Working construction on Sundays?

But when he started shaking the driveway around 12:30 p.m., I had to intervene. Our then 1-year-old child couldn't sleep and just kept crying... no wonder with that noise...

The baby has to sleep at 12:30 every day, not just on holidays. So the excuse is rather weak. We also have a one-year-old, and 10 meters away (our only real direct neighbor) is building right now, and it gets loud during the week as well. As if anyone would care about a lunch break. Either he sleeps then or tough luck. @ and I'm not exaggerating. Actually, the rule violations here are even much more serious.

On Sundays, heavy equipment must not be operated and this must be respected. If not, off to the [Ordnungsamt] or [Polizei].

We are very lucky not to have any direct neighbors. The nearest ones are a few hundred meters away with a bit of forest in between. We wouldn’t intentionally make a lot of noise on Sundays, but we don’t restrict ourselves much. Nobody hears it anyway except us. But I find it important not to disturb the neighbors!