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How to Measure

The process of measuring windows for the installation of blinds is, in general, the same for most of the different blind products. Essentially, the main issue with blind installation is whether the blind is fitted onto the frame and architrave – known as a "FACE FIT" or inside the window frame next to the glass – known as a "RECESS FIT". The choice of "FIT" depends on:

  • the type of blind to be used
  • the look to be achieved
  • whether there are obstacles which may affect the installation
  • economy – a Recess Fit is a smaller blind and therefore cheaper than a Face Fit blind.
  • The ability to fit on the face where there may be no architrave (for a Face Fit) or the recess itself is too small to accommodate a blind (for a Recess Fit)


Face Fit BlindThe width of the window (or door) is measured at the top from the edge of the architrave on one side of the window to the edge of the architrave on the other side of the window.

The drop (depth) of the window is measured from the top of the architrave to the bottom of the window, at the sill or at the floor depending on the look you require.

These measurements remain the same for most products.


Recess Fit BlindThe width of the window is measured from the inside of the frame (on L/H side) to the inside of the frame (on R/H side). It is sensible to take this measurement at three points – top, middle and bottom to ensure that the frame does not bow or warp. Use the smallest measurement if there is a difference.

The drop (depth) of the window is measured from the inside of the frame at the top to the inside of the frame at the bottom of the window. Again, take three measurements – left, middle and right to check for any distortions in the frame. Use the smallest measurement if there is a difference.

Be aware with a Recess Fit that there will usually be a light gap at each side as any blind cannot fit right up to the edge of the frame.


Check your windows for any obstacles that may impede the smooth operation of a blind.

These can include knobs, window winders, handles (door or otherwise), window mullions or intermediate frames. Most of these have the effect of ensuring that the blind is a Face Fit rather than a Recess Fit. Additionally if you want multiple blinds the installation may be determined by the position of intermediate vertical frame sections as well as other issues, such as trying to create a particular look from the inside or outside of the building.

Remember also that windows are not always square, so check your measurements thoroughly.

Do not make any deductions as we will calculate those to ensure that the best outcome and look of the blind is achieved.


Sliding Door BlindsThese types of windows are common in Family room areas in many houses. The windows are large and require thoughtful choice of blinds to ensure ideal operation and function of the blinds and the sliding doors.

The sliding door itself usually discourages Recess Fit as the blinds will be affected or damaged by the operation of the door. Additionally the door handle interferes with Recess Fit blinds.

If multiple blinds are desired, there are most commonly three blinds per window, one to fit across the sliding door and two others to fill in the rest of the space. Either Roller blinds or Timber Look Venetian blinds can be used, but in both cases the blinds must be fitted as Face Fit to carry the blinds over the sliding door and any obstacles. In the case of Timber Look Venetian blinds consideration should be given to the stack height when the blind is drawn up to the top. This is to ensure there is sufficient clearance for a person to go in and out of the door without hitting the raised blind. Approximate stack heights are as follows:

Drop of the Blind mm80010001500200025003000
Stack height (from top of blind) mm140155190230270310

Sometimes it is necessary to fit the blind above the architrave to achieve adequate personal clearance.

The most common blind fitted on these windows is a vertical blind. This type of blind gives ideal heat and light control through the operation of angling the blades but also can be fitted across the whole window, whilst using the wand to draw back the blades sufficiently to allow access through the door.


These blinds can be fitted either as Recess Fit or Face Fit, but for Recess Fit there should a frame depth of 70mm to allow the blind to fit flush with the front of the window frame. Choose which side you want the control cords to sit.