Heritage Slim Double Glazing

Our heritage double glazing uses a slimline double glazed insulated unit, that is made up of two panes. The space between the gap ranges from 4mm to 8mm and is filled with an inert gas (Argon, Krypton or Xenon), this gas helps to keep the warm in and the cold out.

Just like our Noise reducing glass, all our windows are bespoke and hand-made, using all traditional manufacturing methods. 

Please click here to see the datasheet of our Heritage Slimline Krypton gas filled units, showing the energy improvement. This unit has a centre pane 'U' value of 1.3 W/m2k

A sample cross section of how we install the slimline heritage units into our joinery.

This means that we keep to original look while upgrading the everything to last for many more years.

With our slimline heritage units we can install these into our bespoke sashes, even with curves.


Our solid glazing bars, keep everything held together traditionally and will never fall off! 

This is one of the main reasons why we do not use stick on glazing bars, as they become defective very quickly, fall off and can rot.

© 2018 London Sash Windows & Doors Ltd. All rights reserved. 

London Sash Windows & Doors Ltd,: registered as a limited company in England and Wales under company number: 10832389

London Sash Windows & Doors Ltd,

​3 Wedmore Street,


N19 4RU

T : 0208 150 7153

E: info@LSWD.co.uk

Monday to Friday: 

8:30am to 5:00pm.

Saturday: By appointment only.

Sunday: Closed.