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How to add a roommate to your lease
Read your current lease.
Your current lease may have clauses regarding the procedure for adding new tenants.
Your lease may include a clause that sets forth the requirements for new or additional tenants.
If you see such a clause, make sure your prospective roommate meets those requirements. If your lease doesn't have that clause, you can get a good idea of what your landlord requires in new tenants by thinking back to what was required of you when you applied to rent your unit.