I hadn't realised that my rat room pics weren't on here!
I'm lucky to have a purpose built room - the door is glass and opens outwards so that I can watch rats free ranging before I go in, and won't risk running any over with the door! There is a sink and storage space just outside the room, and inside, I have a corner by the door for my table with wall cupboards over it, and also a large high level shelf at the far end for storage.
The first set of pictures are from 8 years ago, when I had 3 duettos, and a brio, as well as various other temporary cages for litters and visitors which would go on the shelving units as and when required.
Skip forward 3 years, and I had replaced my oldest duetto with an SRS.
And my current room layout - 2 SRSs, an explorer, and 2 duettos
(The large sheets of cardboard between the cages makes for a more peaceful room!)