Buying guide
Shutter louvre sizes explained: 47mm to 89mm
Louvre size is the decision that most changes how a finished shutter looks, and it's the one homeowners think about least. Here's how to choose without seeing a showroom.
15 April 2026 · 5 min read
The sizes and what they do
- · 47mm — small and traditional. Suits cottage windows and narrow panels where a big louvre would look heavy.
- · 63mm — the safe middle ground; balanced on most standard UK windows.
- · 76mm — the most popular modern choice. More light, more view, fewer louvres per panel.
- · 89mm — bold and contemporary, best on tall or wide panels where there's room for the scale.
Bigger louvres, more daylight
Wider louvres mean fewer of them in the panel, so when they're open there's less material blocking the glass and more of the view. On a dark north-facing room that's a real difference, not just a styling preference.
Match the louvre to the window, not the whole house
It's fine to run 76mm through the main rooms and drop to 47mm on a small landing or cottage window. We bring samples to survey so you can hold them against your own light rather than judging from a photo.
