Legal Definition of Encroachment: Extending one’s property onto that of another; a trespass, such as building a fence that intrudes upon or obstructs a public highway | Discover the legal definition of encroachment and its implications for property owners. Avoid legal disputes, maintain neighborly relations, and comply with local regulations by understanding encroachment and its examples. Take proactive steps to protect your property rights and prevent any encroachment-related issues or legal troubles