I realise this could be entitlement / snobbery / nimbyism, hence looking for a genuine perspective on whether IABU.
We live in a quiet, semi-rural steading conversion, so a smallish cluster of houses in converted farm buildings. We’ve lived here for 20+ years, and it has always been blissfully quiet.
2 years ago the last working farm building was sold off to someone who converted it, and now they live there - young family in their late 20s with toddlers (we are in our 40s with teenagers).
The problem is, they are so very loud 
Their conversion forms a courtyard, and they just treat the courtyard as another room of the house. They usually have double doors open, TV or music on, shouting from one side to the other.
It carries right through the area. There is no getting away from it, even going for a walk in the previously quiet fields.
We have had some respite in the winter when it was cold, but they are back to normal today and I just know it will be like this until autumn.
Do we just need to suck it up and accept that we have been lucky until now?