Measuring Windows

• All measurements to be taken from external openings
• When measuring always measure in millimetres
• Measure the width of the opening in 3 places:
  1. Bottom of opening left to right
  2. Middle of opening left to right
  3. Top of opening left to right
• Measure the height of the opening in 3 places:
  1. Left of opening top to bottom
  2. Middle of opening top to bottom
  3. Right of opening top to bottom

Take the smallest measurement for the width and the smallest for the height and take off 10mm off each of them e.g.

Window opening = 1800mm width x 1000mm height

Deduct 10mm from the width and height = 1790mm width x 990mm height

The above dimensions will be the manufacturing/order sizes that you will need to input when ordering windows and doors from our website.

You deduct 10mm from the width and height to allow for tolerance when fitting.