I didn't know subleasing without permission was illegal so I just had them move in. Most leases prohibit subletting, or only allow it with permission.However, it probably violates the terms of the lease that they signed because most leases prohibit subleasing without approval of the landlord. The lease agreement plays a significant role in determining whether subletting is permitted. If your lease explicitly prohibits sublets, that restriction holds. Obtaining Consent to Sublet. According to California law, tenants must get their landlord's written permission before subletting their apartment. Comprehensive guide to California landlordtenant law. Learn key rules, rights, and responsibilities for landlords and tenants. Yes, you may have legal options to recover the rent you paid to your landlord if they were subletting illegally and pretending to be the owner of the property.