What else do people put in them?

Whatever they actually use. Air hockey, darts, a table football, an arcade cabinet, a wall of board games, sim racing rigs, or simply a big screen and comfortable seating. Some rooms are a dedicated space for one thing. Most end up multifunctional, doubling as a hobby room during the week and an entertainment space at weekends. We can customise the layout around what you own now and what you are likely to add later.