Before you begin, ensure there is a 6mm clearance all around the outside of your window beading to allow enough room for the Perfect Fit framework (left).

Also check that the seals of your window frame do not protrude over the glass more than 6mm and that they are compressible. You can then take a bead to bead measurement (right & below left).

If your seals are not compressible (solid) and do not protrude over the glass more than 6mm you can then take a seal to seal measurement (right & below left).

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Step 1 - Measure glass size

Measure the width and the drop of your window size accurately with a digital measuring tape (P9480). We recommend that you measure in both corners and the middle of your window and use the smallest size taken (left & above right).

Step 2 - Measure window depth

Measure the depth of the window (right) using the depth gauge (P9481). This gives you the measurement from the face of the window frame to the glass (this is normally 20mm/24mm) and will determine the size of the window fixing brackets you will use.

Read more about how to assemble your Perfect Fit Blind