A Nor Sor 3 describes the land by reference to its neighbours instead of fixed survey points, so the stated area and the boundaries are approximate. That makes boundary disputes more likely than with a Nor Sor 3 Gor or a chanote. Any change of rights must be advertised for 30 days before the land office will register it, so that anyone with a competing claim can object.

The holder can apply to have the plot surveyed and upgraded. Whether that succeeds depends on the survey, on the neighbours and on whether the land falls inside a forest reserve, national park or other restricted zone, a known problem with some hillside plots in resort areas.

Our view is that a foreign buyer should not pay for a lease on Nor Sor 3 land until the upgrade is complete, or should make the upgrade a condition of the contract with the deposit refundable if it fails. Take independent legal advice. More in title deeds and due diligence.