Plantation shutters are one of the smartest upgrades you can make to a home. They provide excellent light control, improve privacy, add insulation, and increase the value of a property in a way few window coverings can match.
But before any of that happens, there is one step that determines whether your shutters fit perfectly or end up slightly off — measuring.
If you’re wondering how to measure windows for plantation shutters, this step-by-step guide will walk you through the process. We’ll cover the tools you need, explain mounting styles, and show you how to take accurate measurements for a professional-looking result.
Even if you plan to have a professional complete the final measure, understanding the process helps you make informed decisions and feel confident throughout your project.
Why Accurate Measuring Matters
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TogglePlantation shutters are custom-made to suit your exact window dimensions.
Unlike standard blinds that can sometimes be trimmed or adjusted, shutters are manufactured to precise measurements. Even a few millimetres can affect the fit, operation, appearance, and light control.
Accurate measurements help ensure:
A clean, flush finish
Smooth opening and closing of panels
Minimal light gaps
Proper alignment within the window opening
A professional final appearance
This is why measuring is one of the most important stages of any plantation shutter installation.
Tools You’ll Need
Before getting started, gather the following:
Steel measuring tape (avoid cloth or flexible tapes as they can stretch and create inaccurate readings)
Pencil and notepad, or your phone for recording measurements
Step ladder for tall windows
Spirit level (optional but useful for checking if windows are square)
A steel tape measure is essential. Always record measurements in millimetres, as this is the standard used by shutter manufacturers and helps avoid rounding errors.
Step 1: Choose Your Mounting Style
Before measuring, decide how your plantation shutters will be installed.
The mounting style affects every measurement that follows.
Inside Mount (Recess Fit)
An inside mount sits within the window recess, creating a clean built-in appearance.
This option:
Provides a neat, flush finish
Highlights window depth and trims
Works best when there is enough recess depth available
Inside mounts remain one of the most popular choices in Sydney homes.
Outside Mount (Face Fit)
An outside mount attaches to the wall or outer frame around the window.
This option is ideal when:
Window recesses are too shallow
You want to make windows appear larger
Maximum glass coverage is preferred
Obstructions prevent an inside fit
Decide on the mounting style before taking any measurements.
Step 2: Measure the Width
For Inside Mounts
Measure the window opening width in three locations:
Top
Middle
Bottom
Older Sydney homes, particularly heritage properties, often have windows that are not perfectly square.
Record all three measurements and use the smallest measurement. This ensures the shutters fit into the narrowest section of the recess.
For Outside Mounts
Measure the total area you want the shutters to cover.
Most homeowners allow an overlap of approximately 40–50 mm on each side of the window opening.
This overlap helps:
Reduce light leakage
Improve privacy
Create a stronger framed appearance
Step 3: Measure the Height
The same principle applies when measuring height.
For Inside Mounts
Take three measurements:
Left side
Centre
Right side
Again, record each measurement and use the smallest figure.
For Outside Mounts
Measure from the intended top position of the shutter frame down to:
The window sill, or
The desired finishing point if extending below the sill
Double-check long vertical measurements carefully, as tape sag can affect accuracy.
Step 4: Check Window Depth (Inside Mounts Only)
If you’re choosing an inside mount, recess depth is critical.
The recess must accommodate:
The shutter frame
Louvre movement
Any hardware projections
Measure from the front edge of the recess back to the glass or any protruding features.
Check for:
Window handles
Locks and latches
Winders
Tiled sills
If the recess is too shallow, an outside mount or alternate frame style may be the better solution.
Step 5: Identify Obstructions and Features
Every home is different, and Sydney properties often include unique architectural details.
Look for anything that may affect installation, including:
Window handles or locks extending into the recess
Deep tiled sills
Decorative architraves
Nearby power points and switches
Cornices above tall windows
Angled ceilings
Recording these details early helps avoid installation surprises later.
Step 6: Record Measurements Clearly
Once everything is measured, organise the information carefully.
For each window record:
Width × Height (industry standard format)
Also note:
Mounting type (inside or outside)
Room name
Window position
Obstructions or special notes
For example:
Master Bedroom – North Window
Inside Mount
1180 mm × 1520 mm
Handle on right side
Avoid assuming identical windows are the same size. Measure every window individually, even if they appear identical.
Common Measuring Mistakes to Avoid
Even careful homeowners make mistakes during measuring.
Here are the most common ones:
Measuring Only Once
Always take three measurements for width and height.
Using a Flexible Tape
Cloth tapes stretch and reduce accuracy.
Use a steel tape measure only.
Forgetting Recess Depth
Depth is essential for inside-mounted shutters.
Rounding Measurements
Record exact millimetre readings rather than rounding up.
Ignoring Obstructions
Handles, locks, sills, and trims can all affect installation.
Avoiding these mistakes puts you in a much stronger position whether measuring yourself or preparing for a professional quote.
When to Bring in a Professional
Learning how to measure windows for plantation shutters is helpful for planning and budgeting, but plantation shutters are a long-term investment and final measurements are best handled professionally.
An expert measure ensures:
Exact dimensions
Correct mounting recommendations
Obstruction checks
Accurate manufacturing measurements
At OZ Plantation Shutters, we provide free measure and quote services across Sydney. Our experienced team checks every detail to ensure your shutters are manufactured to fit perfectly and operate smoothly.
That means less stress and a flawless finish.
Final Thoughts
Understanding how to measure windows for plantation shutters gives you a strong start to your project.
By learning mounting styles, checking recess depths, accounting for obstructions, and recording measurements correctly, you’ll be better prepared for the installation process and more confident in your decisions.
Measure carefully, record everything clearly, and when it’s time for the final step, bring in experienced professionals to ensure the perfect fit.
If you’re ready to upgrade your Sydney home with custom plantation shutters, OZ Plantation Shutters is here to help from the initial measure through to expert installation and a beautifully finished result.
