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Guides for measuring your window opening when replacing with a PVC window

(Please select the guide appropriate for you)

Guide WA: Replacing an existing window. (i.e. window screwed & plastered into place)

Width (measured in millimetres)
The width should be measured at three locations; top, middle and bottom, on the inside & the outside. The largest of these measurements plus 14mm (7mm plaster cover each side) should be taken as the width.

Height (measured in millimetres)
The height should be measured at three locations; left, middle and right, on the outside only due to the timber window cill on the inside. The largest of these measurements plus 7mm (7mm plaster cover at the top) is taken as the height.

However do not include the height of the drip attached to the bottom of the window. The drip is a small piece of plastic 10-20 high that runs the width of the window on the bottom. Its function is to divert water down to the cill instead of horizontally into the house. You will see a slight joint line, measure from there up.

Guide WB: For new houses or extensions where the blocks are not plastered yet. (i.e. No plastered reveals)

Width (measured in millimetres)
The width should be measured at three locations; top, middle and bottom. The smallest of these measurements minus 5mm should be taken as the width.

Height (measured in millimetres)
The concrete cill will need to be in place first. The height should be measured at three locations; left, middle and right. The smallest of these measurements minus 5mm is taken as the height.