- Coomon Rooms are where the people in a certain house spend free time or do homework (other than the library)
- Only people who are in the correct house can enter the common room (eg. Only Gryffindor members can enter the Gryfindor common room.)
- However - as in the Chamber of Secrets - by brewing a polyjuice potion members of other houses could enter the Slytherin common room.
- The Common room often has a fireplace and leads off to the girls and boys dormetries.
See Common Rooms for more information.