Squatters' rights—sometimes called adverse possession—vary dramatically across jurisdictions. In common‑law countries such as the United Kingdom and the United States, statutes specify a minimum period of uninterrupted possession before a claim can be asserted. Civil‑law nations like Germany or Brazil codify similar concepts but often attach stricter requirements, such as proof of good faith or registration with local authorities. These baseline rules provide the factual scaffolding for any comparative analysis.

Beyond statutes, historical precedents and policy debates shape how societies balance property security against social housing pressures. Post‑war Europe, for example, saw a surge in informal occupation that prompted legislative reforms aimed at reducing homelessness while protecting owners. Recognizing these broader forces helps distinguish what is legally enforceable today from what stems from evolving social agendas.