How To  Measure Glass!
In the glass trade we use the following terminology and criteria for measuring glass.
The first being a TIGHT SIZE this is obtained by  measuring from wood to wood on your window or door frame.
The second being a GLAZING SIZE which you obtain by knocking off 4mm to 6mm tolerance from the tight size.
We recommend allowing  4mm tolerance on small squares up to 250mmx300mm, any sizes above this we would  allow 5mm-6mm tolerance.
Please note these guides are based on standard 12mm rebates/beading! If your rebates/beading are smaller you will have to make special tolerances.

When ordering the glass you must state the GLAZING SIZE on your order.

Do you require double glazing?

Please provide the THICKNESS of the double glazed unit you require.

Glass Safety

All glass supplied by Knowsley Art Glass Ltd can be toughened to meet current safety laws in door and door-sides.

However for further information regarding the use of safety glass you can visit www.planningportal.gov.uk and view approved Document N.

When ordering any glass off our website please make sure you provide the correct sizes including the correct tolerances. We can not take any responsibility for sizes that have been provided incorrectly! If you require any further information on measuring up please contact us we are always here to help.