Expansion joint in clinker, yes or no

We now have a connection joint on each side - the brickwork was not laid around the corner, but rather separately in front of each house wall on its own.

and sebastian79:
could you please upload or send me a photo of it?

if it's an expansion joint, does it have to be at every corner (=4 pieces) or is it enough to equip just one front with a joint, or how else?

Here in the area, facing with klinker is not so common and I generally don't know how well the companies can really handle it.

Our exterior dimensions are 8x9m, so according to the building expert, we don't need a joint.
However, we have a basement (half above ground).
The underground part will be concreted, the above-ground part will be double-walled masonry with plaster.
The ground floor and upper floor above will then have klinker.

Is a basement now a reason for a joint or is it still irrelevant? I couldn't quite make that out.

I do not know the exact reasons. However, I have about 9x12, also "basement" (i.e. cellar), on which the bricks rest. At least in summer, the south-facing bricks do get quite warm, and in winter, of course, cold again. In the literature, the coefficient of expansion is given as 0.4 mm/(m100K); if the temperature difference between summer heat and winter cold is about 70° as the worst case, that results in an expansion difference of 3.3 mm on the long side for me. That does not sound too bad, but this expansion is basically "unstoppable" and can certainly cause a few cracks or loosen connections (in the mortar).

So I also have to say that the joints do not stand out at all - but maybe one just becomes blind to them.

If our site manager hadn't pointed it out to me, I wouldn't have even seen the expansion joints...

What bothers me about it is that it goes down as a vertical line, I have noticed this before with other houses in the past and it has always bothered me