Acquiescence & Practical Location

Overview#

Not all boundaries are determined solely by the written deed and the monuments set by the original surveyor. Over time, the acts of adjoining landowners -- where they build fences, plant crops, maintain lawns, and occupy the land -- can create, confirm, or even override the boundaries described in the record. These doctrines of unwritten boundary determination are among the most complex and consequential topics in boundary law.

The boundary surveyor who considers only the record description and physical monuments, while ignoring decades of occupation and use, may produce a technically defensible survey that is legally wrong. The law recognizes that in many cases, the practical reality of how people have used and occupied land is better evidence of the true boundary than a century-old deed description.

"A person may gain or lose land rights or modify boundary lines without writings." -- Robillard & Wilson, Evidence and Procedures for Boundary Location (6th Ed.), Ch. 13, Sec. 13-2

This article covers the primary doctrines of unwritten boundary determination: acquiescence, practical location, boundary by agreement, and boundary by estoppel. Each represents a different legal theory, but all share a common thread -- the conduct of the parties, sustained over time, can fix a boundary line that the written record alone cannot.

Boundary by Acquiescence#

Definition

Boundary by acquiescence occurs when adjoining landowners mutually recognize and accept a line as their common boundary for a sufficient period of time, and that acceptance is evidenced by their conduct -- typically by building and maintaining a fence, hedge, wall, or other demarcation along the accepted line.

The doctrine does not require an explicit agreement. It is based on the inference that when two neighbors treat a line as the boundary for many years without dispute, they have implicitly agreed to it. The silence and passive acceptance of both parties, combined with conduct consistent with the accepted line, creates the acquiescence.

Required Elements

The specific elements required for boundary by acquiescence vary by jurisdiction, but most courts require some combination of the following:

Duration Requirements

The required duration of acquiescence varies significantly by jurisdiction. Some states require a specific statutory period (often the same as the statute of limitations for adverse possession). Others require only a "long period" without specifying a number of years.

Distinction from Adverse Possession

Acquiescence is fundamentally different from adverse possession, even though both involve long-standing occupation and both may require the same duration period. The key distinction is hostility:

• Adverse possession requires hostile occupation -- the possessor must hold the land against the rights of the true owner, without permission.
• Acquiescence requires mutual recognition -- both parties accept the line. There is no hostility; there is agreement, even if unspoken.

A fence maintained for 20 years along a line 10 feet inside your neighbor's record boundary could support either claim, depending on the circumstances. If both neighbors treated the fence as the boundary, it is acquiescence. If only the encroaching neighbor treated it as the boundary while the other was unaware, it might be adverse possession.

The Requirement of Uncertainty

Many jurisdictions require that the true boundary must have been uncertain or disputed at the time the acquiescence began. If both parties knew exactly where the record boundary was and simply chose to treat a different line as the boundary, the doctrine of acquiescence may not apply -- the parties would need a written agreement to alter a known boundary, consistent with the Statute of Frauds.

This requirement protects against the casual acceptance of a convenience fence being transformed, through the mere passage of time, into a permanent alteration of property rights. The uncertainty requirement ensures that acquiescence applies only where the true boundary was genuinely in doubt.

However, some jurisdictions have relaxed or eliminated the uncertainty requirement, holding that long acquiescence in any recognized line -- whether the true boundary was known or not -- establishes the boundary. The surveyor must be aware of the specific rule in the applicable jurisdiction.

Evidence of Acquiescence

The surveyor should look for the following evidence when acquiescence may be an issue:

• Age and condition of fences -- old, well-maintained fences suggest long-standing recognition
• Consistency of use -- both parties treating the fence as the boundary (not just as a property improvement)
• Improvements built in reliance -- structures, driveways, or gardens placed with reference to the fence line
• Tax payments -- in some jurisdictions, which party paid taxes on the disputed strip is relevant
• Testimony of prior owners -- statements about the understood boundary
• Prior surveys -- surveys that show or reference the fence line as the boundary

Practical Location#

Definition

Practical location is the doctrine that a boundary line, once located on the ground by a surveyor or the parties and then accepted and acted upon, becomes the true boundary -- even if a subsequent, more accurate survey shows it to be in a different position from the record description.

