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Complete Guide: How to Measure a Venetian Blind

par Ombre Intérieur Jul 04, 2026
Sommaire

    The Venetian blind, also known as the adjustable slat blind, is an elegant and practical window covering solution for every room in the house. But for a perfect finish, precise measurement is essential. Whether you choose an inside mount (recess fit) or an outside mount (above the window), every centimetre counts. This comprehensive guide covers everything from choosing the model to maintenance, including common mistakes to avoid.

    Key Takeaways:
    • Always measure at three points (top, middle, bottom) for both width and height.
    • For an inside mount, subtract 1 cm from the width to ensure clearance for operation.
    • For an outside mount, add at least 10 cm on each side and 15 cm to the height.
    • Use a metal tape measure for better accuracy.
    • Note dimensions in cm and double-check before ordering.

    Different Types of Venetian Blinds

    Aluminium Venetian Blinds

    Aluminium is the most common material. Lightweight and moisture-resistant, it is perfect for bathrooms and kitchens. Its slats range from 16 to 25 mm, offering a good balance between light control and privacy.

    Wooden Venetian Blinds

    Wood adds a warm, natural touch. Ideal for living rooms and bedrooms, but it is sensitive to moisture. Slats are usually wider (25 or 50 mm) and require careful maintenance.

    Bamboo Venetian Blinds

    Bamboo is an eco-friendly alternative to wood. It offers an exotic look and good durability, but it is less common and may warp over time.

    Custom vs. Standard Venetian Blinds

    Standard blinds are budget-friendly but limited in size. For non-standard windows or a perfect fit, a custom Venetian blind is recommended.

    How to Choose Your Venetian Blind

    Selection Criteria

    • Mount type: Inside or outside? Inside mount requires a window recess, while outside mount suits any window.
    • Slat width: 25 mm for small windows, 50 mm for large patio doors.
    • Colour: White, beige, grey, or wood tones to match your decor.
    • Mechanism: Standard cord, bead chain, or motorised (handy for high windows).
    • Light control: Adjustable slats for light modulation or fixed slats for total blackout.

    Comparison Table of Venetian Blind Types

    Type Material Advantages Disadvantages Recommended Use
    Aluminium Aluminium Lightweight, moisture-resistant, easy to clean Less insulating than wood Kitchen, bathroom, humid rooms
    Wood Solid wood or MDF Warm aesthetic, good insulation Requires maintenance, sensitive to moisture Living room, bedroom, dry rooms
    Bamboo Bamboo Eco-friendly, natural look Less durable, may warp Exotic decor

    How to Measure a Venetian Blind

    Tools Needed

    • A metal tape measure (avoid cloth tape as it can stretch)
    • A pencil and paper
    • A spirit level (optional)

    Measuring for an Inside Mount (Recess Fit)

    This mount is ideal if your window has a recess of at least 5 cm. Measure the width at the top, middle, and bottom of the window, then take the smallest measurement. Subtract 1 cm for clearance. Measure the height at the left, centre, and right, and take the largest measurement. No deduction is needed for height, but ensure the blind does not touch the floor or sill.

    Measuring for an Outside Mount (Above the Window)

    This mount conceals non-standard windows or makes a window appear larger. For width, add 10 to 20 cm on each side of the window frame. For height, add 15 to 20 cm above the window and let the blind hang 5 to 10 cm below the sill. Measure the exact area to be covered.

    Measuring for a Ceiling Mount

    If mounting to the ceiling, measure the total width of the area to cover (usually window width plus 20 cm each side). The height is measured from the ceiling to the desired point (typically to the floor or sill).

    Common Measuring Mistakes to Avoid

    • Not measuring at multiple points: Windows are rarely perfectly square. Always measure at three points.
    • Forgetting clearance: For inside mount, subtract 1 cm in width so the blind slides smoothly without rubbing.
    • Mixing up dimensions: Always note width x height in that order.
    • Using a cloth tape measure: It can stretch and give inaccurate readings.
    • Ignoring obstructions: Window handles, power outlets, or pipes can interfere with operation.

    Care and Usage Tips

    Cleaning Venetian Blinds

    • Dust regularly with a feather duster or microfiber cloth.
    • For deep cleaning, use a soft, slightly damp cloth with mild soap.
    • Avoid abrasive products that scratch the slats.
    • For wooden blinds, use a specific wood cleaner and avoid water.

    Tips to Extend Lifespan

    • Operate the blind gently to avoid bending slats.
    • Avoid pulling the cord too hard.
    • If the cord gets tangled, untie it carefully.
    • For motorised blinds, check batteries or power connection.

    Frequently Asked Questions About Measuring Venetian Blinds

    Should I measure width or height first?

    Width is usually measured first as it determines the blind's width. Height comes next.

    How to measure for a roof window?

    For a roof window, measure the width between the two walls or the frame, and the height from the top of the window to the bottom. An outside mount is often simpler.

    Can I install a Venetian blind without drilling?

    Yes, adhesive or clamp brackets are available, but they are less sturdy. For a standard Venetian blind, screw fixing is recommended.

    Conclusion

    Measuring a Venetian blind is not complicated if you follow the right steps. Take your time to measure at multiple points, choose the mount type that suits your window, and avoid common mistakes. For a perfect result, consider a custom Venetian blind. Explore our collection of quality Venetian blinds, available in a wide range of colours and sizes, to dress your windows with style.

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    Frequently Asked Questions

    How do I measure the width of a Venetian blind?
    Measure the width at three points: top, middle, and bottom of the window. For an inside mount, take the smallest measurement and subtract 1 cm for clearance. For an outside mount, add 10 to 20 cm on each side of the frame.
    What is the difference between inside and outside mount for a Venetian blind?
    An inside mount fits within the window recess, requiring at least 5 cm depth. An outside mount is installed above the window, hiding flaws and making the window appear larger.
    Do I need to allow clearance for an inside mount Venetian blind?
    Yes, subtract 1 cm from the width to allow the blind to slide freely without rubbing against the walls. No deduction is needed for height.
    How do I measure a Venetian blind for a roof window?
    Measure the width between the two walls or the window frame. For height, measure from the top of the window to the bottom. An outside mount is often easier for roof windows.

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