ᐅ Building a KALLAX Top Unit Yourself – Looking for Instructions!

Hello everyone,

I am planning to build an extension for my KALLAX shelving unit myself because I find the standard extensions too expensive and would prefer something tailored to my individual needs. Specifically, I am looking for instructions or experiences on the best way to create such an extension – including material selection, construction, and attachment to the shelving unit.

I want the extension to be sturdy, not too heavy, and visually compatible with the KALLAX. It would also be interesting to know if anyone has experience with custom-built extensions for doors or drawers, as I have some questions about those as well.

Are there any proven step-by-step guides or tips on what to watch out for during construction? Thanks in advance!

For a sturdy KALLAX topper, I recommend using 18 mm (0.7 inch) MDF boards. Simply cut to size, paint, and secure with brackets.

Saramar schrieb:
For a sturdy KALLAX topper, I recommend MDF boards with a thickness of 18 mm (0.7 inches).

That is a good starting point.

It is also important that the mounting solution supports the weight of the topper and any items stored in it. Metal brackets are suitable because they can bear high loads.

If doors or drawers are to be installed, it is advisable to choose matching hardware (hinges, drawer slides) that are compatible with the material thickness.

For the surface, paint or melamine resin coating are recommended to ensure an easy-to-clean and durable finish.

liskar schrieb:
If doors or drawers are to be installed, it is advisable to choose matching fittings (hinges, slides) from the start.

Exactly, pay attention to that. For drawers, you can use simple slides that are specifically designed for 15-18 mm (0.6-0.7 inch) panels.

Kojotan schrieb:
I want the attachment to be sturdy, not too heavy, and visually somewhat matching the KALLAX.

That’s a good starting point. I would recommend planning each step precisely since the attachment will usually bear some load and should harmonize visually with the KALLAX.

First, take precise measurements of the shelf, as there can be tolerances in the KALLAX system despite standardization. Then you need to decide whether you want to place a continuous panel as a top or prefer frame constructions that you close with panels.

For materials:
- 18 mm (0.7 inch) MDF is standard and easy to work with.
- Alternatively, plywood if you want greater stability, though it is more expensive.

The surface finish should be UV-resistant and preferably matte or satin acrylic paint.

For fastening:
- Brackets are the most common solution. Use 3–4 strong metal brackets to ensure stability.
- For drawers, it’s best to use full-extension drawer slides, which you mount securely and precisely.

Regarding the doors:
- Consider soft-close hinges if the weight allows; otherwise, standard adjustable hinges.

In general, I suggest creating a plan on the computer (e.g., SketchUp) to fully visualize the project before building.

What tools do you have available, and what is your experience with woodworking?

Dilen schrieb:
What tools do you have available, and what is your experience with woodworking?

I have a jigsaw, cordless drill, and a sander. I have some experience, but mostly at a hobby level. I can make straight and precise cuts, but I have less experience with complex constructions or building drawers.

@Dilen
Is there a particularly simple design for a sturdy attachment that can be built well with these tools? I want to minimize cutting and sanding to keep the project manageable, but I don’t want to compromise on quality either.