How to Find Your Property Lines Yourself (It's Not a Survey)

What this guide is and isn’t

This is how to locate the monuments a surveyor already set and understand where your line most likely runs, using the public record and a few tools. It’s the right amount of effort for deciding where a shed or a garden goes, understanding an easement, or getting a head start before a surveyor comes.

It’s not a survey, and it can’t become one. No permit office, lender, title company or court accepts a homeowner’s string line, and setting or moving a monument without a license is illegal in every state. The moment a project touches the property line — a fence, a wall, a structure, a sale, a disagreement — hire a surveyor.

Tools

• The plat and deed from the county — the only thing here that’s essential
• Metal detector — rent one for $30 a day, borrow one, or buy a basic model for about $90. It turns a possible afternoon of digging into ten minutes per corner
• 300-ft open-reel tape ($25) for checking distances
• Probe — a long screwdriver or a length of rebar — and a trowel or shovel
• Stakes, flags and mason’s string ($25)
• Compass or a compass app, for orienting the plat

What “found the pin” does and doesn’t mean

A pin is evidence, not proof. Surveyors find pins that were set wrong, pins that a fence crew pulled and re-stuck, and pins from an older survey that a newer one superseded. That’s why step 4 matters: measuring between two pins and matching the plat is the one check you can do that a wrong pin usually fails. If it fails, you’ve learned something important, and the answer is a professional.

Step by step

1. Get the plat and deed

   Search your county recorder's or GIS website for your parcel, or visit the office. You want the recorded plat of your subdivision (a drawing of the lots with dimensions and bearings) and your deed's legal description. Many counties provide both free online. Print the plat large enough to read the numbers.

2. Read the plat

   Find your lot. Each line has a distance (e.g. 120.00') and usually a bearing (e.g. N 89°30' E). Corners are marked with a symbol and a note like 'IRF' (iron rod found) or 'IRS' (iron rod set), often with the size. Count the corners and note the distances between them — this is your checklist.

3. Find the first pin

   Front corners are easiest: they're near the sidewalk or road edge, and a neighbor's fence post is often sitting on one. Sweep a metal detector in a circle out to about 3 ft from where the plat suggests. When it signals, probe with a screwdriver, then dig gently with a trowel. Expect a rod or capped rebar 1–12 inches down.

4. Find a second pin and measure between them

   Repeat at the adjacent corner. Stretch a tape between the two pins and compare the distance to the plat. If it agrees within a few inches, both are likely genuine corners. If it's off by a foot or more, one of them is disturbed, misidentified or not yours — that's the point to stop and call a surveyor.

5. Find the remaining corners

   Use the two verified pins and the plat distances to predict where the others are: measure along the line, sweep the detector around the predicted point. Back corners are harder — buried deeper, under fences or landscaping, or missing entirely. Fence corners are a clue, not proof; fences are routinely off the line.

6. Mark and string the lines

   Set a wooden stake or flag beside each pin (not on it) and run mason's string between them. Now you can see the line. Don't pull, straighten, hammer or 'improve' a pin. Moving a monument is illegal in most states and destroys evidence a surveyor would need later.

7. Check for easements

   Plats show easements as dashed lines with a width — utility, drainage, access. Anything built in an easement can be removed by the utility at your expense. Note where they run before you plan anything.

8. Decide if this is enough

   If you found every pin, the distances match the plat, nothing's in dispute, and your project sits well inside the line, you're done — plan away. If any corner is missing, any distance is off, the plat and the fences disagree, or you're building near the line, order a boundary survey. The pin locations you found will save the surveyor time, and sometimes money.

What would this cost you? The land survey calculator prices the DIY version with the tools you already own and a value on your time, next to a pro quote.