How to Measure for New Windows?
Contents

How do you measure for new UPVC windows?

Measure your window from the outside of the property.

Measure the brickwork opening in 3 places for both width and height.

Of the 3 measurements use the smallest and deduct approximately 10mm, that’s your order size.

The height measurements must be from underneath of any existing removable cill.

How do you measure the rough opening of a window?

Measure the width across the bottom of your window opening between the inside faces of the framing on each side. Measure the height of the opening between the bottom of the header and the top of the sill on the left, right, and center of the opening. Measure the thickness of the flashing needed.

Maya Lin-Takahashi

Maya Lin-Takahashi

Consumer Tech & Gadget Reviewer

Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.

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