One of the original houses when the guild was first build, it takes it's name from the architects drawings, room B2 on the plan.
It has produced two infamous 'disgraced old boys', a term used by the assassins for someone who has failed to uphold the good traditions of the Assassins' Guild. Usually they killed people without charging money. Not a good precedent to set.
List of current and past members of B2 House: