Is there any way I can indicate on my application that I will be using a cosigner? Landlords renting out an apartment or house may require tenants with poor credit to have a cosigner.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. Please submit (1) hard copy of the following information with all requested items. Please read the complete application first before attempting to fill out the. Adding a cosigner is pretty straightforward with these steps: Do your research: Treat the apartment cosigner as an additional tenant. Guarantors are usually required when a prospective tenant has bad or no credit, no rental history, or income too low to qualify. Following the application process, all qualified applicants will be notified of their status along with a lease signing and move-in schedule. The person you ask must fill out an app and go through all of the checks as well.