Measuring Guide.

How to measure a double glazed door and window

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These guidelines are to help you measure for a new double glazed door and/or window and make an accurate measurement.

Measure the opening outside on both the height and width. Always measure the exact brickwork opening and not the old frame or door.

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

  • How to measure a double glazed door
  • How to measure a double glazed door with a side panel or top light
  • How to measure a double glazed window
  • How to measure a double glazed square bay window
  • How to measure a double glazed bow window

Measure up and choose your UPVC doors from the comfort of your home – it’s never been so easy!

You will require the following information in order to obtain a no obligation quotation:

The height
and width measurements of your door space measured from brickwork to brickwork from the outside (see below).


We strongly recommend that you double check your measurements prior to requesting a quote, as errors in measurements cannot be accepted once your door has been placed on our production list.

How to Measure

Let us show you how easy it is to measure your doors. These are just guidelines to help you make an accurate measurement. Just follow the instructions, you will require a pen & paper to note the measurements taken.

Width

The width should be measured at three points – top, middle and bottom of the opening. The smallest of these measurements is taken as the width.

Height

The height should be measured at three points – left, middle and right of the opening. The smallest of these measurements is taken as the height.

How to measure a double glazed window

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.

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 a double glazed square bay window

Square Bay windows consist of three sides and two 90 degree corner posts. The width (back span) will need to be measured internally from the existing frame edge to edge. Measure each side window internally and ensure they are the same from one edge of the frame to the other. The height will need to be measured externally brick to brick including any existing cill.

We will add 140mm to the external size for the two 90 degree corner posts which are 70mm square.

For example, if the internal width is 1800mm the external width including two 70mm corner posts will be 1940mm, see image below.

How to measure a double glazed bow window

Bow windows are slightly more complicated than bays, consisting of two or more sides and shallower angles. The width (back span) will need to be measured internally from the existing frame edge to edge. Measure each individual window facet internally from one edge of the frame to the other. The projection of the bow will need to be measured internally from the inside back span of the window to the inside point of the window frame as below. The height will need to be measured externally brick to brick including any existing cill.

Please remember:

  • Do not measure your existing door or frame but measure the brick opening.
  • Measure in at least three different places and we recommend deducting 10mm from both the final height and width measurements – we do not make any fitting allowances on the sizes you provide.
  • Measurements will need to include the frame, cill and any frame extenders/add on’s required.
  • All dimensions to be supplied in Metric and all designs viewed externally.

Please note: We are unable to accept responsibility for incorrect measurements. If you are unsure we recommend that you consult a professional fitter, joiner or builder to measure up. You can always call us on 0800 328 2228 and we will gladly help and advise.

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Arrange a Quote.

To organise a free quotation, please call free on 0800 328 2228, or complete the following form, one of our consultants will be pleased to offer practical and free advice.

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