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Land surveys don’t technically expire. They do serve as a point of reference and a snapshot of your property, though, so as soon as you make changes to your property (and even if your neighbor makes certain changes to theirs), your existing land survey becomes inaccurate, and a new one must be done. Even if you don’t make any changes to your property, many states only guarantee the accuracy of a land survey for five to ten years.

Soil testers and licensed excavators are often the professionals you hire if you need a perc test. In some cases, structural engineers will also be able to conduct the test for you. In many municipalities, you’ll need your professional on-site to dig and fill the holes with water, as well as a representative from your local building department or health department. That representative is the individual who will determine whether your test passes or fails.

The small lines on the tape measure either indicate inches, fractions of an inch, or centimeters and millimeters. On the imperial unit side (aka the inches side), the longest lines indicate inches, followed by the next shortest lines that indicate a half-inch, and then the quarter, eighth, and sixteenth-inch. On the metric side, the lines break down meters, centimeters, and millimeters.

Surveys completed by licensed surveyors can be recorded with a local surveying records office, and in most cases, they will be. Filing survey reports categorize them as legal documents, and they can be used whenever legal documentation of your property’s boundaries is needed. While you’re not required to file survey documents, it’s a good idea to do so.