Blinds measuring guide

Follow this method to measure your windows for all our blinds – rollers, venetians, verticals and honeycombs blinds.

You will need


A metal tape measure


Our measuring sheet


Pencil or pen

Things to consider

Opt for an inside window frame fit for a sleek appearance, provided your window recess is sufficiently deep and allows for gaps that allow the blind to move freely. Keep in mind that this approach may not be suitable for smaller windows as it can block out light.

Alternatively, consider mounting your blind on the outside of the window frame, especially if the window protrudes, or on the wall just above the frame to minimize light gaps. This method is highly effective for light blocking and insulation, particularly with back roll roller blinds. Both inside and outside fitting blinds may still have small gaps on the sides and occasionally at the top and bottom of the window. For minimal gaps, consider using Honeycomb blinds.

Tip: Ensure there are no obstructions where the blind will hang to ensure smooth opening and closing.

Measuring for controls

While standing at your window, determine the most convenient side for operating the blind and assess the ideal cord length. Consider factors like the window’s height; for higher windows, a longer cord may be more accessible, whereas full-length windows may benefit from a shorter cord that’s out of children’s reach. As a general guideline, aim for a cord length that’s around 75% of your blind’s drop.

Different types of blinds have varying mechanisms:

  • Venetian blinds can be operated with either a cord for raising and lowering and a wand for tilting the slats, or a set of cords that perform both functions.
  • Roller blinds are typically controlled using a chain for raising and lowering.
  • Vertical blinds can be operated with either a cord and wand or a cord and chain.
  • Honeycomb blinds offer multiple control options, including a cord, a chain, or a cordless system. Note that cordless is only suitable for windows where you can easily reach the blind’s bottom rail in both the raised and lowered positions.

Illustrated steps

Inside fit

How to measure

Measuring your window correctly is essential. Focus on the window size, and we will account for the necessary allowances related to brackets and chain/cord mechanisms.


This measurement ensures your blind fits snugly within the window recess. Measure from the inside of the frame’s front to the first obstruction, such as glass, latch, handle, or mullion. Below are recommended clearances for various blind types:

  • Roller blind: 70mm
  • Dual roller blind: 100mm
  • Honeycomb blind: 40mm
  • Aluminium venetian blind: 40mm
  • Wood or PVC venetian blind: 80mm (including fascia)
  • Vertical blinds: 100mm

Width (a)

To determine the width accurately, follow these steps:

  • Take three horizontal measurements across the window: one at the top, one at the bottom, and one in the middle.
  • Measure from inside the frame, spanning from frame to frame, not just the individual glass panes.
  • Record the smallest measurement among the three as your width.

Drop (b)

For precise drop measurements, proceed as follows:

  • Take three vertical measurements down the window: one on the left side, one on the right side, and one in the middle.
  • Measure from inside the frame, spanning from frame to frame, rather than focusing solely on the glass panes.
  • Record the smallest measurement among the three as your drop.

Outside fit

Drop (a)

For venetians, honeycombs, and back-rolled roller blinds, which are typically installed at the top of your window:

  • Attach the blind to the architrave or reveal of the window frame.
  • Measure from the outer edge of the frame on one side to the outer edge on the other.
  • Record this measurement as your width.

For vertical blinds and front-rolled roller blinds, which are installed above your window for better coverage when down:

  • Fix the blinds to the wall above your window.
  • Measure the width of your window from the outside of the frame on one side to the outside on the other.
  • Add 50mm to each side for roller blinds and 100mm to each side for vertical blinds.
  • Record the adjusted measurement as your width.

Drop (b)

To determine the drop accurately:

  • Take three vertical measurements down the left and right sides of the window, as well as in the middle.
  • Measure from the top of the outer edge of the window frame down to the sill, the bottom of the window frame, or lower if desired and unobstructed.
  • Record the smallest measurement among the three as your drop.

Tip: If you’re mounting the blind above a window frame that isn’t flush with the wall, you may need to use shims or pack out the bracket to ensure the blind clears the window reveal when installed.