, double glazed windows across our mid-terraced Victorian house. We couldn’t be happier with the experience, from start to finish. Jake took a lot of time during the initial consultation, explaining the options available and impact on costs. We had four quotes in the end, roughly in the same price range and decided to go with LBSW due to their professionalism and responsiveness. Harry did the technical inspection pre-installation and Judith kept us updated throughout the process. At the scheduled day of installation, Audris arrived punctually (on the minute!) and his and David’s work was spotless. They both worked extremely hard, precise and left every room they worked in tidy (we didn’t have to do any cleaning ourselves!)… Our house is much warmer, quieter and with no more annoying draughts, we don’t regret the investment for a second.

Jane Watkins

Great service, great quality product and polite professional staff. Very pleased with final result. Seamless from start to finish. Would highly recommend anyone looking to replace their sash windows to use this company.

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.

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

Balham
Lambeth
Lower Norwood
Upper Norwood
West Norwood

To receive a quote for Streatham replacement sash windows, call now

For a high-performance sliding sash windows or box sash windows quote, please call [telme] or email [emailme].

For sash windows Tooting, contact our team now.