How to Measure for Venetian Blinds

First of all, decide if your blind is to be fitted inside or outside the recess.

If the blind is to be inside the recess give the recess measures as described below.

For blinds fitting outside the recess give the exact size required.

For bay windows see the guides below.

Next, establish the rail depth for the slat size of the blind type that you're measuring for using the table below.

Always use a metal tape measure as a cloth one can stretch and give an incorrect measure.

Venitian Blind Type	Slat-size	Headrail Depth
Aluminium	25mm	25mm
Aluminium	35mm	35mm
Aluminium	50mm	50mm
Fauxwood	35mm	50mm
Fauxwood	50mm	65mm
Wooden	25mm	50mm
Wooden	35mm	50mm
Wooden	50mm	65mm

Recess

Check that your recess is deep enough to fit the blind into, also bearing in mind any obstructions such as handles, etc.

Take 3 measurements for the width of the window recess as shown. Take the smallest of these measurements. This is the recess width.

Take 3 measurements for the drop of the window recess as shown in the picture. Take the smallest of these measurements. This is your recess drop.

Do not deduct anything from these measurements, we will make the necessary adjustments to ensure the blind fits perfectly

Exact

These are the measurement we need if you want you're blind to fit on the outside of the window recess.

Measure the width and height of your recess and add a little extra on the sides, top, and bottom.

The amount to add is really a personal choice however we suggest you add 10cm at the top and bottom, and at least 5cm on either side to ensure adequate coverage.

Don't forget to take into account any obstructions such as radiators when adding on the bottom overlap.

Measuring for square bay windows

First, decide if your blinds will be top fixed or face fixed.

Check the table above and establish the correct headrail size.

There are two options for measuring blinds. Option A gives better coverage across the front of the window whilst Option B gives greater coverage at the sides.

Option A

Measure the full width of the bay and order this blind as a recess measure.

Measure both side windows, however, this time deduct the headrail depth from this measurement. Again order these blinds as recess measures to allow for clearance between the blinds.

Option B

Measure both side windows from the front to the corner and order both of these blinds as recess measures.

Next measure the full width of the bay and deduct double the headrail depth (once for each side blind) and order this as a recess blind.

Important!

Whichever option you choose you will need to make additional allowances for any obstructions such as handles etc. that protrude into the bay.

Drop

To measure the drop simply measure from the top of where the blind will sit (normally the ceiling) down to the cill or the lower position.

Measuring for angle bay windows

First, decide if your blinds will be top fixed or face fixed.

Check the table above and establish the correct headrail size.

Using pieces of A5 card or paper cut or fold them into two strips. Ensure the width of strips A & B is equal to the headrail depth in the table above.

Move each piece of card or paper towards each other until they just touch, as shown at X in the diagram. Using a pencil, lightly mark the window frame or cill at this point.

Repeat this process for each angle around the bay.

Measure from the edge of the window to the first mark and note this measurement. Now measure from the first mark to the second and note this measurement, and so on around the bay until you return to the final corner.

Now double-check these measurements and order the blinds as recess measures. This will ensure adequate clearance between the blinds while still providing adequate coverage.

Important!

Whichever option you choose you will need to make additional allowances for any obstructions such as handles etc. that protrude into the bay.

Drop

To measure the drop simply measure from the top of where the blind will sit (normally the ceiling) down to the cill or the lower position.