Blackout Curtain Buying Guide (2027)

Measure the rod, not just the window. The closed curtain should be wider than the window frame so the panels overlap in the middle and cover the edges. For drop, measure from the rod to the sill for a sill curtain, or to the floor for a floor curtain, and remember that a rod hung above the frame adds length. Most blackout failures are measurement failures: a dark panel that is too narrow or too short is not a blackout curtain, whatever its label says.

Look for a lining, a second layer, a triple weave or a dedicated black backing. Single-layer flat fabric can dim a room without darkening it, and colour alone does not block light. White panels can darken well if lined, and black panels can fail if unlined and poorly fitted. Read the construction line in the listing, not just the product name, and favour lined and woven builds for bedrooms used for sleep.

Grommets slide fastest and suit curtains opened daily. Rod pockets gather beautifully and slide slowly, suiting rooms where curtains stay mostly closed. Back tabs sit between the two, with a tailored top edge. Self-adhesive panels skip the rod entirely for renters and temporary rooms. Choose the header for the daily routine, not just for the photo, because a curtain that is hard to open stays open.

Pairs suit standard windows. Single panels suit single windows and narrow openings. Wide doors need either one extra-wide panel or enough pair width to overlap properly in the middle. The centre seam is where most door curtains fail, so for a patio door, either buy a wide panel or buy more pair width than the door seems to need.

Check wash care before buying: most pairs wash on a cool cycle, but velvet and lined panels need gentler handling. Check the rod too: heavy lined and velvet panels need a fixed rod with brackets, not a tension rod. Finally, hang the rod wider than the frame and higher than the window where possible, since a wider, higher hang improves both coverage and the look of the room.