If you have a lease for a set term, like one year, you can sublet with or without your landlord's permission, unless they prohibit this in the written lease. However, many subleasing agreements and jurisdictions now provide that the landlord cannot unjustly refuse consent for a sublease or assignment.Need to sublease your rented apartment? Here's why you should obtain your landlord's consent first. Tenants generally can't sublet their unit without the landlord's consent. Protect your rentals with Avail lease agreements and amendments. When a tenant asks its landlord to consent to a sublease the Landlord will rightly focus first on business concerns. Who is the subtenant? Subleasing without your landlord's permission may violate your lease. This could result in the landlord evicting both you and your subtenant.