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Whether you are ordering a patio door for a new-build or renovation, taking correct measurements is the first important step to ensure an accurate final installation.

Thanks to this simple guide, relevant to our lift and slide, tilt and slide, smart slide, and bifold doors, noting dimensions is kept clear – below you will find information for measuring for patio door width and height as well as downloadable instruction pdfs and our contact details for slightly more complex cases or questions.

Materials

  • Pen and paper
  • Blueprint
  • Tape measure

Preparatory information

Before starting to measure, it is important to note that dimensions for patio doors should be taken from the inside. Upon measuring, a sketch of the wall opening should be drawn showing the inside view. The opening direction of the new patio door should then be added along with the required dimensions in mm.

Measurements should be taken regardless of whether the ordered door will be installed in a new-build or will function as a replacement in a renovation.

For renovations, even for replacements of current doors with blueprints, measurements should be taken before the old door has been removed.

Measure for a patio door in simple steps

  • For patio doors that will be ordered without a roller shutter or frame extension

1. Measure the width

The first step to measure a patio door is to take accurate dimensions of the wall opening’s width. These measurements can then be typed into our user-friendly configurator’s dimension ranges upon order.

Key steps

  • Measure the upper width
  • Measure the lower width
  • Align the values
  • Make allowances for seals

  1. Measure the width of the opening at the bottom with a tape measure and note the value on a sketch
  2. Measure the width of the opening at the top and note this down in the same way
  3. If these two dimensions vary, take the smaller value as the official measurement
  4. As the door frame will later have sealing, an approximate 20 mm (1 inch) allowance should be deducted for the final opening width measurement

Example: 1230 mm is taken as the upper width with 1220 mm noted at the bottom. 1220 mm is therefore used as the official width measurement. 20 mm allowance is deducted to give 1200 mm

 

2. Measure the height

The height required for your new patio door should now be determined. The process is similar to measuring the width and will also help to ensure an accurate fit.

Key steps

  • Measure the height to the left
  • Measure the height to the right
  • Align the values
  • Make allowances for seals

  1. The door height should typically be measured from the finished floor to the top of the wall opening
  2. Measure the height of the opening at its left side with a tape measure and note the value on a sketch
  3. Measure the height of the opening on the right and note this down in the same way
  4. If these two dimensions vary, take the smaller value as the official measurement
  5. Now deduct 10 mm sealing allowance for the final opening height measurement

Ready to measure? Download these instructions today

By clicking below you will find these measurement instructions as a downloadable pdf. Although the measuring process is the same for each of our patio door types, the pdfs provide additional clarity in terms of product-specific images.

Ordering a patio door with roller shutters or a frame extension? Or need further support?

If you have questions about measuring for patio doors, please contact our in-house experts on +49 711 860 60 200, via email at info@windows24.com, or by arranging an appointment.

Our team can also provide professional, tailored advice on how to measure for patio doors where customers wish for the threshold to be lower or for doors with roller shutters and frame extensions. In these cases the final width and height of the door may need to allow for specific boxes, rails, or parts that should fit into the wall opening or floor.

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