From narrow to wide slats, each option has its advantages depending on your window size, the look you're going for and how much light and privacy you want. In this guide, we'll look at the different options to help you choose the best slat width for your windows.
What Venetian Blind Sizes Are Available?
Venetian blind slat width refers to the measurement of each individual horizontal slat, rather than the overall width of the blind.
Common Venetian blind slat sizes include:
| Slat width | General appearance | Often suited to |
| 15–16mm | Very narrow, fine detailing | Compact windows and discreet finishes |
| 25mm | Narrow, classic Venetian look | Smaller and standard-sized windows |
| 35mm | Medium-width, balanced appearance | A range of window sizes |
| 50mm | Wide, more prominent slats | Larger windows and contemporary interiors |
| 63–64mm | Extra-wide, bold appearance | Large windows and statement finishes |
Not every slat width is available in every material or product range, so it's worth checking your options before settling on a particular size.
At Aspiration Blinds, we offer a range of made-to-measure Venetian blinds with different slat sizes to suit your windows and preferences.
How Does Slat Width Affect Your Venetian Blinds?
Slat width isn't just an aesthetic choice. It can also influence how much natural light enters your room, your view outside and how the blinds provide privacy.
Appearance
Narrower slats create more horizontal lines across the window, giving the blinds a finer, more detailed appearance.
Wider slats have fewer, more prominent horizontal lines, creating a cleaner, bolder finish. They're particularly popular in contemporary interiors, although either style can work well depending on the look you're going for.
Light Control, Privacy and Your View Outside
Both narrow and wide Venetian blinds allow you to adjust the slats to control sunlight and privacy throughout the day.
Wider slats generally mean fewer horizontal interruptions across the window, which can provide a clearer view outside when they're tilted open. This can be particularly appealing for living rooms overlooking a garden or anywhere you want to make the most of the view.
However, slat width alone doesn't determine how much light a blind blocks or how much privacy it provides. The design of the blind and the angle of the slats also play an important role.
Which Venetian Blind Slat Width Is Best for Your Window Size?
Your window's size is a good starting point when choosing slat width, although there's no strict rule about which sizes you can use.
Small Windows
Narrower slats, typically around 15–25mm, can look more proportionate on smaller windows without overwhelming the space. However, wider slats can still work if you prefer a bolder finish and have enough room for the blind to fit.
Standard-Sized Windows
25mm and 35mm slats are versatile choices for standard-sized windows, offering a balanced appearance. You could also opt for 50mm slats if you prefer fewer horizontal lines and a more prominent finish.
Large Windows and Patio Doors
Wider slats, such as 50mm or above, often work particularly well on larger windows and glazed doors. They complement the proportions of bigger windows and can provide a less interrupted view outside when tilted open.
Does Slat Width Affect How Venetian Blinds Fit?
Yes. Different slat widths can affect the space needed to accommodate the blind, so it's worth considering a couple of practical details before choosing.
Window Recess Depth
Wider slats and their accompanying headrails may require more space within the window recess. If your windows have shallow recesses or handles that project into the fitting area, it's important to check there's enough clearance for the blind to operate properly.
How Much Space the Blind Takes Up When Raised
When Venetian blinds are fully raised, the slats gather together at the top of the window. The space they occupy is known as the stacking height.
Slat width and the blind's overall construction can affect how much space this takes up, which is worth considering if you want to keep as much of your window uncovered as possible.
Are Wider Slats Better for Wooden Venetian Blinds?
Wider slats are a popular choice for wooden Venetian blinds because they create a more substantial, shutter-inspired appearance. However, narrower wooden slats can look just as effective, particularly on smaller windows or where you prefer a finer finish.
Available slat widths will vary depending on the range, so it's worth exploring the different options before deciding.
Slat width is also just one of several styling choices. You can personalise wooden Venetian blinds through different wood colours and finishes, as well as choosing between decorative tapes or traditional cords. We've covered that decision in more detail in our guide to wooden Venetian blinds with tapes or cords.
Made-to-Measure Venetian Blinds from Aspiration Blinds
Choosing the right slat width is much easier when you can see the different options against your own windows.
During a free home consultation, our team can help you compare suitable slat sizes, consider the proportions of your windows and check there's enough space for your chosen blinds.
We'll also take care of the measuring and professional fitting, so your made-to-measure Venetian blinds look and function exactly as they should.
Explore our range of Venetian blinds or get in touch to arrange your free home consultation.