7.35 am on a Saturday morning is pretty inconsiderate. specially if they’ve just moved in. Did they not approach you at any stage to inform you they would be doing works? If not, they strike me as inconsiderate people; it’s just simple courtesy to think of such things.
As you’re probably going to have to live next to them for some time, I’d suggest just having a friendly word; it is entirely possible they may not have tohught that the noise would travel. Mid you, it doesnt take a genius to work out that it might be an issue.
I think the accepted time for weekday loud noise for works is 8 am. We had council contractors in next door doing works with a pneumatic drill. Started the first day at around 7.30ish. Next door to myneighbour with the constantly crying baby. You only piss off a post-natal sleep deprived woman expert n property law, suffering from cbin fever, once. 😯