Double glazing for sash windows – what you need to know

By Sash Windows
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Your home’s traditional sash windows may look beautiful but do they leave your home cold and draughty? It’s a common complaint that we hear all the time. Unfortunately, it is also one of the main reasons why many homeowners give up on sash windows altogether, choosing modern UPVC replacements instead. But wait – there’s no need!

At Sash Window Experts, we can repair and renovate timber sash windows back to their perfect condition, including draught-proofing and double glazing where necessary. That way, you get the best of both worlds: retention of the charm and character of your original sash windows but with the high performance of modern UPVC double-glazed sash windows.

Our double-glazing services

So, what’s involved in double-glazing your sash windows? We first remove the sash beading and the top and bottom sashes, so that we can assess the condition of the window sill, the box frame and external pointing. If these are in a good enough state of repair, it means that you don’t need to replace the entire window, only the sashes.

We take precise measurements to enable us to create replica sashes, matching the sash horns (where applicable) and inner moulds to the originals. Your new double-glazed units will be made up of two panes of glass with an inert gas in between to dramatically reduce heat transfer via the windows. The new units will then be fitted in accordance with all current building regulations. We install a concealed draught-proof system at the same time, further improving the energy efficiency of your property.

Once the new window is in place, we prime all exposed woodwork and caulk the beading, leaving the window ready for painting. Finally, a centre catch, uplifters, D rings and window locks are fitted, and you will be provided with a fully operational demonstration and advice on how to look after your new double-glazed sash windows.

Double-glazed sash windows in a Conservation Area

Windows are a key element of the visual appeal of a home, and nowhere is this more apparent than in period buildings in Conservation Areas where unique and distinctive architectural features are protected by law. Timber sash windows are an important part of our British heritage and, as such, it is right that they should be preserved wherever possible.

Many homeowners believe that double-glazed sash windows cannot be fitted in Conservation Area homes or in a listed building, but this is not strictly true. At Sash Window Experts, we have many years of experience in ensuring that all the windows we produce and fit are sympathetic to the building and the planning requirements of the area. Exact replicas of the originals almost always receive planning approval from local planning authorities, even with double glazing. Where necessary, we can help with the necessary paperwork to help you gain planning consent for your new windows.

Benefits of double-glazed sash windows

If you are not sure whether to upgrade your sash windows to double-glazed units, let’s have a quick recap of the obvious advantages of doing so.

  • Preserving your home’s period good looks

By double glazing your sash windows, you will not only preserve the visual appeal of your period property, you will also maximise its value when you come to sell. Our process ensures that the key architectural features – architrave, mouldings and other original period features – are retained.

  • Making your home more energy efficient

The double glazing process complies with the requirement of the vast majority of Conservation Areas; it also complies with Building Regulations around energy efficiency and heat loss. Not only will you feel warmer in your home, but you should also see a noticeable reduction in heating bills too.

  • Reducing dirt and noise ingress

Once installed, your double-glazed sash windows will operate smoothly and quietly without rattling in the wind. What’s more, by fitting our draught exclusion system, the level of dust and dirt ingress into the property is reduced, as is the level of noise pollution.

Thanks to the advances of modern technology, there is no need to compromise between period charm and modern home comforts. If you wish to discuss your property with our expert team to see whether double-glazed sash windows can offer you the solution you’re looking for, please get in touch and book your free, no-obligation window survey today.

Contact Us Today for a Free Survey

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.

What Our Customers Say

Helen Thomas
If I could clone you for all the other work we need to do over the next few years, I would! Thank you Mark for having such a good team in place. And huge thank you to Gary, Alex, John and Glen for taking such care of our windows and giving them what they needed after years (decades?) of neglect. Your attention to detail and 'doing it right' was very much appreciated, and your ability to solve problems was awesome. Helen & Tim, Godalming
Roxana Avanu
Amazing service from start to finish, no issues and no drama. The name Sash Window Experts is well chosen. Mark and his team - Gary and John were extremely helpful and professional and the end product - new sash sound proof double glaze windows upstairs and the kitchen triple sash window restored was top quality. I am very grateful to Sash Window Experts.
Amy Clarke
Cannot fault Mark and his team. We replaced the original sashes to our 1890's home with new like-for-like hardwood double glazed sash windows, and apart from being warmer, quieter, cleaner and altogether much smarter, you really wouldn't tell the difference - an amazing feat! They are absolutely beautiful windows, so well crafted and fitted, and the restoration of rot on the original box is imperceptible. Gary was friendly, clean, professional, and safe throughout the fitting, and very thoughtful in causing minimal disruption to the home. Absolutely thrilled with everything from the service to the price to the final finish. Delighted with them. Would recommend in a heartbeat.
Alison Fordham
We were nervous about getting our Victorian French windows restored and had received a ridiculously high quote. Sash Window Experts came in at a good price, gave a timeframe that worked with our schedule and did a great job. All as promised. The fitter, Gary, put the doors back in with great care and took time made sure they worked smoothly and also discussed any queries with us. Definitely made the job value for money. Very happy customers! We are looking forward to beign able to open our doors again and enjoy the garden. Thank you Mark and Co!
Peter Jones
Our house is Edwardian and has the original sash windows from 1906. I really want to make sure that any double glazed windows did not look out of place - so the woodwork, including the side bars etc should still be very thin to match the originals. I was fearing ending up with fat wooden bars but Mark took me to see a previous customer and I was happy to see the woodwork there and it put my mind at rest. We went for the thin Krypton windows. Now the windows are in they look very good and match very well. To be fair to everybody, we will not know until the winter how well they remedy our warmth and condensation issues in the house but are confident we made the right choice. Other suppliers would not do separate window panes and instead would only do a large window with a false wooden strip down the middle to make them look like two. We did not want that. The carpenters, Steve and Gary turned up on time (early actually) and got on with the job very efficiently and left no mess behind. I am very happy with the company and the windows.
Natasha Birley
Mark and his team are amazing. They restored our sash windows and doors. Mark is really knowledgeable and passionate and explained the process to me so I knew exactly what they would be doing. Once the work commenced I was amazed by how well they draft proofed the windows. They took so much care and the guys were polite, tidy, timely and a joy to have around. I would absolutely recommend the team to anyone thinking of restoring their windows, they look AMAZING!
Rachael Smith
Absolutely outstanding quality, value for money and service from Rob. This is the second time Rob has done work for us and we can highly recommend him. The sash windows are like new! Thanks Rob 😀
Jon Reed
Used these guys to do a total refurbishment on the windows of my 1870s Victorian Villa style house. Incredibly happy with the work and the guys doing it are just superb. On time to the minute every day, clearly take pride in the work they do and super friendly. Would not hesitate to use again!
Geoff Parsons
Excellent service from Mark. The windows installed last week. Look elegant and noise reduced considerably.
S Attewell
Very pleased, very sound work done, very professional and friendly team. Highly recommended!!