Bespoke sash windows in Forest Hill

Replacement sash windows and wooden sliding sash windows installed in Forest Hill, Sydenham and nearby areas

Installing Sash Windows In Forest Hill since 1980!

London Box Sash Windows is your go-to local expert for sash and replacement sash windows. We specialise in crafting bespoke sash windows using premium Accoya wood and A-rated double glazing. Our sash windows blend traditional elegance with modern energy efficiency and long-lasting durability.

Accoya wood, known for its sustainability and resistance to rot, decay, and warping, is the ideal material for sash windows. Combined with high-performance double glazing, our box sash windows offer outstanding insulation, helping to lower energy bills while maintaining timeless charm.

Our sash window team is highly rated on Google reviews and has received top feedback on Which? Trusted Traders, where we have been members since 2011.

One recent customer said:

Very efficient local team, first to book appointment and good contact from Judith in the office. Very thorough presentation from Jake and ability to offer a discount for speedy installation. Andy installed windows and he was professional & friendly. A very clean and methodical approach. They also have an after service care should anything happen which is very reassuring .I have already recommended them to two friends of mine.

All our sash window products are made locally at our London factory near Wimbledon, with 90 per cent of installations within eight miles of production, supporting the community and reducing our environmental impact.

Visit our showroom to explore our sash windows and get expert advice from our knowledgeable team to find the perfect match for your home.

What makes our Sydenham sash window company different?

At London Box Sash, we are passionate about preserving the timeless beauty of sash windows while enhancing your home with modern products. Our skilled team focuses on using the highest quality materials and providing flawless sliding sash window installations that respect the traditional aesthetics of your property. This dedication to craftsmanship and attention to detail has made our services highly sought after and widely recommended.

John Ellis founded our first workshop in 1980, and since then, we have proudly specialised in crafting double-glazed sash windows and doors designed for lasting durability.

With a commitment to traditional craftsmanship and modern innovation, we have grown steadily over the decades. By continually investing in state-of-the-art machinery and refining our techniques, we ensure that every product we create meets the highest quality standards, blending timeless aesthetics with superior performance for homes across the region.

We take the time to explain the intricacies of sash windows, from their history to their functional benefits, ensuring you are fully informed at every step. Whether you are restoring an older property or adding character to a new build, our team is committed to helping your home find its perfect style.

Another client said:

I was very happy with the bespoke casement window they installed in my property. The company also agreed to repair it promptly after a number of years. London box sash install high quality timber windows and seem to care about their customers.

For images of our recent sash window installation projects, please check out our portfolio.

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We fit Accoya sash windows and wooden sash windows in Forest Hill, SE23

Forest Hill in South-East London is known for its charming, tree-lined streets and beautifully preserved period properties, many of which feature classic sash windows integral to their architectural character.

From Georgian townhouses to Victorian terraces, these homes reflect a timeless elegance that makes Forest Hill a sought-after area for homeowners. However, due to the age of many of these properties, original sash windows may have become worn or inefficient over time, leading to drafts, condensation, or difficulty in operation. R

Replacing sash windows with high-quality, energy-efficient replicas can enhance the comfort and aesthetic appeal of these heritage homes. Accoya wood undergoes an innovative acetylation process, making it exceptionally durable and resistant to decay, rot, and insects. This increased lifespan is complemented by its remarkable dimensional stability, ensuring smooth operation and a longer life.

Accoya’s low maintenance is a key benefit, as its reduced water absorption extends the life of finishes. Its thermal insulation properties improve energy efficiency, making it an eco-friendly option that can lower energy costs. Accoya wood also supports sustainability, offering both the environmental advantages of softwoods and the durability of hardwoods, earning C2C Gold certification.

Forest Hill A+ rated sliding sash window installation

Double-glazed sash windows can significantly enhance your home’s energy efficiency. According to the Energy Saving Trust, installing A-rated double-glazed windows in a single-glazed semi-detached home can save homeowners around £195 per year.

