Measure once, order with confidence

How to Measure Plantation Shutters

Follow the instructions for your selected product and mount. The linked PDF covers inside-mount measuring, with sizes recorded in millimetres.

Inside mount: L / Z frames

  1. Step 1

    Choose your mount

    Inside mount sits within the reveal for a clean built-in look. Outside mount covers the opening and is more forgiving when the reveal is shallow or uneven. The three-point opening measurements below apply to inside mount. For outside mount, confirm the overall area your chosen frame needs to cover before entering your order dimensions. If the architrave, sill or mounting position is unclear, request a measurement review first.

  2. Step 2

    Measure width three times

    Measure the top, middle and bottom of the opening in millimetres. Use the smallest width for inside mount.

  3. Step 3

    Measure height three times

    For inside mount, record the height at the left, centre and right of the opening in millimetres. Keep all three measurements and use the smallest height when the product page asks for the inside-mount height.

  4. Step 4

    Check the diagonals

    Measure corner to corner both ways. If the numbers differ, note the opening as out of square and consider a Z frame or outside mount.

  5. Step 5

    Confirm clearance

    Check handles, tiles, architraves and reveal depth before ordering. Heights over 1600mm generally require a divider rail.

    Check awning, double-hung and sliding window clearance.

  6. Step 6

    Submit sizes for your chosen mount

    For inside mount, enter the smallest width and height you recorded without subtracting manufacturing clearance. For outside mount, use the confirmed coverage dimensions for your selected frame. Include your mount choice and window photos when requesting a review.

Open inside-mount measuring PDF Ask before ordering
Standard four-sided architrave

Outside mount: L Frame Out

This method applies to a standard opening with architraves on all four sides, where L Frame Out is suitable for your selected shutter and mounting position.

Three outside widths, measured to the architrave outer edges W1 at the top, W2 in the middle and W3 at the bottom. Each horizontal arrow starts at the outer left architrave edge and ends at the outer right edge. Outer left to outer right W1 W2 W3 Shaded border = architrave
Width: outer edge to outer edgeW1 top · W2 middle · W3 bottom
Three outside heights, measured to the architrave outer edges H1 at the left, H2 in the centre and H3 at the right. Each vertical arrow starts at the outer top architrave edge and ends at the outer bottom edge. The diagram assumes a bottom architrave, not a protruding sill. Outer top edge H1 H2 H3 Outer bottom edge
Height: outer top to outer bottomH1 left · H2 centre · H3 right

  1. Measure the outside width

    Measure from the outer left edge of the architrave to the outer right edge at the top, middle and bottom. Record all three widths in millimetres.

  2. Measure the outside height

    Measure from the outer top edge of the architrave to the outer bottom edge at the left, centre and right. Record all three heights in millimetres.

  3. Use the largest measurements

    For this standard L Frame Out setup, enter the largest of the three widths and the largest of the three heights. Inside-mount L and Z frames use the smallest measurements instead.

A protruding sill, missing bottom architrave or unclear mounting or coverage needs a measurement review before ordering. Do not use the standard diagram to choose a bottom measuring point for these openings.

Before choosing your shutter frame

Shutters for Awning, Double-Hung & Sliding Windows

A window type is a starting point, not a guarantee of fit. Check how your existing window operates and where the shutter frame, open panels and tilting louvres will sit.

Diagrams show typical window movement only, not shutter installation or required clearance. They are not to scale; hardware and opening styles vary.

Awning window movement, side view A top-hinged window opens outwards. Check the handle or winder on the room side separately; the diagram does not specify a shutter position. RoomOutside Check handle / winder access

Awning windows

Often hinged at the top and opening outwards. Check your actual hinges and opening mechanism.

  • Allow access to the handle, winder and lock throughout their movement.
  • Check projecting hardware against the proposed shutter frame and tilting louvres.
  • Plan how you will open the shutter panels to operate and clean the window.
Double-hung window movement, front view Upper and lower window sashes slide vertically. Check access to the meeting-rail lock and any inward movement used for cleaning. Check sash and lock access

Double-hung windows

Upper and lower sashes move vertically. Some designs also tilt inwards for cleaning.

  • Check that you can reach the meeting-rail lock and move both sashes.
  • If your sashes tilt inwards, check that movement with the shutter panels open.
  • Keep the window hardware and cleaning access clear of the frame and louvres.
Sliding window movement, front view A window sash moves horizontally. Check projecting handles, locks and access to the window track before positioning shutters. Check handle and track access

Sliding windows

One or more sashes move sideways. Check the sliding direction and the position of handles and locks.

  • Check how far handles and locks project into the proposed shutter space.
  • Keep the window sliding path and track accessible for operation and cleaning.
  • Allow room to swing the shutter panels open without hitting nearby walls or furniture.

Unsure about the clearance?

Send a full-window photo, close-ups of the handle and lock, the reveal depth and opening dimensions in millimetres. Include photos with the window open and closed where safe. The required clearance depends on the selected frame, louvres, hardware and panel layout; there is no single allowance for every window.

Do not drill or subtract an assumed clearance to solve a clash. Remote advice is based on your photos and measurements and does not replace on-site checks of fit or suitable fixing surfaces.

Request Photo & Measurement Review
Next step

Ready to configure EasyKit?

If your measurements and install path are clear, start with EasyKit DIY. Want a second set of eyes first? Send your dimensions and photos for review, or compare EasyKit DIY with EasyShutter Pre-Assembled before ordering.

Start EasyKit Quote Request Measurement Review Compare EasyKit vs Pre-Assembled