Landlords often ask property managers what the difference is between rental fees and lease renewal fees. Most rent-related fees are now prohibited. Find out what to do if you are charged a blocking fee. An AST is the most common type of rental if you rent from a private landlord or rental agent. Importantly, this exception does not apply to extensions or changes to the rental period. You can be charged up to £50 to change a duration of your rental or transfer it to another person. This includes the situation where you find a replacement tenant who then signs a new contract with the landlord. For too long, Londoners have been forced to pay exorating rental fees every time they move home, and even when they renew their lease. From 1.