Hufflepuff Basement

"It is a very cosy and welcoming place, as dissimilar as possible from Snape's dungeon. Lots of yellow hangings, and fat armchairs, and little underground tunnels leading to the dormitories, all of which have perfectly round doors, like barrel tops."

- A description of the Hufflepuffs' common room.

The Hufflepuff Basement is located behind a still-life portrait of a fruitbowl near the kitchens of Hogwarts Castle. A password is presumably required to enter it, which is spoken to the portrait. A hole or passage-way is behind the painting, leading to the common room, which is a room where Hufflepuff students can relax after a long day of studying. The common room is full of fat armchairs, yellow hangings, and probably a bulletin board where school notices, ads, lost posters, etc. can be posted.

Dormitories
The Hufflepuffs' dormitories are also located in the cellar, with perfectly circular doors leading off from the common room that open to tiny underground tunnels. One of them leads to the girls' dormitory, the other to the boys. In each dormitory are five beds, presumably decorated with yellow hangings and the Hufflepuff badger.

Behind the scenes

 * The Hufflepuff Basement was the only common room that Harry Potter did not enter at some point.
 * In Lego Harry Potter: Years 1-4, the common room contains many plants and flowers, making it the only Common Room to do so. This is probably a reference to the then Head of Hufflepuff House, Pomona Sprout, who also occupied the post of Herbology Professor.

Appearances

 * Harry Potter and the Goblet of Fire
 * Harry Potter and the Deathly Hallows
 * Lego Harry Potter: Years 1-4