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?

Christine Haight

I found London Box Sash Windows through an online search.With my previous company, I did not get any Fensa certificate and the quality of the wood was inferior to the one used by LBSW for similar prices.They offer a 10% discount for their Standby Schedule Saving which gives very good notice for the client as well. I am very pleased with my double glazed window and the people at LBSW are very helpful.Christine Haight

Judy Carlisle

Both salesman and surveyor were straightforward, helpful and answered all questions.Installers were very efficient, worked very hard, cleaning thoroughly.Astonishingly job completed in 6 hours.The only failing was forgetting to move a chest of drawers.Judith was friendly, very helpful and reassuring

Doxy

We are delighted with our new windows. From our initial enquiry onwards everything was dealt with in a thoroughly professional, efficient and respectful way. A special mention of Andy, our fitter, whose craftsmanship and attention to detail was amazing.

Tasha Spencer

Jake provided a great consultation and really listened to my requirements. He was confident, yet gentle with his approach and so knowledgable. I received multiple quotes from providers which honestly felt like a waste of time, as they didn’t seem to listen to my needs of wanting timber only. London Box Sash Windows stood out among them all, especially for their expertise and care in period properties. Really competitive pricing as well! Cannot wait to use and would highly recommend!

Nicholas Black

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.

D Pryer

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.

edward Davis

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.

Dieter Gatzke

Needed a couple of old aluminium windows replaced with box sashes. Found recommendation for London Box Sash Windows Ltdon Which? Trusted Traders website (where they came top for our local area with over one hundred 5* reviews). Three days after the first phone contact, Jake came to our house to quote for the job. He took his time to take us through the various product options and even brought a sample sash window to demonstrate those options (all without any of the often quite annoying hard selling tactics). The quote price wasn’t cheap but within our expectations, and therefore we decided to go ahead with this company. We were given the option to either go for a scheduled installation date 10 to 12 weeks into the future or to go on a stand-by list. We opted for stand-by and a week later Harry (installation manager) visited to take the exact measurements for the window production and to reconfirm all the chosen options. About 2 weeks later, we were given an installation date.The actual installation was done by Andy over 2 days (1 day per window). On both days he started work at 7.30am, properly preparing the room with dust sheets and covering all carpets, before even touching his tools. He worked both days non stop until about 4pm. Andy was very pleasant to have in the house. He took the time to explain the details of the installation and patiently answered all of our many questions.The best, however, was the finished product. 2 gorgeous wooden box sash windows that are perfectly balanced, so that you can actually lift the solid and quite heavy sashes with just one finger!I wish that we had used London Box Sash Windows Ltdfor the replacement sash windows at the front of our house, a job which we had done about 6 years ago. Although those were of good quality, they are nowhere close to the ones that we had done just now.Without hesitation, I will recommend London Box Sash Windows Ltd to friends and neighbours and only keep quiet about this great company to the people I don’t like …

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 020 8648 4230 or email info@londonboxsash.com.

Call our team for sash windows Putney.