At Sash Window Experts, we recognise that double-glazed windows are now an essential feature of the modern home, with many proven benefits over single-glazed period windows.

We work with the latest advances in technology in the double-glazing industry to provide beautiful double-glazed sash windows in hard or soft wood, that have the following advantages.

What Our Customers Say

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Melanie Simpkin
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Excellent work done by the whole team. Great customer service through the entire project. Thank you!
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Megan Russell
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We recently had all of our sash windows double glazed by Sash Window Experts and are very pleased with the whole process. Mark and his team were fantastic from start to finish. They were always on time, polite and incredibly considerate of being in our house. They did a fantastic job of replacing the old Victorian sashes with new double glazed units and we can't recommend them highly enough.
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Geoff P-W
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These guys fully deserve their 5 star status, the work that they do is exceptional. Having bought a new period property with windows that were in need of attention we contacted several companies, and chose Sash Window Experts on the basis of Mark’s original survey and quote. Mark showed his love for repair and restoration during the initial visit, and came up with options and solutions to look at windows and doors in our house. Work started on time, and was completed to a very high standard. Given the size of our project we had a variety of people on site at different times, all of whom were a pleasure to have around, and who have that same love for their craft that Mark has. A special shout out to John, who worked with us on a number of things, and always came up with a great solution. We’d highly recommend Sash Window Experts.
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Robert Lawder
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Mark, Lisa and their team - Steve, Matt, Ollie and Pete repaired 9 badly decayed sash windows on our Victorian house in a conservation area. The work was finished to high quality, beautifully done and beautifully painted. The team was careful and considerate throughout. They kept to time and came in slightly under the quote value, accounting for elements of the original frames that they were able to repair rather than replace. I would wholeheartedly recommend them for work in a heritage setting.
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Simon Pugh
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Sash Windows Experts did a fantastic job replacing our Victorian sashes. The quality of the work and the professionalism of the team was outstanding. Many thanks, Mark and the crew!
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micaela hobbs
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I cannot praise this company enough. Mark and the entire team, who renovated all the rotten, old and drafty sash windows in our small flat, have been amazing. Gary, Steve and Ollie were, without exception, professional, courteous, great craftsmen and clean and tidy. The quality of the windows, both from the workshop and on site renovations is excellent and the style exactly as the old windows once were. Communication was also easy. I can highly recommend this company. Thanks to all the team.
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Tony Kendall
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So glad we used Sash Window Experts for our job….replacing old window sashes for new double glazed ones. Gary and Steve are great craftsmen and lovely people. We would certainly use this company again, and highly recommend it to others.
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Robert Hamberger
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This is the second time we have used Sash Window Experts, and we went back to them for hardwood double-glazing of our second bay window because we were so pleased with how professionally they worked previously, and the excellent results. They were prompt and attentive as ever - real experts in their field. We're delighted with the standard of their work, and would highly recommend them. The windows look great. Update: We have now (May 2024) used Sash Window Experts for the third time for hardwood double-glazed sash windows for our kitchen and second bedroom, to complete window renovation in our flat. They're as professional as ever, prompt and efficient, clean up well after themselves and the work was completed to a high standard in two days, as they said. We continue to recommend sash Window Experts.
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Michael Bennison
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A very professional job, carried out to a high standard. No problems and courteous and pleasant craftsmen. "Did what it says on the tin" Mjb

Benefits of Double-Glazed Period Windows

Greater Energy Efficiency

Recent figures have shown that somewhere in the region of 50-70% of heat in the home is lost through having single-glazed windows. Installing double-glazed windows achieves better thermal performance by trapping a layer of air between two glass panels. It is one of the most efficient ways to improve the energy efficiency of your home.

Lower Energy Costs

Changing your windows from single-glazed to double-glazed sash windows will help you keep more of the heat in your home. This means you can keep the central heating thermostat turned down in order to reach the same internal temperature, saving on energy consumption and utility bills.

Better Sound Insulation

Changing your windows from single-glazed to double-glazed sash windows will help you keep more of the heat in your home. This means you can keep the central heating thermostat turned down in order to reach the same internal temperature, saving on energy consumption and utility bills.

More Home Security

Double glazing is also an effective method to provide a greater level of home security, and the peace of mind that comes from knowing your family is safe at all times. Particularly on the ground floor, modern construction methods and double-glazed window panes will make it much harder for any intruder to gain access.

Easier Maintenance

Timber-framed, double-glazed sash windows have a timeless appeal that perfectly complements older properties and listed buildings. Routine cleaning with warm soapy water is all it takes to preserve your windows. Carry out periodic checks for moisture ingress, and wear and tear and apply a fresh coat of paint where necessary.

Double Glazing for Period Sash Windows

Original sash windows can often be improved without losing their character. Our approach focuses on better comfort, improved performance and careful upgrades that respect period properties.

Can You Retrofit Double Glazing Sash Windows?

Installing double glazed sash windows to replace original single glazing may not always be possible without planning permission, for instance in period properties in Conservation Areas or listed buildings. One way to get around this is to leave the original windows in situ and retrofit double glazing into to the existing sash windows.

Retrofitting double glazing to timber windows is done by removing the existing single panes and replacing them with new slim-line low-profile heritage double glazing. These can be retrofitted into narrow rebates of original timber sash windows. Heritage double glazing uses slimline, low-profile double glazing units with exceptional thermal insulation that will improve their energy efficiency to match the performance of a modern A-rated window.

This alternative type of double glazing installation ensures that important original architectural characteristics of historic properties are preserved while providing the convenience of energy efficiency.

Double Glazing For Sash Windows

Sash Window Experts have more than 30 years of experience in restoring period windows. We can offer beautiful double-glazed hard or soft wood sashes that incorporate warm edge technology that is normally used in modern sealed units while retaining all the essential period features including the original moulding design and horn detail.

All our work is carried out in our joinery workshop, using skilled and experienced craftsmen that share a passion for heritage architecture. Our team will:

  • Supply and fit a pair of new double-glazed sashes into your original box frame
  • Reinstate double-glazed sashes into the original box frame where they’ve been previously replaced with modern aluminium or UPVC versions
  • Fit a full replacement box frame and double-glazed sash windows with traditional pulleys and weights, where these were completely removed

For details about double glazing for sash windows, or any of our other sash window repair and restoration services, please call the Sash Window Experts office on 01403 602701 or fill in the form on our Contact Page to send your enquiry or arrange for a free quotation.

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Arrange a No-Obligation Survey With Mark

Hi, I’m Mark, owner of Sash Window Experts. I’d love to talk to you about restoring period windows. Please fill out the form or call me on 01403 602701 to arrange your FREE no obligation window survey and to discuss your requirements.

Frequently Asked Questions About Double Glazing

Can sash windows be double glazed?

Yes, sash windows can often be double glazed. At Sash Window Experts we fit double glazing into original timber sash frames using slim-line, low-profile heritage double glazing units designed for period properties.

This allows you to improve thermal performance while preserving the traditional appearance and period detail of your sash windows.

Can you retrofit double glazing to existing sash windows?
Will double glazing change the look of my sash windows?
What are the benefits of double-glazed sash windows?
Is double glazing suitable for listed buildings or conservation areas?