Blackout Blinds: The Complete Guide to Total Darkness

Blackout blinds use a fabric with a dense, often triple-woven or coated construction that blocks light almost entirely, rather than just filtering it. If you've ever struggled to sleep past sunrise or fought screen glare in a home theatre, this is the fix.

How blackout fabric actually blocks light

Standard blind fabric lets some light pass through the weave itself, even when fully lowered. Blackout fabric is woven far more densely, and often has a foam or acrylic backing layer bonded to it, so light can't pass through the material at all. What it can't fully solve on its own is light leaking around the edges of the blind — which is where mounting choice matters more than people expect.

Mounting for maximum darkness

• Outside mount with side channels gives the darkest result — the blind extends past the window frame on all sides and can be paired with tracks that block edge light almost entirely.
• Inside mount looks cleaner but will always let a thin line of light around the frame, since the blind sits within the recess rather than covering it.

If total darkness matters more than the built-in look — a nursery for daytime naps, or a media room — outside mount is worth the slightly larger footprint.

Best rooms for blackout blinds

• Bedrooms — especially east-facing rooms that get early morning sun.
• Nurseries — daytime naps depend on darkness a lighter fabric can't provide.
• Home theatres and media rooms — screen contrast and glare both improve dramatically with true blackout.
• Shift workers' bedrooms — sleeping during daylight hours needs the same darkness a nighttime sleeper gets for free.

Pricing and fabric choice

Blackout is a fabric grade available across most of our blind styles — roller, roman and motorised — rather than a separate product line, so pricing follows the same per-square-foot model as the base style, with a modest premium for the denser fabric. You'll see the exact figure as you configure a size on any blackout blinds product page.

Unsure whether inside or outside mount suits your room? Our mount guide covers exactly this, so you can pick the mount that gets you the darkness you need for that specific window.