Before you order and install your new windows, you need to determine the correct window size. This is made simple with our handy step-by-step window measuring guide. For further information about measuring window accessories and add-ons, please refer to our window measurement guide.
What do you need?
- Pen
- Paper
- Measuring tape
- Blueprint, if necessary
Please note: with the person measuring remaining inside, both the inside and outside of the window should be measured with the dimensions noted in millimetres. Any additional window fittings, such as frame extensions or top mounted roller shutters, should also be included when measuring.
2. Measure the window's width
Please measure the full width of your wall’s opening, once at the top and once at the bottom. If these measurements differ, please note down the smaller value. A slight installation allowance for the new frame should then be deducted. Please see the guide on installation allowances below.
Example: white window with a width of 1000 mm ► 1000 mm - (2 x 10 mm installation allowance) = 980 mm
3. Measure the window's height
Please measure the full height of your wall’s opening, once on the left-hand side and once on the right. If these measurements differ, please note down the smaller value. A slight installation allowance for the new frame should then be deducted. Please see the guide on installation allowances below.
Example: white window with a height of 900 mm
► 900 mm - (2 x 10 mm installation allowance) = 880 mm
Installation allowance guide
Installation allowances are a necessary part of measuring windows and ensure that new frames sit firmly in their openings. The amount of allowance depends on the width and colour of the window’s profile.
Please note: the specifications are per side.
|
Approximate window size |
Installation allowance for a white window |
Installation allowance for a coloured window |
|---|---|---|
|
1000 mm |
10 mm |
15 mm |
|
1000 mm |
15 mm |
20 mm |
|
3000 mm |
20 mm |
25 mm |
