For an outside mount, blinds should overlap the window by 1.5 to 3 inches (4 to 7.5 cm) on each side and 2 to 3 inches (5 to 7.5 cm) at the top. This overlap is necessary to block unwanted light gaps, provide privacy, and cover the mounting hardware.
To minimize light leakage we recommend that the blind overlaps the window recess by at least 70mm at the top and 50mm each side. The overlap at the bottom of the blind is a matter of personal choice but please take into account obstacles such as radiators.
Most manufacturers recommend installation at least 3 inches above the window or door opening. Measure the height from the headrail location to the sill at the left, middle and right sides of the frame.
Measure both the width of the window and the height of the window. Consider adding an extra 3 inches to the width and height for optimum light control and privacy. Extending the blinds outside the window will also provide the space needed for the mounts and help the window appear larger than it actually is.
Add an overlap of 3” on each side of the window (6” total) to allow for more privacy and light blockage. Please note: Factory Deductions: Inside mounted products have a light gap between 1/8” and 1/4” on either side of the window – this gap is required in order for the product to operate properly.
In the U.S., the uncovered window is perhaps less an expression of communal trust than one of personal protection. Wealthier homeowners, who can also afford state-of- the-art security systems, may not feel that they need shades. These curtainless windows have become one of our subtlest statements of privilege.
Yes, for your blinds to work to greatest effect and to achieve the right visual finish, window blinds should rest on the windowsill. The only exception to this is vertical blinds which require a small amount of clearance to prevent the louvres from dragging on the windowsill when operated.
Up (Rounded Side Facing Out)
Blinds turned in this direction offer more privacy and light control since the convex side faces the window, blocking light or views from the outside. However, having the rounded side facing out may not be as aesthetically pleasing as when the rounded side of the slats faces in.
2026's Best Blinds
One common mistake is not measuring the width and height of the window in multiple places. Windows can vary in their dimensions depending on where you measure them, so it's essential to measure the width at the top, middle, and bottom, and the height at the left, middle, and right to accommodate any unevenness.
In 2026, vertical blinds are enjoying renewed popularity thanks to improved fabric textures, soft weaves and more elegant louvre designs that look less “office-like” and more stylish in modern homes. Wider louvre options, blackout vertical fabrics and wipe-clean materials have expanded their versatility.
Best Rule: Daytime → tilt blinds up for maximum privacy. Nighttime → tilt up if lights are on inside; tilt down only if you want more natural light during the day.
Use Side Channels: Install side channels alongside the window edges to block light gaps. This is especially effective for blackout blinds in bedrooms or media rooms. Layered Window Treatments: Pair a blind with curtains or a pelmet to cover light gaps and add a decorative touch.
Inside recess blinds are particularly effective for blackout blinds, as the tighter fit allows less light to seep around the edges, creating a more effective barrier against external light sources. This precision allows you to customise the ambiance of your room effortlessly.
Trending Window Treatment Ideas for Every Room
Ditching shades has a lot of upsides regardless of who you are. Uncovered windows bring in natural light, boost well-being, and offer a view of the world outside. The trade-off, of course, is that they also put those inside on display to passersby, and in the summer, they channel heat.
The most popular type of window treatment is faux wood blinds. Their classic look, simple design, and long-lasting durability have made them the most popular kind of window covering for the last several years. Covered with PVC, faux wood blinds are the best option for homes in high-humidity climates.
Some of Stewart's homes utilize interior blinds for light regulation and privacy. Others feature windows framed by exterior shutters, operable versions of which can also be used for light control, ventilation and privacy.
Blinds can be lighter or darker than your walls, but there are a few things to keep in mind before choosing a color. To ensure that everything blends well together, the blinds and walls should be at least one shade lighter or darker than each other, but most importantly, they should also be a similar tone.
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For the best light control, it's best extend your blinds by two to three inches on each side beyond the window trim.
Even though ornate valances were once a staple in traditional-style homes, they are now considered outdated. "Avoid overly ornate valances, which can feel dated and heavy," says interior designer Danielle Chiprut. "They can feel at odds with today's preference for light, airy interiors."
Thankfully, Stewart was quick to ease our curtain concerns. She says, “They're beautiful, I don't have anything against them, I just don't live with them… I like to look outside. Every window [in my home] looks out to something nice, and it's just all open to the view.”
You want it to feel, cosy warm and inviting so keep this in mind through the decorating process. Fullness is important in transforming the look and feel of the space and this is created when blinds are layered beneath curtains. For a real cosy, layered effect roman blinds provide an ideal solution.