Double Glazed Sash Windows

Yes, it is possible to have double glazed wooden sash windows!

Single glazed windows only offer limited insulation, however, double glazed sash windows will be able to provide your home with better thermal insulation, reduction in energy bills and will help to make your home much warmer during winter.

It is important to note that not all double glazing is the same, and there are different levels of thermal insulation. Our friendly experts talk you through the various different components that go into providing you with efficient double glazing.

Whatever solution you choose, your new double glazed sash windows will provide 3 to 5 times more thermal insulation than your current single glazed windows.

  • 3 to 5 times more thermal insulation
  • Reduces heating costs
  • Provides a warmer environment
  • Complies with current building regulations
  • Improves security

Watch the video below and discover seven things you never knew about sash windows.

Our new double glazed sashes are fully painted and decorated in our own, in-house workshop. The paint finish is micro porous, using the latest paint technologies, which provides an extremely clean and smart appearance and allows the wood to breath and expel moisture – which minimises the risk of rot.

For more information about having your sash windows double glazed, simply give us a call on 020 8017 1632 or book a free, no obligation survey & quote using the form on this page.


Watch Our Video

See what our clients are saying.

Book a FREE Survey & Quote with
London’s #1 Sash Window Specialist.

Give us a call now on
020 8017 1632

Double Glazed Sash Windows

We fit all different shapes and sizes.


Want To Know More About Sash Windows?

Just click one of the boxes below to get some answers.

Watch Our Video

Discover seven things you never knew about sash windows!

Book a FREE Survey & Quote with
London’s #1 Sash Window Specialist.

Give us a call now on
020 8017 1632

See What Our Clients Say…

“The windows look very smart and are much warmer – the double glazing is very effective, the installation was relatively smooth and problems were overcome without too much trouble.”

Patrick Cordroy, Chiswick

Download Our FREE Brochure

No email required

  • Browse dozens of case studies at your leisure
  • Be inspired with our range of stunning, authentic sash windows
  • Discover why The London Sash Window Company is London’s #1 sash window specialist


020 8017 1632

Your information is secure with our

Privacy Policy




Your enquiry has been received and one of our team will call from 020 8017 1632 shortly.


Our office hours are 9am - 5:30pm, Monday to Friday. We aim to respond immediately to all enquiries submitted during office hours, or within two hours of opening for all other enquiries.


When we call, one of our team will clarify your requirements, answer any immediate questions you have, and arrange a convenient time for an expert to visit you for a no obligation survey and quote.


While you wait for our call, why not continue to browse our site? Check the FAQs for answer to the most common questions, or be inspired with our sash window gallery!