We purchased a terraced house last year and the neighbours on both sides have complained to us about noise. We have two young DC (3 and 5) and whilst they're not perfect, they're not wildly loud either (though they do get up early at 7, they are also in bed by 7!) Both sets of neighbours are younger people who do not have children. One of them works nights.
One complained that she could hear us walking up and down the stairs, they apparently have an extra bedroom made up on the ground floor and this is bothersome to her if she sleeps there. (Though it was also exaggerated as DH works from home and is alone all day and certainly not stomping up and down throughout the day, his office is on the ground floor). She also knocked on our door on a Sunday at 10a.m. and complained about noise. They also left a note in our postbox that they could hear one of our doors closing (there was a broken hinge so it sort of clanged shut) but we fixed it when we realised they could hear it. The neighbour on the other side complained about noise from the children singing at 11 a.m., which is bothersome to her as she works nights.
I think we're generally respectful neighbours (we were in a terraced house previously and got on well with the neighbours on both sides there, both of whom had adult children so perhaps were more understanding of children's noise and sleep rhytmys?) and try to be mindful of the children's noise at early hours, close windows, etc. And as DH works from home we always accept their parcels for them. But the couple who owned our home previously were older and retired, one was disabled so they lived almost entirely on the ground floor and didn't use the rest of the space much, and I suspect our neighbours got used to that level of silence.
I am a people pleaser and one neighbour has been a bit cool to me lately, which makes me uncomfortable. I do understand that younger people without children have different sleep habits than we do, but I also hate feeling like I have to tiptoe around my own home and shush the children if they're just being children. But also 11 a.m. on a Sunday is...really not that early. We're not a generally noisy family, no blaring telly or radio, we're not shouty, the children don't have many tantrums, and generally play nicely together (so not loads of screaming on a regular basis).
If you live in a terraced home, how much consideration do you give to your noise and your nieghbours?