Once you have lived in your home for a certain period of time you can buy further shares in your property. This process is known as staircasing, enabling you to own a greater proportion of your home.
The greater the share you buy in your home the less rent you will pay. You will be able to staircase as and when you can afford to in a minimum of 10% tranches all the way to 100%. If you staircase to 100% you become an outright owner, and pay no rent.