Are all on-campus accommodation options single rooms or are any shared and how many people live in these different accommodation types?

All UWA College provided accommodation options are single rooms.

In residential colleges, students live in a single room and have access to boarding style communal spaces, for example, a dining hall, a gym or a series of lounges.
For purpose-built student accommodation like Yugo and The Switch, the apartments are designed to be shared among 5 or 6 people, each with their own room. The shared facilities include a kitchen and bathrooms.

For the privately leased UWA College Rental Apartments, the apartments are designed to be either a studio, where you will have your own bedroom, kitchen and living facilities, or a 2 bedroom shared apartment, where you will have your own single room but share kitchen and bathroom facilities.