Is a survey required before building a fence in New Hampshire?

No state law in New Hampshire requires a survey before building a fence. However, most NH towns require fences to be set back from property lines, and many NH properties have unclear or unconfirmed boundaries due to colonial-era deed descriptions and historic stone walls. Building a fence without knowing where the line is creates real legal and financial exposure if the fence turns out to encroach on your neighbor's property.

What is NH RSA 473 and how does it affect fences?

RSA 473 is New Hampshire's fence statute. It governs line fences (fences built along a shared property boundary) and establishes that adjoining landowners share responsibility for maintaining a common fence unless they agree otherwise. RSA 473:14 addresses disputes about line fence location. The statute does not require a survey before building, but it does make clear that the fence must be on or near the actual property line, not just where the parties assume the line is.

Are stone walls always boundary lines in New Hampshire?

Not necessarily. Stone walls in New Hampshire are historically associated with property boundaries because colonial farmers built them along lot lines as they cleared fields. But walls shift, get rebuilt, and sometimes run through the middle of a parcel rather than along its edge. A stone wall is strong evidence of a historic boundary, not legal proof of the current one. A licensed LLS can tell you whether the wall in question is the legal boundary for your lot.

What is a spite fence in New Hampshire?

A spite fence is a fence built primarily to annoy or harm a neighbor rather than for any legitimate purpose. NH RSA 476:1 addresses nuisance structures and provides a legal basis to challenge a fence built maliciously. Courts look at the fence's height, construction, and purpose when evaluating these claims. Knowing your actual property line before you build prevents disputes from escalating to this level.

How much does a boundary survey cost before building a fence in New Hampshire?

A residential boundary survey in New Hampshire costs $600 to $2,000 depending on location, lot complexity, and the state of the deed chain. In southern NH suburbs, a straightforward survey often runs $600 to $1,200. That cost is almost always less than the cost of removing and rebuilding a fence that encroaches on a neighbor's land, or defending a property line dispute in court.

Do I Need a Survey to Build a Fence in New Hampshire?

Quick answer

New Hampshire has no law requiring a survey before fencing, but unclear lot lines and stone walls make one worth getting. Here is what to know.

No State Law Requires a Survey Before Fencing

New Hampshire has no statute requiring a property owner to commission a survey before building a fence. The decision is yours. But given how NH properties are described, how many lots have never been formally surveyed, and how often stone walls create false confidence about where a line actually is, getting a survey before you pour concrete for fence posts is almost always the smarter move.

What NH RSA 473 Says About Fences

NH RSA 473 is the state's fence statute. It governs line fences, which are fences built on or near a property boundary between two adjacent owners. The law establishes that adjoining landowners share responsibility for a common line fence unless they have a written agreement that says otherwise. RSA 473:14 provides a process for resolving disputes about the location of a line fence when neighbors disagree.

The statute presupposes that there is a property line to build the fence on. It does not tell you how to find that line. If you build a fence where you think the line is and a survey later shows the line is two feet further onto your neighbor's property, you own a fence in the wrong place. Removing it, rebuilding it, and potentially compensating your neighbor for use of their land costs far more than a survey would have.

New Hampshire Towns Set Their Own Setback Rules

Even if you know exactly where your property line is, most New Hampshire towns require fences to be set back a specific distance from that line before you build. Common setbacks run from six inches to two feet, though the exact number varies by town, fence height, and fence type. Some towns distinguish between front yard and rear yard setbacks. A fence that crosses onto a neighbor's lot is an encroachment; a fence that violates your own town's setback is a zoning violation.

Check your town's zoning ordinance or call the building department before installing any fence, regardless of whether you plan to survey first. Some towns also require a permit for fences over a certain height.

The Stone Wall Problem in New Hampshire

New Hampshire has more stone walls per acre than almost any other state. Colonial-era farmers built them to clear fields and mark lines, and many of those walls have stood for 200 years or more. Because of this history, many NH property owners assume that a stone wall running through the back of their lot is the legal boundary. That assumption is often correct. But not always.

Stone walls move. Farmers rebuilt them to improve fields or accommodate new layouts. Some walls were built as internal dividers within a single parcel rather than along a lot line. Other walls were partially demolished to create openings for gates and driveways, and the remaining sections no longer mark a continuous boundary. And because many NH deed descriptions reference these walls using language like “along the stone wall southerly to the corner of the lot,” ambiguities arise when the wall and the deed description do not align perfectly with each other or with the surrounding lots.

A licensed LLS can tell you definitively whether the stone wall on your property is the legal boundary. That determination requires correlating the physical wall with the deed description, checking prior recorded plans at the county Registry of Deeds, and looking at the surrounding lot fabric to see whether the wall is consistent with the neighborhood's historic lot layout. If you are planning to build a fence along a stone wall that you assume is the line, a survey before construction is the only way to confirm your assumption.

What Could Go Wrong Without a Survey

The most common outcome of fencing without a survey is an encroachment dispute. Your neighbor notices that the fence runs through what they believe is their yard, raises the issue, and you are faced with a choice: remove and rebuild the fence, hire a surveyor anyway to resolve the dispute, or hire an attorney. Any of those paths is more expensive and more stressful than the original survey would have been.

A more serious outcome is adverse possession. New Hampshire law, like most states, allows a person who openly occupies and uses another's land for a continuous period (20 years in NH) to acquire title to that land. A fence that sits two feet into your neighbor's yard for decades can eventually create a legal claim. By the same token, a neighbor's fence that has encroached on your land for years may generate a claim against you if you fail to object. Knowing where your line is, and having a recorded plan that documents it, is the only reliable protection against these scenarios.

When a Survey Matters Most Before Fencing in New Hampshire

No survey has ever been done on your lot: Many NH properties, particularly in rural towns and older neighborhoods, have never had a formal boundary survey. The last documentation in the Registry may be a deed from the 1940s with a metes and bounds description referencing physical objects that no longer exist. If this describes your property, you do not actually know where your lines are.
Your deed references a stone wall: If your deed says something like “along the wall to a point,” a surveyor needs to determine whether that wall is still in place, where it sits precisely, and whether the deed reference matches the physical evidence.
You are close to a neighbor's structure: If you plan to fence along a line where a neighbor's shed, garden, driveway, or structure is already close to where you think the boundary is, confirm the line before you build.
You are in a densely settled town with small lots: In towns like Manchester, Nashua, Portsmouth, or Keene, lot lines can be a matter of a few inches in some older neighborhoods. Fence placement errors are more consequential when every foot of setback matters.
You are near the Lakes Region or seacoast: Waterfront and coastal lots often have irregular boundaries, tidal line considerations, and higher property values. The cost of a survey is small relative to the value at stake and the complexity of the boundary description.

The Cost of a Survey Versus the Cost of Getting It Wrong

A residential boundary survey in New Hampshire costs $600 to $2,000 depending on location and lot complexity. A neighbor dispute that reaches the level of legal action can cost $5,000 to $20,000 in attorney's fees alone, before any judgment or settlement. Removing and rebuilding a fence that crosses a property line adds $1,000 to $4,000 or more depending on the fence type and length. The survey is the cheaper option in almost every realistic scenario.

Find a Licensed Surveyor in New Hampshire

Every surveyor in our New Hampshire directory is sourced from state licensing records. Browse the New Hampshire directory to find licensed LLS firms in your area, compare their experience with NH's colonial deed system, and request quotes before you start any fence project.