This article discusses doctrines dealing with encroachments. An encroachment may be protected by showing that it is permanent and has existed for more than three years; however, there are cases to the contrary. Adverse possession or prescriptive easement theoriues can also be used if the property was possessed for at least five years and other standards are met. Additiionally agreed boundaries and good faith improvements doctrines may apply.
Bernhardt, Roger, "Lawyers and Lot Lines" (2004). Publications. 323.