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PLANTATION SHUTTERS HELP CENTRE

Browse Shutter Guide

How to Measure Your Window Recess

Before measuring the final shutter size, check the usable depth of the recess and whether anything occupies that space.

Check your recess depth before measuring

As a simple guide, allow approximately 70mm of clear recess depth for an inside-mounted plantation shutter. Check the shallowest usable depth and measure to the first obstruction that could interfere with the shutter, such as a handle, winder, lock, key, flyscreen or other window fitting.

If you have around 70mm or more of clear space, you can generally continue with the inside-mount measuring instructions.

Have less than 70mm, or an obstruction in the recess? An inside mount may still be possible depending on the frame choice and where the obstruction sits. See our Managing Window Obstructions guide for the detailed clearance requirements.

Measuring for an Inside Mount

Once you have confirmed that an inside mount is suitable, take the final shutter width and drop measurements. Windows are rarely perfectly square, so measure in multiple positions rather than relying on one width and one height.

You will need a metal tape measure, something to record each measurement and a pen or pencil. Do not make your own manufacturing deductions.

Find the front reference point

Measure from the front face of the recess inward toward the window. Use the same reference plane around the whole opening.

Recess depth diagram

Examples of obstructions

Security boxes, locks, winders, and handles.

Measure to the first obstruction

Stop at the first handle, lock, flyscreen, mullion or moving window part that could conflict with the shutter. This is the usable depth.

Measuring to obstruction

Check several locations

Measure near the top, centre and bottom on both sides. Use the shallowest clear measurement when checking frame suitability.

Operate the window

Open the sash and use the handle or winder. Make sure the moving parts do not enter the space you are counting as clear depth.

Measuring Inside Mount for a Square-Set Window

  • Measure the drop in three places: left, centre and right.
  • Measure the width in three places: top, middle and bottom.
  • Use the smallest width and smallest drop.

Measuring Inside Mount for a Window with an Architrave

The architrave does not become the measuring point for an inside mount. Measure the opening inside the recess.

  • Measure the drop in three places.
  • Measure the width in three places.
  • Use the smallest width and smallest drop.

Measuring Inside Mount for a Square-Set Window with a Sill

  • Measure the drop in three places from the top surface of the sill to the inside top of the recess.
  • Measure the width in three places inside the recess.
  • Use the smallest width and smallest drop.

Measuring Inside Mount for a Window with a Sill and Architrave

  • Measure the drop in three places from the top of the sill to the inside top of the recess.
  • Measure the width in three places inside the recess.
  • Use the smallest width and smallest drop.

Before ordering: if your recess is less than approximately 70mm deep, or contains handles, winders, locks, flyscreens or other obstructions, check our Managing Window Obstructions guide before finalising your inside-mount measurements.

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