@birofunk, instead of thinking about acoustic screening or dense planting, you should consider installing a water feature across the split level, to drown out the unwanted conversations. It doesn't need to be niagara falls, but something you could switch on and off when you are outside. Leafy dense vegetation can be planned around that if you want a lost gardens of heligan or exotic jungle look. A water feature will also add a new dimension with fish and even attract wildlife.
@birofunk, instead of thinking about acoustic screening or dense planting, you should consider installing a water feature across the split level, to drown out the unwanted conversations. It doesn't need to be niagara falls, but something you could switch on and off when you are outside. Leafy dense vegetation can be planned around that if you want a lost gardens of heligan or exotic jungle look. A water feature will also add a new dimension with fish and even attract wildlife.