Is "making necklaces and bracelets" enough for that? Some people do that anyway.
No. A side job is by no means a business ;) In my neighborhood, there is a community with a commercial unit: Here I have a satellite image from Google:

At the bottom, you can see at the street where it ends and the residential area begins. By the way, at the top left is a show house from Schwörerhaus, which they wanted to sell a few years ago. Nobody wanted it for about 500,000€. That wasn’t cheap in our area back then. Now, since the end of last year, this house is being sold. The price fits in with the other offers. A business must be there, then an apartment is legitimate. (By the way, the houses look similarly elegant – most are faced with bricks, but many dormers, mullioned windows, and ornate architecture. Cheap construction is hard to find. But see for yourself:

But as already said: business! And they are no bargain!