How to Read a Site Survey Before You Buy Land

I have bought land that made money and land that taught me lessons. The difference, more often than people admit, was visible on the survey the whole time. The survey is the cheapest document in the deal and the one buyers spend the least time reading. That is backwards.

Here is how to read one like your money depends on it, because it does.

First: know which survey you are holding

Not all surveys are the same product.

A boundary survey establishes the property lines and corners. It tells you what you own.

A topographic survey adds elevations and contours. It tells you how water moves and how much dirt work stands between you and a pad.

An ALTA survey is the institutional-grade version, tied to the title commitment, showing easements, encroachments, and improvements. If serious money is involved, this is the one lenders and buyers of income property want to see.

For a development decision, a boundary survey alone is not enough. You can own a lot and still not be able to build on it. The survey plus the title work plus the zoning is the full picture. The survey is where the physical truth lives.

The lines that matter

Property lines and corners. Confirm the corners are set and findable on the ground. If the legal description and the fence lines disagree, believe the survey and find out why the fence is where it is. Fences in the wrong place are how adverse possession claims and neighbor wars get started.

Easements. This is the big one. Utility easements, drainage easements, access easements, pipeline corridors. An easement is someone else's legal right to a piece of your land, and you generally cannot build over it. I have seen lots where the buildable area shrank by a third once the easements were drawn. The listing said half an acre. The easements said otherwise.

Setbacks. Front, side, and rear setbacks come from zoning, and a good survey or site plan will show them. Setbacks plus easements define the true buildable envelope. Draw that envelope before you fall in love with the lot. Sometimes the envelope will not hold the product you planned, and no price fixes that.

Encroachments. The neighbor's driveway, shed, or sprinkler system on your side of the line. Or yours on theirs. Encroachments are solvable, but you want them solved in the purchase agreement, not discovered after closing.

Reading the ground itself

On a topographic survey, the contour lines are the story. Tight lines mean slope. Slope means retaining, stepped foundations, or export and import of dirt. Every foot of grade is money.

Look for where water enters and leaves the site. Low spots with no outlet become ponds, and not the kind that add value. If the lot sits lower than the road and the neighbors, you are the drain. In Southeast Michigan, where clay soil holds water like a grudge, drainage is not a detail. It is the design.

Check for regulated features: wetlands flags, floodplain lines, county drains. A county drain easement across a parcel changes what you can do with it, and wetlands can take chunks of land off the table entirely. These show up small on paper and enormous in the budget.

The details buyers skip

Benchmarks and datum. Elevations only mean something relative to a benchmark. Confirm the survey datum matches what the engineer and the township use, or your site plan will fight the as-builts later.

Date of the survey. A survey is a snapshot. If it is ten years old, the ground may have changed, and the easements certainly might have. For a purchase, get a current one.

Surveyor's notes and exceptions. The fine print where the surveyor tells you what he could not verify. Read it. It is a map of your unknowns.

How this connects to the money

Every dollar of sitework risk shows up first on the survey. The slope becomes the grading budget. The easement becomes the site plan revision. The wet corner becomes the drainage system. When I underwrite land, the survey and the topo drive the site budget before any contractor walks the property. Clearing costs, for example, are a direct function of what the survey and a site walk tell you.

Buy the lot the survey shows you, not the lot the listing describes. The listing is marketing. The survey is testimony.

The five-minute discipline

Before going hard on any land deal:

1. Confirm survey type and date. Order current if stale.
2. Trace every easement and draw the buildable envelope with setbacks.
3. Read contours for slope and water. Find the outlet.
4. Flag encroachments and regulated features.
5. Read the surveyor's notes twice.

Five minutes with a highlighter has saved me more money than any negotiation tactic I know.