In this chapter, we will consider adverse possession (you may have heard the concept referred to as ‘squatters’ rights’) as a means of acquisition of title to an estate in land. The first consideration will be the reasons for recognising the doctrine in land law. Next, we will explore the requirements as they apply to both unregistered and registered land. Finally, the effect of adverse possession in unregistered land and registered land will be compared and the changes made by the Land Registration Act 2002 (LRA 2002) in response to difficulties in its operation explained.