Why Are My Roller Blinds Crooked or Uneven

Roller blinds go crooked for a handful of reasons, most of which come down to fitting rather than the blind itself.

Uneven brackets, an out-of-square window, or fabric that’s been wound unevenly on the tube will all produce a lopsided drop.

What You’ll Need

Tools

• Spirit level
• Tape measure
• Pencil
• Screwdriver (flathead and Phillips)
• Power drill and drill bits
• Wall plugs (if re-drilling into masonry)

Materials / Replacement Parts

• Replacement brackets (if existing ones are cracked or stripped)
• End caps (if the roller tube has shifted in its socket)
• Replacement roller tube (only if the tube itself is warped beyond correction)

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How to Fix It: Step-by-Step

Step 1: Check Your Brackets Are Level

This is the most common cause, and it’s the first place to look. One bracket sitting even a few millimetres higher than the other will angle the whole blind.

1. Take your spirit level and hold it against the underside of both brackets together (a long rule or straight piece of timber helps here).
2. If the bubble’s off, mark the correct height on the wall in pencil before doing anything else.
3. Remove the lower bracket and re-drill at the correct height, using fresh wall plugs if the original holes are too close to the new position.
4. Rehang the blind and check the drop before screwing everything fully tight.

Step 2: Check Whether the Window Is Actually Square

Windows are not always square, especially in older properties. If the reveals are off, a perfectly fitted blind will still look crooked against the frame.

1. Measure the width of your window at the top, middle, and bottom.
2. Measure the height on both the left and right sides.
3. If the measurements differ, the window is out of square. The blind itself isn’t the issue.
4. In this case, adjust the bracket heights to compensate so the fabric drop looks level even if the brackets technically aren’t at identical heights relative to the frame.

Step 3: Inspect the Roller Tube and Fabric Wind

If the brackets look fine but the bottom bar still hangs at an angle, the problem is likely in how the fabric is wound onto the tube. Fabric that’s tracked to one side will pull unevenly as the blind drops.

1. Fully lower the blind and look along the bottom bar from the front. One side hanging lower than the other confirms the fabric has drifted during winding.
2. Detach the blind from its brackets and fully unroll the fabric off the tube by hand.
3. Lay the fabric flat and check the bottom edge with a tape measure to confirm it’s cut straight. A wonky cut at the factory is rare but not impossible.
4. If the fabric is straight, re-roll it onto the tube carefully, keeping it centred and applying even, light tension across the full width as you roll.

Step 4: Refit, Test, and Fine-Tune

Once you’ve made your adjustments, rehang the blind and test it through a full cycle before calling it done.

1. Clip the blind back into its brackets and lower it slowly, watching the bottom bar as it drops.
2. If it tracks slightly to one side, the tube may need to sit differently in its end caps. Most roller mechanisms have a small amount of lateral adjustment built in.
3. Push the tube gently in the direction needed and test again.
4. If the tube feels loose in one bracket or keeps dropping out, the bracket or end cap may be worn and worth replacing. They’re cheap and available as spare parts from most blind suppliers.