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There are a couple of ways you can determine the depth of your well. One method is to use a device called a well sounder. This tool has a long measuring tape containing a sensor to alert you once the end reaches the water. 

Or you can DIY it by using a long tape measure with a half-filled bottle of water attached to it. Lower the tape measure into your well. Once you feel tension on the tape, you’ll know the bottle has reached your static water level. This will give you an approximate idea of your well’s depth.

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.

Measure from zero on a measuring tape by placing the metal hook right up against the edge of what you need to measure. You can also latch the hook onto an open edge—of, say, a table—to accurately measure as well. If you begin at the 1-inch mark, you'll need to subtract an inch from your total.

You can’t build on undeveloped land without preparing it for construction, which involves running utilities to the site or accounting for private utilities like wells and septic systems and grading and compacting the soil for safe construction. Once you prepare the land, you can build on it as long as the project abides by local zoning regulations.