As civilian settlements in occupied territory, both Ma'on and Havot Ma'on are illegal under international law. Here are the relevant international statutes and decisions:
Article 46 of the Hague Convention prohibits confiscation of private property in occupied territory.
Article 49, paragraph 6 of the Fourth Geneva Convention explicitly stipulates that “the occupying power shall not deport or transfer parts of its own civilian population into the territory it occupies”.
UN Security Council Resolution 465 states “Israel’s policy and practices of settling parts of its population and new immigrants” in the Occupied Territories constitutes “a serious obstruction to achieving a comprehensive, just and lasting peace in the Middle East”. The Security Council called upon Israel to “dismantle the existing settlements and in particular to cease, on an urgent basis, the establishment, construction or planning of settlements in the Arab territories occupied since 1967, including Jerusalem”.
The 2004 ruling of International Court of Justice in The Hague stated that “Israeli settlements in the Occupied Palestinian Territory, including East Jerusalem, are illegal and an obstacle to peace and to economic and social development."But it doesn't stop there. Havot Ma'on is also illegal under Israeli law. It is an unauthorized, illegal outpost that is still under orders to be demolished, but that seems unlikely to happen any time soon.