How do you change your house on Pottermore?

Answer 1

You can't. Once you have taken the quiz and have been sorted you're stuck with that house. If you answer honestly, you should be happy with your house. The only other way to change is to register a new account.

Answer 2

By duelling, collecting items and making potions.

Answer 3

You can't, once you have chosen your pet, it becomes your avatar.

Answer 4

Houses cannot be changed once you have been sorted.

Answer 5

No, you can't. The only way to get a new house is to make a new account.