This type of situation does not fall under the Residential Tenancies Act because you are not considered a landlord. You are a head tenant and the person you are renting to is your roommate. You should obtain legal advice on this issue from a lawyer or paralegal. We can only provide legal advice to landlords and property owners that are covered by the RTA. Contact the Law Society Referral Service at www.findlegalhelp.ca or the Community Legal Education Ontario (CLEO) at www.cleo.on.ca for more information about evicting your roommate.