Why Are My Pleated Blinds Uneven or Crooked

Pleated blinds go uneven for a handful of reasons: a headrail that’s not sitting level, worn or broken cords, or pleats that have slipped off their guides.

Most of the time it’s fixable without calling anyone out.

What You’ll Need

Tools

• Spirit level
• Screwdriver (flathead and Phillips)
• Small stepladder or sturdy chair
• Scissors
• Needle-nose pliers

Materials / Replacement Parts

• Replacement blind cord (match the diameter of your existing cord)
• Cord locks or cord connectors (if the lock mechanism has failed)
• Replacement pleat tape or carrier strips (if pleats have separated from the tape)
• Spare cord guides or sliders (if any are cracked or missing)

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How to Fix It: Step-by-Step

Step 1: Check the Headrail Is Level

This is the most common culprit and the easiest to rule out first. A headrail that’s dropped even 2-3mm on one side will make the whole blind look twisted.

1. Take the blind down or hold a spirit level against the headrail while it’s in position
2. Check each bracket individually. One bracket shifting is enough to throw the whole thing out
3. If a bracket has come away from the wall or ceiling, re-drill and use a raw plug rated for your wall type
4. Refit the headrail and check level again before moving to the blind itself

Step 2: Inspect the Cords

Pleated blinds use a series of cords threaded through the pleats to keep everything aligned. When one snaps, the whole side drops. When one stretches, the blind tilts.

1. Raise the blind fully and look along the cords from the side. Uneven tension is visible
2. Run your fingers down each cord from top to bottom, feeling for knots, fraying, or breaks
3. Check where the cords pass through the cord lock at the headrail, as this is where most wear happens
4. If a cord is snapped, note the routing path before removing anything so you can replicate it

Step 3: Restring or Replace the Cords

If you’ve found broken or badly stretched cords, restringing is the fix. It takes patience but it’s not complicated.

1. Buy replacement cord in the same diameter as the original (usually 0.8mm or 1mm for pleated blinds)
2. Thread the new cord through each pleat hole following the same path as the old one
3. Make sure the cord runs through every guide and spacer bar along the route. Missing even one will cause the pleat to bunch
4. Tie off at the bottom rail and tension evenly before locking at the headrail
5. If the cord lock itself is broken, replace it. A failed lock means the blind won’t hold any tension regardless of how well you’ve restrung it

Step 4: Realign the Pleats and Test

Once the cords are correct and the headrail is level, the pleats should sit flat. If they’re still folding unevenly, the pleat tape may have separated.

1. Lay the blind on a flat surface and press each pleat back into position by hand
2. Check that the carrier strips or spacer bars are sitting horizontally across all pleats at regular intervals
3. If a spacer bar is cracked or missing, replace it before refitting the blind
4. Refit the blind, raise and lower it three or four times to let the cords settle, and check the bottom rail sits level