All your stories are relatable, please pardon my long post: I have had 2 sets of neighbours doing building work on the same house on and off for 8 years!! The first couple with young children completely gutted the unmodernised house next door, in stages, over 4 years, so we had constant noise, dust, etc. At one point, I had just come home from hospital after surgery and was in pain; I texted the owner if the builders could please work away from the area near my bedroom window because the noise was terrible, but no luck. My partner had to call him to politely insist. They later sold the completely renovated house to another, even younger couple, who have decided to excavate their basement to build a playroom for their two children who are both under 5, because their parents said there were too many toys strewn around the house..the in laws also thought they should do some extra work to the wet room, do some landscaping, and so on.
I agree with the other posta above, especially with the ones about having an agreement as to costs for damage, as that is another issue I have to address.