I am about to move into a rental house and my dad would like me to write to the landlord asking if he will give me permission to change the locks on the front and back door. There seem to have been lots of tenants over the last few years (looks like the house had been sub-let judging from the many different names on the pile of mail on the doorstep!) and he is worried about security. Obviously, we will pay for new locks and make sure landlord has new keys but just wondering how you would feel as a landlord if you had this request? Are we being unreasonable?