Secondary Double Glazing Measuring Guides

See our guides on how to measure for a lift out and hinge glass unit, vertical slider unit and horizontal slider unit.

When purchasing secondary double glazing, it is imperative that the correct measurements are taken to ensure a seamless fit.

We have put together a series of measuring guides below which provide easy-to-digest instructions on the best way to take precise measurements for your secondary double glazing.

These instructions should help you take the basic measurements you need for new secondary double glazing. If you need us to fit the glazing for you, we will visit your property and take the exact measurements of your window, after you have accepted our quote.

Measuring Guides

There are 3 measuring guides below for a horizontal slider unit, vertical unit and the lift out and hinge unit.

What tools do I need?

For all 3 units, all you need is a measuring tape, and something to note your measurements on. Either your phone or a notepad.

How to Measure for a Secondary Double Glazed Horizontal Slider

1. Measure the width

Using a tape measure, measure from wall B to wall E (on the image above) and deduct 6mm for clearance.

2. Measure the height

Measure from wall A to wall E and deduct 6mm for clearance.

3. Measure each pane’s width

Measure from wall B to the centre of point C and deduct 5mm – if you have multiple horizontal units, be sure to measure these 3 areas for each, as some older windows could each have different sizes.

Watch the Video:

How to Measure for a Secondary Double Glazed Vertical Slider

1. Measure the width

Using a tape measure, measure from wall D to wall C and deduct 6mm for clearance.

2. Measure the height

Measure from wall A to wall C and deduct 6mm for clearance.

3. Measure the height of the top pane

Measure from wall A to the centre of point B and deduct 5mm – if you have multiple vertical units, be sure to measure these 3 areas for each, as some older windows could each have different sizes, for the full window and each separate pane.

Watch the Video: