Buying and building
Do I need a survey to build a fence?
Short answer: probably, and it is the cheapest insurance in this whole business.
A fence is the single most common trigger for a boundary dispute. It is a permanent, visible assertion of where you believe your land ends, and it sits there for decades being treated as the line by everyone who sees it.
The arithmetic
A boundary survey on a normal residential lot is a moderate one time cost. Taking down and rebuilding a fence that turned out to be over the line costs the full price of the fence again, plus removal, plus whatever the relationship with the neighbor was worth.
And that is the good outcome. The bad outcome involves attorneys.
When you can probably skip it
- Corner monuments are present, findable, and clearly identified
- You have a recent boundary survey and nothing has changed
- You are building well inside your line, not near it
- You are replacing an existing fence in exactly the same position and the neighbor agrees it is correct
That last one deserves care. “It has always been there” is not the same as “it is on the line.”
When you genuinely need one
- You cannot find the corner markers
- You are working from a plat, a mortgage inspection or the county GIS map
- The neighbor has expressed any doubt about the line
- The property is rural, irregular or has never been surveyed to your knowledge
- An existing fence looks like it might be in the wrong place
- Your city requires a survey for the fence permit
County GIS maps are not surveys. The parcel lines you see on an assessor’s online map are drawn for tax administration at a scale where a few feet of error is irrelevant to their purpose. They are useful for orientation and useless for placing a fence.
Build inside your line, not on it
Even with a survey in hand, many people set the fence a few inches inside their boundary rather than exactly on it. Posts have width, installers make small errors, and a fence that is unambiguously on your own ground is a fence nobody argues about. Check your city code and any HOA rules, since some specify placement.
Talk to the neighbor first
Tell them you are having the line surveyed and why. Offer to share the cost, since the result serves both of you. Show them the result before you build. Almost every fence dispute that turns bad started with somebody discovering a survey crew or a post hole digger in their yard without warning.
Also check before you dig
Call 811 for utility locates before setting posts. That is free, legally expected, and separate from the survey. A surveyor marks your boundary. They do not mark the gas line.