The doctrine protects the stability of land titles and the expectations of landowners who have built improvements, occupied land, and conducted their affairs in reliance on a particular boundary location.

"The question is not how an entirely accurate survey would locate these lots, but how the original stakes located them. . . . As between old boundary fences, and any survey made after the monuments have disappeared, the fences are by far the better evidence of what the lines of a lot actually are." -- Diehl v. Zanger, 39 Mich. 601 (1878)

How Practical Location Differs from Acquiescence

While acquiescence is based on the passive conduct of the parties over time, practical location is based on a specific act of location -- a survey, a fence placement, a staking of the line -- followed by acceptance and reliance. The distinction is temporal: practical location can be established more quickly because it is founded on an affirmative act, not merely the passage of time.

Elements of Practical Location

1. A survey or physical location of the line by a surveyor or the parties
2. Knowledge and acceptance of the located line by the adjoining owners
3. Conduct consistent with the location -- building improvements, fencing, occupying up to the line
4. Passage of time -- sufficient for the parties to have relied upon the location

Boundary by Agreement#

Definition

Boundary by agreement occurs when adjoining landowners explicitly agree on the location of their common boundary. The agreement may be oral or written. When written, it typically takes the form of an agreement deed or a stipulation in a court proceeding.

Oral Agreements

Oral boundary agreements present a tension with the Statute of Frauds, which generally requires transfers of interests in land to be in writing. However, most courts hold that an oral boundary agreement does not violate the Statute of Frauds because the parties are not transferring land -- they are merely locating the boundary of land already conveyed.

"Adjoining owners verbally agreeing on the location of an unknown disputed line are usually bound, by law, to the agreement. In the eyes of the court, they are not transferring land but are merely agreeing on the disputed location of that which is already owned and is uncertain." -- Robillard & Wilson, Evidence and Procedures for Boundary Location (6th Ed.), Ch. 13, Sec. 13-2

For an oral boundary agreement to be enforceable, most jurisdictions require:

1. Uncertainty or dispute about the true boundary location
2. A bona fide agreement between the adjoining owners
3. Subsequent possession consistent with the agreed line
4. Reliance -- often manifested by building improvements or fencing along the agreed line

Not all jurisdictions honor oral boundary agreements. Some states require all boundary agreements to be in writing to be effective. The surveyor should be aware of the law in the specific jurisdiction.

Written Agreements

A written boundary agreement (agreement deed) removes the Statute of Frauds concern entirely. It is a document signed by both parties that establishes the location of their common boundary. Unlike an oral agreement, which merely fixes an uncertain line, a written agreement deed can intentionally relocate a known line. The legal effect is a mutual conveyance -- each party conveys to the other whatever interest they may have on the opposite side of the agreed line.

Boundary by Estoppel#

Definition

Boundary by estoppel occurs when one landowner, by words or conduct, induces an adjoining landowner to believe that a particular line is the boundary, and the adjoining landowner relies on that representation to his or her detriment. The first landowner is then "estopped" (prevented) from claiming a different boundary.

Required Elements

Example

Landowner A tells Landowner B, "The boundary between our lots is this fence line." Relying on that statement, B builds a garage abutting the fence. A later survey reveals the true boundary is 8 feet on B's side of the fence -- meaning B's garage encroaches. A is estopped from claiming the true boundary because B relied on A's representation and built improvements in reliance.

Estoppel differs from acquiescence in that it requires an affirmative representation (not merely passive conduct) and detrimental reliance. It can be established in a relatively short time -- there is no requirement for a statutory period.

The Role of Occupation and Use#

Evidence of long-standing occupation and use is relevant to virtually every unwritten boundary doctrine. The surveyor should look for and document:

• Fence lines -- the most common physical evidence of a recognized boundary
• Hedgerows and tree lines -- may mark boundaries that predate modern fencing
• Mowed areas vs. unmowed -- the line where regular maintenance stops
• Building setbacks -- structures placed in relation to a perceived boundary
• Gardens, driveways, and outbuildings -- placed based on the owner's understanding of the boundary
• Utility connections -- wells, septic systems, and utility lines placed in reference to a boundary
• Clearing and grading -- land improvement up to a perceived boundary

This physical evidence does not, by itself, establish a boundary. But it is the raw material from which the doctrines of acquiescence, practical location, agreement, and estoppel are built.

