If you extend your yard out past your leagal owned boundary does it become yours if you maintain it for 7 years?

No, maintaining land beyond your legal boundary for seven years does not automatically grant you ownership of that land. Property laws typically require a formal process for acquiring ownership, such as adverse possession, which varies by jurisdiction and often involves specific conditions, including open and notorious use and the lack of permission from the legal owner. It's advisable to consult a legal expert to understand the laws applicable in your area.