If your thinking of buying property then building later be very cautious and aware of squatters and their rights…
People who move onto a piece of property which they do not own, live there for a year and who improve the property by working the land and/or constructing a dwelling, may have a legal right to live there since they may have acquired a “right of possession”. Once acquired, this right of possession can be sold to others.
If a large piece of property is purchased it is essential that a watchman be hired to report any squatters to the police before they become settled. An employee hired to guard a property cannot become a squatter, but an employment agreement with the watchman is a good idea.