Fence Lines as Evidence#

Fence lines deserve special attention because they are the most common and most contested form of occupation evidence. A fence line may be:

1. Evidence of the true boundary -- placed by the original surveyor or in direct reference to the original survey
2. Evidence of acquiescence -- accepted by both parties as the boundary for a long time
3. Evidence of agreement -- built pursuant to an agreement between the parties
4. A convenience fence -- placed for agricultural or privacy purposes with no boundary significance

The critical question is why the fence was built and how it has been treated. A fence built on the surveyed boundary line is evidence of the boundary. A fence built for livestock containment, even if not on the boundary, may acquire boundary significance through decades of acquiescence.

"In case of a disputed boundary line in a town, city or village, where the monuments from which the town, city or village was platted are lost or destroyed, the courts ought not to disturb boundary lines between lot owners which have been acquiesced in for years and upon which the lot owners have erected improvements." -- Diehl v. Zanger, 39 Mich. 601 (1878)

Effect on the Record Description#

When a boundary is established by acquiescence, agreement, or practical location, the effect on the record description depends on the theory applied:

In all cases, the record description in the recorder's office is not physically changed. The unwritten determination exists as an overlay on the written record. This creates challenges for title companies, subsequent purchasers, and surveyors who may not be aware of the unwritten boundary.

Burden of Proof#

The party claiming an unwritten boundary bears the burden of proof. This means they must prove each element of the applicable doctrine by a preponderance of the evidence (or, in some jurisdictions, by clear and convincing evidence).

The surveyor's role is not to determine whether the burden has been met -- that is a legal determination for the court. The surveyor's role is to:

1. Identify and document the occupation evidence
2. Report the findings to the client and, if applicable, to the court
3. Note discrepancies between the record description and the occupation evidence
4. Refrain from making legal conclusions about which doctrine applies

A survey that shows a fence line 10 feet from the record boundary, occupied by the neighbor for 30 years, with a house built 5 feet from the fence, should report all of those facts. The surveyor should not conclude that the fence "is" or "is not" the boundary -- that is a legal determination.

The Surveyor's Dilemma#

The interaction between written and unwritten boundaries creates one of the most challenging aspects of boundary surveying. The surveyor who shows only the record boundary may be misleading the client about the practical reality of ownership. The surveyor who shows an acquiesced or agreed boundary may be making a legal determination beyond the surveyor's authority.

The best practice is transparency: show the record boundary, show the occupation evidence, note the discrepancy, and advise the client to consult legal counsel if the discrepancy may be significant.

Key Takeaways#

• Acquiescence establishes a boundary through the mutual, passive recognition of a line over a sufficient period -- typically the statutory period for adverse possession.
• Practical location fixes a boundary based on a specific act of location (survey or fencing) followed by acceptance and reliance.
• Boundary by agreement results from an explicit agreement between adjoining owners, which may be oral (in most jurisdictions) or written.
• Boundary by estoppel prevents a party from denying a boundary when their representation induced detrimental reliance by an adjoining owner.
• Fence lines are the most common evidence of unwritten boundaries, but their significance depends on why they were built and how they have been treated.
• The burden of proof for any unwritten boundary claim falls on the party asserting it.
• The surveyor should document all occupation evidence but should not make legal conclusions about whether an unwritten boundary has been established.
• Unwritten boundaries do not change the recorded deed -- they create an overlay that may affect ownership despite what the records show.

References#

1. Robillard, W.G. & Wilson, D.A. Brown's Boundary Control and Legal Principles (7th Ed.). John Wiley & Sons, 2014. Chapters 3, 12.
2. Robillard, W.G. & Wilson, D.A. Evidence and Procedures for Boundary Location (6th Ed.). John Wiley & Sons, 2011. Chapter 13.
3. Diehl v. Zanger, 39 Mich. 601 (1878).
4. Clark, F.E. Law of Surveying and Boundaries (6th Ed.). Lexis Law Publishing, 1999.
5. Skelton, R.P. & Demers, M.N. "Boundary by Acquiescence and Related Doctrines." Surveying and Land Information Science, Vol. 63, No. 2, 2003.