Keeping the neighbours on side
Most games room trouble is noise, not planning. Terraced and semi-detached gardens around Huddersfield are close together, and a stone wall at the back of a garden carries sound further than you would expect.
Three things help: place the door and the biggest glazing facing your own house rather than the neighbours, add acoustic insulation (mineral wool rather than foam boards in the walls), and keep the speakers off the wall that faces next door. A room built this way can host a match night without anyone knocking on the door.