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How to measure a new double glazed external composite front door

These guidelines are to help you measure for a new front door and frame, if you are unsure we recommend contacting a local door installer to carry out a site survey.

Measure the both the height and width from the OUTSIDE. Always measure the exact brickwork opening and not the old door frame or door currently in place.

Measure brick to brick in at least three different places and deduct 10mm from both the final height and width measurements to allow for a 5mm fitting allowance around the new door frame. This will enable the new frame to sit plumb and square once in the aperture. Packers and silicone will then be required to secure the frame into place and fill any gaps.

Please remember:

We are unable to accept responsibility for incorrect measurements. If you are unsure we recommend that you contact a professional door fitter, joiner or builder to carry out a site survey.

How to measure a double glazed door and frame

Width

The width should be measured brick to brick at three points - top, middle and bottom of the opening. The smallest of these measurements is taken as the width. Always deduct 10mm from the final width.

how to measure the width of a front door and frame
Height

The height should be measured brick to brick at three points - left, middle and right of the opening. The smallest of these measurements is taken as the height. Always deduct 10mm from the final height.

how to measure the height of a front door and frame

How to measure a double glazed door with side panels or a top light

Side Panels

The width should be measured brick to brick at three points - top, middle and bottom of the opening. The smallest of these measurements is taken as the width. Always deduct 10mm from the final width.

The side panel width should be measured from the centre point of the frame between the door and the side panel, to the outer edge of the side panel frame.

diagram showing how to measure the width of a front door with side panels
Top Lights

The height should be measured brick to brick at three points - left, middle and right of the opening. The smallest of these measurements is taken as the height. Always deduct 10mm from the final height.

The top light depth should be measured from the centre point of the frame between the door and the top light to the top of the door frame. This will give you the transom drop for the top light.

diagram showing how to measure the height of a front door and top light

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