How to measure?
How to Measure a uPVC Window
These guidelines are to help you measure for a new uPVC window and make an accurate measurement.
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Measure the opening outside on both the height and width.
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Always measure the exact brickwork opening and not the old window frame.
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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 window 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.
Measuring the Width
Measuring the Height
Please remember:
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Do not measure your existing door or frame but measure the brick opening.
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Measure in at least three different places and deduct 10mm from both the final height and width measurements - we do not make any fitting allowances on the sizes you provide.
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Measurements will need to include the frame, cill and any frame extenders/add on’s required.
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All dimensions to be supplied in metric and all styles viewed externally.
Transom Drop
The transom drop is measured from the top of the outer frame and down to the centre of the horizontal bar.
Mullion Width
The mullion is measured from the outer edge of frame to the centre of the vertical bar.
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 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 image. The height will need to be measured externally brick to brick including any existing cill.
Please note: We are unable to accept responsibility for incorrect measurements. If you are unsure we recommend that you consult a professional window fitter, joiner or builder to measure. You can always call us on and we will gladly help and advise.
How to measure a Composite and External UPVC doors
External uPVC door
Measuring your door is very simple.
Using your outside BRICKWORK-TO-BRICKWORK as your measuring points, simply follow the instructions detailed below to obtain the correct sizes.
Width
Take three measurements in millimetres (mm) horizontally as shown in diagram 1.
Measure the top, middle and bottom and deduct 10mm from the smallest of the three measurements to give you your width.
Diagram 1:
Height
Take three measurements in millimetres (mm) vertically as shown in diagram 2.
Measure the left, middle and right and deduct 10mm from the smallest of the three measurements to give
you your height.
Diagram 2:
You should now have your correct measurements for your door and now be able to proceed.
If you are unsure about measuring your door we advise that you ask the help of a friend who is competent with a measuring tape or you contact a local builder or joiner. If you would like us to talk you through this process then we’re happy to help and only a phone call away.
Internal UPVC Doors
Measuring your door is very simple.
Using your Door frame as your measuring points, simply follow the instructions detailed below to obtain the correct sizes.
Width. Take three measurements in millimetres (mm) horizontally as shown in diagram 1.
Measure the top, the middle and bottom and deduct 5 mm from each of the measurements.
If the three measurements are the same, then this is your width and you should choose the EDGE BANDED option.
If the three measurements are not the same, then take the greatest of the three, and this is your width, and you should choose the EDGE TRIM option which allows for planning your door to achieve a perfect fit.
Diagram 1:
Height
Take three measurements in millimetres (mm) vertically as shown in diagram 2.
Measure the left, middle and right and deduct 5mm from the greatest of the three measurements to give you your height.
Diagram 2:
You should now have your correct measurements for your door and now be able to proceed.
If you are unsure about measuring your door we advise that you ask the help of a friend who is competent with a measuring tape or you contact a local builder or joiner. If you would like us to talk you through this process then we’re happy to help and only a phone call away.