If you build a structure on land that belongs to someone else, you have committed trespass, and the property owner can sue you for money, get a court order making you tear the structure down, or both. What happens if you build on someone else’s property depends on how the mistake happened, how much land is involved, and how the affected owner responds. A builder who acted in good faith after a bad survey has more options than one who ignored a marked boundary, but no version of this story ends with an automatic right to keep what you built.
Why the Landowner Has a Claim at All
Building on land you don’t own is trespass. Trespass happens when a person enters another’s property without permission or causes an object to enter it, and the owner doesn’t need to prove any financial harm to sue. Nominal damages are recoverable on their own.1Legal Information Institute. Trespass
The word “intentional” in trespass law is narrower than it sounds. It means you intended to place the structure where you placed it. It does not mean you knew the land was someone else’s. A homeowner who builds a garage two feet over the line because of a bad survey has still committed trespass, even though the mistake was honest.1Legal Information Institute. Trespass
A permanent encroachment is what courts call a continuing trespass. Every day the structure stays gives the landowner fresh grounds to sue, so the usual statute of limitations doesn’t shut the door the way it does for a one-time entry. The clock keeps resetting until the structure is removed or the encroaching party gains rights through adverse possession or a prescriptive easement.
Money You May Have to Pay
The most immediate consequence is financial liability. The affected owner can sue for compensatory damages tied to actual losses: any drop in the property’s market value, loss of use of the encroached strip, and the costs they incurred sorting the problem out, including surveyor and attorney fees.
Consequential damages cover the less obvious financial fallout. Higher property taxes triggered by the encroachment, lost rental income, or the cost of redoing plans to work around the unauthorized structure can all be claimed. The owner has to connect each dollar to the encroachment, and the builder can challenge any figure that looks inflated or unrelated.
If the encroachment was deliberate or reckless, the court can add punitive damages on top. Those aren’t designed to make the owner whole. They exist to punish the conduct and warn others off. Getting them generally requires showing the builder acted intentionally or with willful disregard for the owner’s rights.2Legal Information Institute. Punitive Damages A builder who ignored a clearly marked property line is exposed to punitive damages in a way that a builder relying on a faulty survey is not.
Whether the Structure Has to Come Down
Money is not always what the landowner wants. Sometimes they want the structure gone, and courts can order that.
An injunction is the tool. It’s a court order that can halt construction still underway or require removal of a completed structure.3Legal Information Institute. Injunction A temporary injunction can freeze the situation while the case is decided, which matters when work is actively happening and each additional day makes the fix more expensive.
For a permanent injunction, the landowner has to show irreparable harm, that money alone wouldn’t be enough, that the balance of hardships favors the injunction, and that granting it wouldn’t hurt the public interest.4Legal Information Institute. Permanent Injunction All four matter. A court can refuse an injunction against a proven encroachment if removal would cost far more than the actual harm and the owner can be paid off instead.
Forced demolition is the sharpest form of that order, and courts don’t hand it out lightly. It’s usually reserved for cases where the encroachment is substantial, the builder acted deliberately or negligently, and no lesser remedy fixes the problem. In deciding, courts weigh how bad the intrusion is, whether the builder was innocent or careless, whether the owner shares any blame, and whether the hardship of tearing the structure down would be grossly disproportionate to the harm of letting it stay. A builder who knowingly built on someone else’s land is far more likely to be ordered to demolish. Where both sides acted reasonably and the encroachment was an honest mistake, courts lean toward money or an easement instead. Demolition itself is expensive, has to be coordinated with the local building department, and has to follow local demolition rules.
The Good-Faith Builder Exception
Not every builder crossed the line on purpose. A contractor may have relied on a wrong survey. A homeowner may have genuinely believed the line was ten feet further out. Roughly three-quarters of states have some form of “betterment” or “good faith improver” statute that gives these builders a way out that isn’t demolition.
Under the typical statute, the landowner gets a choice. Pay the builder for the value of the improvement, or sell the encroached-upon land to the builder at fair market value. The point is to keep the landowner from getting a free upgrade while still protecting their ownership. Courts also factor in how careless the builder was when deciding what relief is appropriate. A builder who hired a licensed surveyor and got a wrong result is a sympathetic figure. A builder who never checked at all is not.
