Measuring your window seat correctly is the most important step when ordering custom window seat cushions. Accurate dimensions ensure a seamless fit, long-lasting comfort and a refined, built-in finish.
In this guide, we explain exactly how to measure a window seat cushion in millimetres (mm), whether you're ordering a made-to-measure bench cushion, bay window cushion or built-in seating pad.
What You’ll Need
• A steel tape measure
• A notepad or phone to record measurements
• A straight edge (for checking squareness if needed)
All dimensions should be entered in millimetres (mm) for accuracy.
Step 1: Measure the Length (A)
Length (A)
Measure the full left-to-right length of the seat.
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Measure from one wall or edge to the other.
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If your window seat fits between two walls, measure wall to wall.
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If it’s open on one side, measure the full visible seat width.
For bay windows or L-shaped seating, measure each section separately.
Tip: Measure twice to confirm accuracy.
Step 2: Measure the Depth (B)
Depth (B)
Measure from the front edge to the back edge of the seat.
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Measure from the very front of the seat base to the back wall or backrest.
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Ensure your tape measure runs straight and level.
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Do not follow the curve of a bay window — measure straight across.
Depth determines how comfortable your bench seat cushion will feel, so accuracy is important.
Step 3: Choose the Height (C)
Height (C)
Measure the finished cushion thickness.
This is not measured from your seat — this is the thickness you would like your cushion to be.
Common thickness options for custom window seat cushions:
• 5=90mm – Recommended Seating Height
• 75mm – Comfortable everyday seating
• 100mm+ – Deep seating or high-use areas
If your window seat is part of a dining nook or kitchen banquette, 75–100mm is typically recommended.
Measuring Bay Window Cushions
For bay windows:
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Measure each straight section individually.
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Record all lengths clearly.
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If angles are involved, note them or provide a simple sketch.
Custom-made bay window cushions require precise dimensions to ensure clean joins and a seamless finish.
If you're unsure, professional measuring services are available throughout Auckland.
Measuring Built-In Bench Seating
For built-in bench cushions:
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Confirm the base is square.
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Measure internal wall-to-wall distances.
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Check if the back wall has skirting or trims that affect depth.
Even small variations can impact the fit of a made-to-measure bench cushion.
Common Measuring Mistakes to Avoid
• Measuring in centimetres instead of millimetres
• Not accounting for skirting boards
• Forgetting to measure both ends of a long seat
• Guessing cushion thickness
• Not double-checking dimensions
When ordering custom window seat cushions in NZ, accuracy ensures a perfect result.
What Happens Next?
Once you have your dimensions:
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Enter your Length (A), Depth (B) and Height (C) in millimetres.
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Select your cushion fill (firm foam or ergofill).
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Choose your fabric from our fabric range.
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Order up to 5 complimentary fabric samples to view at home before confirming.
If lead time is important, contact us to confirm fabric availability.
Ready to Order Your Custom Window Seat Cushion?
Correct measurements are the foundation of a beautifully tailored result. Whether you’re ordering a window seat cushion, bench seat cushion, scatter cushions or outdoor squabs, precision matters.
If you’re based in Auckland, our in-home measuring service provides complete peace of mind.