My dad has agreed to cosign a lease with me but I am afraid my application will just be thrown out since I cannot provide a credit score or any proof of income. Learn the essential steps on how to add a cosigner to a lease to strengthen your rental agreement.Cosigners will be considered in some situations. A cosigner for an apartment takes on the financial responsibility for a lease. Learn how having a cosigner can help someone get approved for an apartment. Should you allow a cosigner on a lease? This article covers when landlords should consider a cosigner and what the risks are. This guide will provide all the necessary information you need to screen, process, and add a cosigner to a lease. When do I need a cosigner? This article provides information about the rights and responsibilities of Landlords and Tenants for apartment and home rentals.