Most homeowners don't need to inform their neighbors before constructing a fence, according to the law, but you will need to make sure that you’re building on the property line or on your side of the property line. Otherwise, the neighbor could complain, which would require you to tear down and reinstall the fence. In any case, keeping them in the loop is the neighborly thing to do! Whether you inform your neighbors or not, always use property records and a land survey to ensure your fence stays within your property boundaries.