Make sure your contract allows subletting and get permission from your landlord. What would you put in a roommate agreement with an illegal sublet?(Yes it's not ideal, but there are extenuating circumstances on both sides). Subletting your rental? Easily create a Residential Sublease Agreement. Your renting agreement with your landlord is either a tenancy or a licence. Most private renters have assured shorthold tenancies. C. Pursuant to the terms of the Lease, Tenant must obtain the prior written consent of Landlord to any sublease of all or any portion of the Premises. This guide is for people who are renting a home privately under an assured shorthold tenancy, either direct from a landlord or through a letting agency. Here are a few important steps to take to finish your document.