There are 5 sizes available:

  • 47mm
  • 64mm
  • 76mm
  • 89mm
  • 114mm.

Nobody chooses small louvres anymore and we don’t even carry them in our samples. The two most popular sizes are the medium 76mm and large 89mm louvre.

Anything smaller will be too busy and restrict the light and the really large 114mm louvres are reserved for really big windows, and although they are not listed here, they are available to order.

So the big question, what size to go for…

Remember, you don’t have to decide right now, we will bring some large samples out with us when we visit.

The example window in the video has all three sizes, small, medium and large. It’s the width across the louvre that we measure.

I wouldn’t entertain the small louvre anymore, but it’s good to show to put some perspective on the other sizes.

The medium louvre is a safe bet, slightly more traditional over the larger louvre, they look better on smaller windows and sash windows.

The large 89mm louvres will provide a modern simple look, they will let more light in, they are easier to clean and provide a better view back out through the louvres, so a good choice if you have a nice view.

If you have fairly large UPVC windows and your window sections are wider than 600mm wide and taller than 1200mm then the large 89mm louvres will look good.

If your window sections are smaller than this, then consider the medium louvres.

If you have a large door as well as windows, I would recommend the large louvres on both. As generally large doors have larger panels so they look more in proportion.

The same with a bay, so if you have a 5 or 7 section rounded bay window for example, then again I would suggest the larger louvre, if you go too small, the shutters will look very busy around the bay and they will restrict the light.

Louvres protrude past the back edge of the shutter, so if space is a premium and you only have a shallow recess and you have large handles, you might want to consider the medium louvres.

Split tilt

Now the great thing with shutters is the hidden split option, this is really cool.

You can split the mechanism that tilts the louvres within the shutter, this allows you to tilt the top section of louvres independently from the bottom section without having a large middle rail running through the middle of your panel.

On taller shutters, or if you want a more traditional look you can still choose to have a middle rail, as this also splits the louvres into two sections.

You can have the split on the medium or larger louvre sizes and at the height you want, but we would normally recommend that it lines up with a feature on the window.

I’d also suggest using this sparingly, as every time you split the louvres you’re doubling the number of louvred sections you have to tilt open or closed each day.

It’s definitely a good idea in bedrooms, and in windows where you are overlooked or close to a footpath.

Top and bottom rail size

The louvre size will affect the top and bottom rail sizes, this is due to the number of louvres the factory can fit within the height ordered. The top and bottom rails will get adjusted in width depending on the window height and louvre size.

In the video example, you can what happens to the rails if an extra louvre is added.

So expect these rail sizes to vary in height for the different windows in your house. The sizes range from 70mm – 120mm

As part of our ordering process, we will keep an eye on these sites, and if they are too big we might suggest a different louvre size or in some cases, the shutters can be made with smaller rails, but without a guarantee.