Yes, that is often one of the simpler bathroom layout changes because the toilet can stay connected to its existing soil route while the bath area is redesigned as a shower. The bath waste may also be near a useful drainage route, although the shower waste still needs the correct fall and connection.
The exact shower size depends on the former bath footprint, door position and how the screen will control water. If you want a very low tray or walk-in appearance, floor construction becomes more important.
Doherty's Glasgow bathroom installation service can survey the existing bath area and show whether the change can be achieved with minimal drainage alteration or whether additional floor work is needed.
