How to mediate a fight between two roommates
Ask both people whether they want help and whether it is safe to meet. Set a short agenda, one speaker at a time, and a goal of a practical agreement. Summarize each person’s concern before moving to solutions.
Focus on observable facts and future behavior: payments, noise, chores, guests, or communication. End with a written plan, deadline, and check-in date.
If there are threats, harassment, violence, or a large legal dispute, use a qualified outside resource instead of informal mediation.