How Do I Find My Property Lines Before Installing a Fence?

Installing a new fence can add privacy, security, and usable space to your yard. But before deciding where the fence should go, there’s one important question to answer:

Where exactly is your property line?

It may sound simple, but property boundaries aren’t always as obvious as they appear. Mow lines, landscaping, old fences, and even online property maps can give homeowners a false sense of where their property begins and ends.

Before installing a fence, here are several ways to determine where your property line is, and when it may be time to call a professional surveyor.

Start by Looking for Property Pins

One of the first things we look for when determining a fence location is the property pins.

Property pins are markers placed at or near property corners when a lot is surveyed or platted. Depending on the age of the property, they may be pieces of rebar, metal pipe, or another type of metal marker buried in the ground. Some have colored plastic caps, although those caps can disappear over time.

Even in neighborhoods that have been around for decades, these markers may still be there.

Because they can become buried under soil and landscaping, a metal detector can be extremely helpful when searching for them.

If you can find the property pins, they can provide important reference points for determining where the fence should be placed.

What If You Can’t Find the Property Pins?

Unfortunately, property pins don’t always survive.

They may have been disturbed or removed during utility installation, final grading, landscaping, or other construction. This is particularly possible around areas where electrical, internet, or other utility work has taken place.

If the pins aren’t immediately visible, don’t assume they’re gone. A site plan or other property measurements can help narrow down where you should search with a metal detector.

For example, if you locate one corner and your records indicate that the next corner should be 82 feet away, you can measure approximately 82 feet and concentrate your search in that area.

Check Your Site Plan

Another useful resource is your property’s site plan.

For newer construction, the site plan may show the house, lot dimensions, setbacks, and measurements between the house and property lines. If you don’t have a copy, your city or local jurisdiction may have one on file from when construction plans were originally submitted.

Suppose the site plan shows that one side of your house is 7½ feet from the property line. That measurement can give you a useful starting point for locating the boundary or finding a missing property pin.

There is an important limitation, however.

Those measurements assume the house was built exactly where the plans indicated. Construction doesn’t always happen perfectly. Foundations and buildings can occasionally be positioned differently than originally planned.

For that reason, site-plan measurements can be useful evidence, but they shouldn’t automatically be treated as the same thing as a professional boundary survey.

Use Assessor Information Carefully

Your local assessor’s website may also contain useful information about the property, including lot dimensions.

Those measurements can be helpful. The aerial property-line overlay, however, is a different matter.

Don’t assume the lines drawn over an aerial photograph show the precise legal boundary of your property.

Those lines are computer overlays, and their position relative to objects visible in the photograph can be inaccurate. In our experience, we’ve seen aerial overlays appear several feet, and sometimes considerably more; away from the actual boundary.

Instead, look for recorded dimensions. If the assessor information indicates that one property line is 62.7 feet long, for example, that measurement may help you narrow your search for the corner markers.

Think of the online map as a reference, not a substitute for locating the actual boundary.

Your Mow Line Is Not Your Property Line

Another common assumption sounds something like this: “We’ve been mowing to this line for 15 years, so this must be our property line.”

Unfortunately, that’s not how property boundaries are established.

The same applies to landscaping, trees, sheds, old fences, and other features that have simply existed in a particular location for a long time. They may provide clues, but their location alone doesn’t establish the legal boundary.

We’ve encountered situations where a fence was installed where a homeowner believed the property line was, only for a neighbor to later hire a surveyor. The survey showed the fence was just a couple of inches over the line.

The fence then had to be moved.

A few inches may not sound significant during installation. They can become very significant once posts are set and an entire fence has been constructed.

Can You and Your Neighbor Agree on the Fence Location?

Depending on your circumstances and local requirements, talking with your neighbor may also be part of the process.

If you have a good relationship and both understand the proposed fence location, an agreement can sometimes help resolve practical questions about placement.

But there are important limitations. A neighbor agreement doesn’t eliminate applicable permit requirements, easements, public rights-of-way, setback requirements, or other local rules. And an informal agreement about where to put a fence is not necessarily the same thing as legally establishing a property boundary.

When the exact legal boundary matters, a professional survey remains the more reliable option.

When Should You Hire a Surveyor?

If the property pins are missing, the available measurements don’t provide enough certainty, or there is disagreement between neighbors, it may be time to contact a licensed land surveyor.

Older neighborhoods can present additional challenges because original markers may be difficult or impossible to locate. Surveyors can research property records, examine existing monuments and other evidence, take measurements, and determine the boundary using professional surveying methods.

A full boundary or retracement survey can be expensive. In recent projects survey costs were around $1,800 to $2,200, although pricing varies considerably by property, location, survey type, research required, and surveying company.

That expense is one reason it makes sense to look for existing property pins and documentation first.

But when the location is genuinely uncertain, especially when neighbors disagree, the cost of establishing the boundary correctly can be preferable to installing a fence in the wrong location and paying to move it later.

A Practical Order of Operations

1. Look for existing property pins, including using a metal detector.
2. Review your site plan and recorded lot dimensions to help locate missing markers.
3. Use assessor information as a reference, but don’t rely on an aerial overlay as proof of the boundary.
4. Discuss the proposed fence location with your neighbor when appropriate.
5. Check local fence, permit, setback, easement, and right-of-way requirements.
6. Hire a licensed surveyor when the boundary cannot be established with sufficient confidence.

Do You Need a Survey Before Installing a Fence?

Not necessarily.

If your property pins can be confidently located and the fence location is clear, you may already have the information needed to plan the project, subject to your local requirements.

But when the markers are missing, records conflict, or there’s uncertainty about the boundary, guessing can create an expensive problem.

The goal isn’t simply to put the fence where the yard looks like it ends. It’s to understand where the property boundary actually is before construction begins.

Planning a new fence? Start by locating your property pins and gathering any available site plans or property measurements. Taking a little extra time before installation can help prevent boundary disputes, and the much larger expense of moving a finished fence later.

Watch this video for more tips!