The Agreed-Boundary Doctrine in California

What the doctrine requires

The doctrine exists for a practical situation. Two owners cannot tell where the line runs, the records are unhelpful, and rather than litigate they agree on a marker and build to it. The law will hold them to that.

The elements are uncertainty as to the true line, an agreement fixing it, and acceptance of the agreed line for a period. Each element has to be established, and the first one is where most claims fail.

The limit the Supreme Court drew

Bryant v. Blevins narrowed the doctrine considerably. The court held it inapplicable where available legal records provide a reasonable basis for fixing the boundary, and where the party relying on it cannot show that uncertainty led to an agreement.

The practical effect is that a modern subdivision with clear recorded descriptions is poor ground for the doctrine. If a surveyor can locate the line from the record, there was no uncertainty to be resolved by agreement, and the fence is just a fence.

The court was also clear that acquiescence is not agreement. Two owners living either side of a fence for decades without ever discussing it have not agreed anything. Something more is needed.

What counts as evidence of agreement

Direct evidence is best and rarest: a written agreement, an exchange of letters, a recorded document. Failing that, conduct from which an agreement can be inferred, such as both owners contributing to building the fence at the time the line was in question, or a contemporaneous statement recorded somewhere.

What does not work is testimony that everyone assumed the fence was the line. That is acquiescence, and after Bryant it is not sufficient by itself.

If you are relying on it

The case is built on history, so the evidence is documentary and testimonial rather than physical. Old photographs with dates. Prior owners who can say what was discussed and when. Permits, invoices or receipts from when the fence was built. Anything showing the line was in question at the time.

Where that evidence does not exist, a prescriptive easement or an equitable claim may fit the facts better than an agreed boundary, and it is worth testing which theory the evidence actually supports before committing to one.

The evidence that supports a claim

A written agreement or exchange of correspondence between the owners at the relevant time. Rare and decisive.

Evidence that the line was in question when the marker was placed: a surveyor's note, a permit application, a letter, a contemporaneous complaint.

Shared conduct at the time, such as both owners paying for or building the fence together, which supports an inference of agreement rather than mere tolerance.

Prior owners who can testify about what was discussed and when. This is usually the only route available, and it deteriorates as people move and die.

Dated photographs establishing when the physical feature appeared.

What does not support it, after Bryant v. Blevins, is testimony that everybody assumed the fence was the line. That is acquiescence, and acquiescence alone is not agreement.

If the doctrine does not fit

Most claims that begin as agreed boundary turn out to fit something else better, and it is worth testing the alternatives before committing.

A prescriptive easement, where the use continued openly for five years without permission. This gives a right to keep using the strip rather than ownership of it, which is frequently what the claimant actually wants.

Adverse possession, if the land claimed corresponds to an assessed parcel and the taxes were paid, which over a strip is unusual.

An equitable easement, where a court balances the hardship of removing a long-standing encroachment against the harm of leaving it.

Or a negotiated boundary line agreement, recorded against both parcels, which produces certainty for both owners and for every future owner without anyone litigating.

This article is general information about California law and is not legal advice for any specific situation. If you are dealing with this issue, the facts of your matter will change the analysis.