ᐅ KALLAX unit wobbles under load – any experiences?

Hello everyone,

I recently bought a KALLAX shelf unit from IKEA and assembled it as a single module due to limited space. When I load it, I notice it wobbles slightly at the front edge—especially when placing heavier items inside or setting them on the edge. I have checked all the connections, and everything appears to be assembled correctly.

My question to the community: Has anyone had similar experiences? Is some wobbling normal for a single KALLAX module, or could this indicate a design issue? I’m asking because the shelf feels quite unstable despite proper assembly, and I’m concerned about its stability.

Are there any tips on how to improve stability without having to buy a complete shelving unit or install additional expensive brackets?

Thanks in advance for your feedback!

Wobbling in a single KALLAX unit is unfortunately common when installed normally.

The shelving unit is designed for wall mounting and multi-unit configurations.

Use brackets or secure the unit to the wall to improve stability.

Regarding the stability of the KALLAX unit: The shelf is actually designed as a modular system, where multiple units stabilize each other.

A single module is mainly made of particleboard, which has some flexibility. Wobbling often occurs due to missing horizontal and vertical reinforcements on the back panel or a lack of wall mounting.

A simple way to improve stability is to add extra brackets or a solid back panel reinforcement, which significantly reduces bending and wobbling.

Alternatively, using non-slip pads or felt glides can help prevent micro-movements on the floor. Wobbling is often also caused by uneven flooring.

Oh yes, I totally know this feeling! I had a single KALLAX unit standing alone and at first thought it was broken or assembled incorrectly. But this is actually typical for individual units.

I simply stuck self-adhesive brackets on the inside corners of the back panel. That made my shelf really stable! It’s so much better when the shelf doesn’t wobble anymore – you really appreciate that small DIY success! :-)

And don’t worry, these are inexpensive parts and very easy to attach, so just give it a try!

Peose schrieb:
I simply stuck self-adhesive corner brackets on the inside corners of the back panel. That made my shelf really stable!

That’s a good tip.

For improving stability, there is also a more professional solution: installing an additional HDF (high-density fiberboard) panel as a backboard, securely fixed with robust screws, significantly increases rigidity.

This measure prevents both wobbling and deformation under load. Alternatively, attachment to the wall should also be considered, which is always the safest option from a structural point of view.