To qualify, the builder has to prove genuine good faith. The mistake has to be factual, like a wrong survey, or legal, like confusion about which parcel a deed actually describes. Builders who knew or should have known the land belonged to someone else are not covered. The burden is on the builder, and courts look at the claim carefully. A survey that turned out to be wrong is strong evidence of good faith. Never bothering to check is close to fatal.
The Time Factor: Adverse Possession
Time cuts both ways in these disputes. If a landowner ignores an encroachment long enough, the encroacher can eventually claim ownership of the strip through adverse possession.
To succeed, the occupant has to prove their possession was continuous, open and obvious, hostile (meaning without the owner’s permission), actual, and exclusive. It has to be visible enough that a reasonable owner paying attention would notice it, and the occupant has to treat the land as their own.5Legal Information Institute. Adverse Possession
How long that takes depends on the state. Some allow claims after as few as five years when the occupant entered under color of title. Others require 20 years or more of continuous possession.6Justia. Adverse Possession Laws: 50-State Survey Several states add requirements on top, most commonly payment of property taxes on the occupied strip during the statutory period. In those states, an encroacher who never paid the taxes cannot claim adverse possession no matter how long the structure stood.
For the landowner, the takeaway is that doing nothing is dangerous. Every year a neighbor’s structure sits on your land without objection moves that neighbor closer to a permanent legal claim. Written permission actually defeats adverse possession, because the hostility element requires the occupant to lack the owner’s consent, but silence is not permission.5Legal Information Institute. Adverse Possession
What It Does to Selling or Buying the Property
Encroachments follow the property. A buyer is entitled to marketable title, meaning title free from material encumbrances or disputes that would make a reasonable buyer hesitate. An unresolved encroachment, in either direction, is exactly the kind of cloud on title that kills deals.
The problem usually surfaces during the title search or the buyer’s survey. When it does, the buyer’s attorney flags it. If the encroachment materially limits how the buyer can use the property, the buyer typically has the right to demand the seller resolve it before closing, or to walk away. Sellers who can’t clear it may have to accept a lower price, negotiate a boundary agreement with the neighbor, or lose the sale.
Title insurance won’t automatically bail either side out. Standard policies usually exclude boundary disputes and encroachments. Coverage for those risks generally requires additional endorsements, and those endorsements require a current survey. They aren’t included by default; the buyer has to ask for them.
If you already know about an encroachment on a property you plan to sell, deal with it before listing. Recording an encroachment agreement or a boundary line adjustment with the county resolves the issue on the public record and keeps it from blowing up a future closing.
Heading Off or Resolving the Dispute
The cheapest version of this problem is the one that never happens. Before any construction near a property line, get a professional boundary survey. Compare the results against your deed description and your building plans, and check setback requirements. Local building departments usually require a dimensioned plot plan showing all structures and their distances from the lines as part of the permit process. That review is supposed to catch encroachments before they happen, but only if the plot plan is accurate, which sends you back to the survey.
Sending a Formal Demand
If you’re the owner and you discover an encroachment, the usual first step is a written demand by certified mail. Identify the encroachment, assert your rights, attach supporting documentation such as a survey, and set a reasonable deadline for response or removal. Keep copies. A formal demand builds a paper trail that matters later, both for an injunction request and as evidence that you didn’t sit on your rights while adverse possession ran.
Negotiated Agreements
Many of these disputes settle without a lawsuit. Common solutions include selling or leasing the strip to the neighbor, granting an easement that lets the structure stay under defined conditions, or agreeing to a boundary line adjustment. Any written agreement should cover who pays for eventual removal, maintenance, liability if the structure causes damage, and limits on future expansion. Record it with the county so future buyers are on notice and the same fight doesn’t restart when either property changes hands.
Mediation
When direct talks stall, mediation is a lower-cost alternative to court. A neutral mediator helps both sides work toward a resolution. It fits neighbor disputes especially well because the parties usually have to keep living next to each other, and it allows creative outcomes a judge might not order, such as swapping strips of land or sharing the cost of relocating a structure.
Litigation
When negotiation and mediation don’t get there, a lawsuit may be the only way to end the dispute. Litigation is slow and expensive, but it produces a binding judgment. The court can award damages, issue an injunction, order demolition, or impose an equitable easement. Where the underlying facts are genuinely in doubt, with competing surveys or unclear deed language, litigation may be unavoidable. A quiet title action, which asks the court to establish who actually owns the disputed strip, is a common procedural tool when the boundary itself is in question rather than just the structure sitting on it.