My first 2 piggies only had the Ferplast 100 when I got them. We didn't really know that time how big is the required home for them, even though hubby has been keeping guinea pigs for a long time. After just a few months, we started getting a bigger home for them because I asked hubby to buy them a bigger house. Then the 2-floor hutch still isn't big enough for them so I started letting them out running in our living room during daytime and just lock them in the hutch during bed time. Eventually, I just decided to attached C&C at the bottom of their hutch so they still have a big space whenever they needed to be locked up.
Our guinea pigs since then (that was 2012) owned our living room. We adjusted everything and even had to throw furnitures we never really used just so we can have bigger space for us and the piggies.