Louisiana Has One of the Most Complex Property Systems in the Country
Louisiana is the only state that operates under civil law rather than common law, a legacy of French and Spanish colonial rule. That history shapes everything about how property is described, transferred, and surveyed here. Before you can know where your property lines are, it helps to understand the system they come from.
In southern Louisiana, most lots were laid out using the French long-lot system: narrow strips of land running back from a bayou or river, measured in arpents. One arpent is roughly 192 feet. A deed might describe a lot as four arpents of front by forty arpents in depth, which is a precise description but one that requires translation into modern survey coordinates before anyone can put a stake in the ground.
In northern Louisiana, the land was surveyed under the Public Land Survey System (PLSS), the same rectangular township-and-range grid used across most of the American Midwest and West. The two systems meet somewhere in the middle of the state, which means Louisiana surveyors often need to work across both frameworks.
Property in Louisiana is transferred through a notarial act, sometimes called an act of sale, prepared by a notary who in Louisiana is typically a licensed attorney. That document contains the legal description of the property. It is the starting point for any boundary research.
When You Need to Know Where Your Lines Are
Most Louisiana property owners only think about their boundaries when something forces the question. Common triggers include a neighbor who wants to build a fence along a line that does not match where you thought it was, a contractor who needs setback clearance before pulling a permit, a lender requiring a current survey before refinancing, or an estate being divided among heirs.
In each of these situations, online maps and plat copies are not sufficient. A parish parcel viewer gives you a picture of your lot's approximate shape, not a legally defensible boundary.
What a Licensed Surveyor Does to Find Your Lines
When you hire a Louisiana Professional Land Surveyor (PLS), your surveyor starts in the records. They pull your notarial act, any prior surveys on file, and the deeds for adjacent properties. In the southern parishes, that research may go back to original Spanish or French land grants. Your surveyor checks the Louisiana Atlas GIS viewer and official plat records not to give you an answer, but to understand what the paper trail says before going into the field.
In the field, your surveyor looks for physical monuments: iron pipes, concrete bounds, or original survey marks. In river parishes, original arpent lots were often bounded by levee roads and back swamp features that a surveyor must reconcile with modern measurements. In northern parishes, your surveyor ties the parcel to PLSS section corners and quarter corners, which serve as the control network for all rural boundary work in the region.
At the end, your surveyor produces a signed and sealed plat that can be recorded at the parish courthouse. That plat is your legal record. It is what a title company relies on, what a court refers to in a dispute, and what gives you certainty that the fence you are about to build is in the right place.
Online Maps Are a Starting Point, Not an Answer
Louisiana parish GIS maps are useful for getting a rough sense of your lot's shape and how it relates to neighboring parcels. The Louisiana Atlas GIS viewer aggregates spatial data from across the state. These tools are built from deed records and aerial imagery, not from field surveys.
That distinction matters. A line on a GIS map is an interpretation of what a deed says. It may be accurate to within a few feet, or it may be significantly off, particularly on older lots in river parishes where colonial-era descriptions and modern coordinates do not always reconcile cleanly. For any decision that has real-world consequences, the GIS map is where the conversation starts, not where it ends.
Find a Licensed Surveyor in Louisiana
Use the directory as a starting point, then confirm the responsible surveyor's current license before hiring.