The insulated air space between the glass panes in double or triple glazing helps reduce heat transfer by slowing down convection and conduction, keeping your home warmer for longer and lowering heating costs, making it a smart investment for energy-conscious homeowners.

Please see our blog: How long do double glazed windows last?

Fritha Hookway

So happy with the whole experience with London Box Sash. Our new windows look amazing. The whole process was very thorough, competitive in price and really quick for install – which was a nice surprise as the lead time was halved from what we’d thought it might be. The team were also exceptionally helpful when one of the old windows were were planning to replace was severely damaged during a storm. They came to board it up free of charge in the interim while the new one was still being built. Simon in particular was really helpful – a huge thank you to the whole team.

Bev Roberts

Once again an excellent experience from start to finish !If only every company was as brilliant as London Box Sash Windows .i will definitely be coming back to get the rest of my windows replaced by them

Olivia Fothergill

Absolutely fabulous service from start to finish. Top notch communication and friendly too! Andy did our sash windows for us and left the house in spotless condition and did an incredible job. We are thrilled with the results

marie Chiron

Living abroad presently, no regret having London Box Sash window replacing eight old windows with double glazed ones including two leaded windows. My initial contact, Jake, makes me at ease with the process. Judith who presented the quote, had it very well explained. Harry who is in charge of organising the actual work, upon inspection of my flat, gave me an initial details situation on potential problems i.e position of radiators, sink, gas meter etc, however worked around those problems with the engineer. Harry’s honesty was appreciated. The team of installers managed by Harry was equally good. My tenants are very happy with those new windows, they can feel the difference in temperature. From the video received, I am impressed with the end product. Would recommend London Box Sash Windows to friends and neighbours. London box sash window is a company you can trust.

Jason Ward

Excellent service throughout. High quality window. Prior survey very straight forward. Actual installation highly professional – clean workmanship, tidy and efficient. Very impressed and highly recommended.

Benjamin Cloue

Amazing experience and strongly recommend London Box Sash!From quoting with Jake, surveying with Harry, fitting with David and contract discussions with Judith, the whole team has been fantastic and provided a great customer experience.The team was always punctual and the fitting was done very fast and super clean (thank you David!).

Irena Stanwell

It is my second time I am using London Box Sash Windows replacement service. I was first of all pleased to learn that the same people were still working in the company and it was a pleasure to deal with the team who I still remembered since my first interaction with the company few year back.The performance of the LBSW was outstanding from the beginning to the end, punctual, knowledgeable, friendly and very professional. Explained all options etc and the performance on the day was seamlessWould highly recommend with no reservations..

Louise Norman

I am very satisfied with both the products and service provided by London Box Sash Windows. I was reassured by Murray’s knowledge and experience and he was helpful and patient when I was working out what I wanted. He listened, and there was no “hard sell”. Harry did the survey and Anjelo and Rafal the installation. They were all punctual and courteous. The installation was carried out quickly and efficiently, and Anjelo and Rafal took care with my property and tidied up after themselves. The aftersales care provided by Murray was excellent. Nothing seemed to be too much trouble. Having windows replaced is not a cheap option and involves a fair amount of upheaval, but I felt throughout the process that I could trust LBSW to provide value for money and make it as smooth as possible. I am very pleased with the end result. My new bay window looks great and is totally in keeping with the period of my property, including the “swept” heads. I immediately started to feel the benefits of having double-glazing in terms of heat retention, no draughts and noise reduction. I will also benefit from the improved security and low maintenance it offers. I would not hesitate to recommend London Box Sash Windows.

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

Beckenham
Catford
Dulwich
Forest Hill
Honor Oak Park
Lewisham
Norwood

Would you like a quote for sash windows or casement window installation Forest Hill? Call London Box Sash now

For an estimate for casement windows or replacement sash windows near you, please call [telme] or email [emailme].

Call our team for sash windows Putney.