ᐅ What to do if BILLY shelves are too short?

Hello everyone,

I am currently facing a problem with my BILLY shelf from IKEA. Unfortunately, the shelves are too short, which creates small gaps between the side panels. This is frustrating, especially because I want to use the shelf for rather heavy books, and the stability suffers as a result.

Does anyone know this issue and have suggestions on how to extend or reinforce the shelves without having to buy a completely new unit? Maybe there are practical retrofit options, DIY solutions, or suitable alternative products.

I would appreciate any tips that could make the shelf functional again. Thanks in advance!

onlau schrieb:
Unfortunately, the shelves are too short, causing small gaps between the side panels

That sounds unusual at first, as BILLY shelves are normally very precise in size. Have you checked if the side panels are actually straight and not warped? Sometimes warped wood or incorrectly installed side panels cause the shelves not to sit properly.

Alternatively, you could measure the shelves themselves, as many users often underestimate small differences here. If they really are too short, it would be helpful to know whether you have original IKEA shelves or replicas. Replicas are sometimes shorter, which could explain the problem.

Also: how much weight are you planning to place on the shelves exactly? Often, adding a central support or a reinforcing profile helps, instead of replacing the shelves.

Could you describe in more detail how large the gaps are and whether you can remove and swap the shelves?

Hello onlau,

First of all, thank you for your detailed description. I am somewhat familiar with the problem you described regarding the BILLY shelf: especially with older or well-used shelves, the shelves can warp slightly, or the connectors on the side panels might loosen a bit, causing the shelves not to rest firmly anymore.

Here are a few solutions I can recommend based on experience:

1. Measure the exact length and depth of the boards.
2. Consider replacing the shelves with suitable plywood or MDF boards, which you can have cut to size at a hardware store—this way, you can precisely adjust the width.
3. To stabilize: attach small metal brackets or shelf supports to the side panels to secure the shelves.
4. If you have some DIY skills, you could glue or screw sturdy strips to the sides of the shelves to increase the enclosed surface area and improve stability.

There are also special shelf supports with front clips that can help hold the shelves more securely within the cabinet if the side grooves no longer fit perfectly.

What are the exact dimensions of your shelves, and how thick are the shelf boards? Then I can provide more specific recommendations.

kasan schrieb:
That sounds unusual at first because BILLY shelves are usually very precise.

Well, IKEA products aren’t always as perfect as people assume. Especially with BILLY, there can sometimes be slight variations, and if the shelf has been used for a few years, things can shift over time.

sarlo schrieb:
Maybe just replace the shelves with suitable plywood or MDF boards, which you can have cut to size at the hardware store

I think that’s the best solution. In my opinion, DIY is the way to go here—extending or even replacing the standard shelves offers much more flexibility. You could even consider using thicker or sturdier materials instead of the standard BILLY shelves, which are quite thin and tend to bend more easily.

By the way, I’m skeptical whether adding metal brackets really helps with "stabilizing." If the shelves are too short, brackets won’t do much. The forces mostly act along the sides and edges. Instead, you might want to think about adding a central support beam.

I’m curious if anyone here has specifically adjusted MDF boards and if that worked without much hassle?

Have the shelves cut to size at the hardware store. Use MDF or plywood, depending on the weight. Secure the corners with wood glue and a few screws.

Then attach the shelves using shelf supports from IKEA. Problem solved.