Zoning & Land Use  ·  November 13, 2026

Lot Line Adjustments in California: Rules and Disputes

The short answer

A lot line adjustment moves the boundary between parcels that already exist without creating a new one. California's Subdivision Map Act does not apply to it if it fits Government Code section 66412, subdivision (d):

• Four or fewer existing adjoining parcels, where land taken from one parcel is added to an adjoining parcel and "a greater number of parcels than originally existed is not thereby created."
• Limited city or county review. The agency "shall limit its review and approval" to whether the resulting parcels conform to the general plan, any applicable specific plan or coastal plan, and zoning and building ordinances.
• Limited conditions. The agency may not impose conditions or exactions except to achieve that conformity, to require prepayment of property taxes, or to facilitate relocating existing utilities, infrastructure or easements.
• A recorded deed. "The lot line adjustment shall be reflected in a deed, which shall be recorded."

Approval is usually ministerial, which generally takes it outside the California Environmental Quality Act (CEQA). In 2026 the Sixth District Court of Appeal held that a Los Gatos lot line adjustment did not qualify for CEQA's ministerial exemption because the approval also included the town's discretionary acceptance of a cul-de-sac easement dedication. Between neighbors, the city's approval is only half the deal; the private agreement and the recorded deed are the other half.

When is a lot line adjustment ministerial?

What the statute allows

The current text of section 66412(d) requires that the adjustment be approved by the local agency or advisory agency, and it bars the agency from requiring a tentative, parcel or final map as a condition. It also provides that no record of survey is required "unless required by Section 8762 of the Business and Professions Code," and that the agency "shall approve or disapprove a lot line adjustment pursuant to the Permit Streamlining Act." Courts read this as a narrow lane. In Sierra Club v. Napa County Bd. of Supervisors (2012) 205 Cal.App.4th 162, the First District listed four criteria: the adjustment is between four or fewer parcels, the parcels adjoin, the adjustment does not result in more parcels than originally existed, and the local agency approves it. The court described section 66412 as "a prototypical ministerial approval process" and, quoting San Dieguito Partnership v. City of San Diego (1992) 7 Cal.App.4th 748, 760, said the approving agency's role "is strictly circumscribed by the Legislature in a lot line adjustment."

Sequential adjustments

Sierra Club also upheld a Napa County ordinance allowing sequential lot line adjustments, where each application covered four or fewer adjoining parcels and the deeds for one adjustment had to be recorded before the next was filed. The ordinance also barred adjustments that would make a nonbuildable parcel buildable. The court held the ordinance consistent with the Map Act and, because it set out a ministerial process, exempt from CEQA. Local ordinances differ, so another county's rules can produce a different answer.

The parcels have to exist lawfully first

A lot line adjustment works only on "existing" parcels. If there is doubt about whether a parcel was lawfully created, that question comes first.

• Certificates of compliance. Under Government Code section 66499.35, an owner may ask the local agency to determine whether the property complies with the Map Act and local ordinances. If it does, the agency "shall cause a certificate of compliance to be filed." If it does not, the agency issues a conditional certificate. In Findleton v. Board of Supervisors (1993) 12 Cal.App.4th 709, the court held that a request for a certificate of compliance was a ministerial project, not a development project under the Permit Streamlining Act, because the statute "confers no discretion" to deny one where compliance is found.
• Old maps. In Gardner v. County of Sonoma (2003) 29 Cal.4th 990, the California Supreme Court held that an 1865 subdivision map, recorded before any applicable subdivision law existed, did not by itself create legally recognized parcels.
• Pre-1972 parcels. Government Code section 66412.6, subdivision (a), conclusively presumes that a parcel created before March 4, 1972 was lawfully created if it came from a division creating fewer than five parcels at a time when no local ordinance regulated such divisions.

If a transaction does not fit section 66412(d), the exclusion does not apply and the Map Act does. Section 66499.30 bars selling, leasing or financing a parcel for which a final or parcel map is required until that map is recorded, though an offer or contract expressly conditioned on approval and filing of the map is not prohibited. Under section 66499.32, a deed or contract for property divided in violation of the Act is voidable at the buyer's option "within one year after the date of discovery of the violation," and a grantee may sue for damages within one year of discovering it.

When does a lot line adjustment need CEQA review?

The general rule

CEQA does not apply to "[m]inisterial projects proposed to be carried out or approved by public agencies." (Pub. Resources Code, § 21080, subd. (b)(1).) The CEQA Guidelines define a discretionary project as one requiring "the exercise of judgment or deliberation," and state that "[t]he key question is whether the public agency can use its subjective judgment to decide whether and how to carry out or approve a project." (Cal. Code Regs., tit. 14, § 15357.) Guidelines section 15268, subdivision (d), adds that a project with both ministerial and discretionary elements "will be deemed to be discretionary." Steer, discussed below, notes this applies only where the discretionary element lets the agency mitigate environmental impacts.

A separate categorical exemption, Class 5, covers minor alterations in land use limitations "in areas with an average slope of less than 20%" that do not change land use or density, including "[m]inor lot line adjustments ... not resulting in the creation of any new parcel." (Guidelines, § 15305, subd. (a).) That exemption carries its own slope and density limits, so it does not cover every adjustment.

Steer v. Town of Los Gatos

The case is Steer v. Town of Los Gatos (2026) 123 Cal.App.5th 1067. Filed unpublished on September 3, 2026, it was certified for publication on October 5, 2026.

The facts. The owners of three adjoining residential parcels in the town's R1-20 zone applied in 2023 to reconfigure them. One parcel had a house and street frontage. The other two were unimproved, had no street frontage, and one was below the zone's 20,000-square-foot minimum. The zone also requires 100 feet of street frontage, or 30 feet on a cul-de-sac bulb. To supply frontage, the approval required the owners to make irrevocable offers of dedication of a cul-de-sac easement, and required the town engineer to accept them within 30 days of the dedication. The town treated the whole approval as ministerial and filed a notice of exemption on December 20, 2023. A neighbor petitioned for a writ of mandate. The trial court denied the petition.

The holding. The Court of Appeal reversed and directed the trial court to grant the writ. Its key steps:

• The project was the lot line adjustment, the dedication and acceptance of the property, and the resulting delineation of the cul-de-sac on the town map. It did not include future construction of the cul-de-sac or of houses, which the town had said would need a separate discretionary permit with environmental review.
• Accepting a common law offer of dedication is discretionary. The court found "no authority suggesting that a public agency is required to accept an offer of dedication in any circumstance."
• The town's discretion extended to environmental concerns, because it could reject or require changes to the offer of dedication on that basis.
• The reason the dedication was included did not matter: "it is immaterial why the offer of dedication was included in the application."

The court put the core point this way: "Merely because approval of a lot line adjustment pursuant to Government Code section 66412, subdivision (d), is typically ministerial, it does not follow that it is always ministerial." Section 66412(d) "does not place an agency in a ministerial box that strips it of any discretion it would otherwise have over a project approval."

What the court did not decide. It held that the neighbor's argument based on Save Tara v. City of West Hollywood (2008) 45 Cal.4th 116 was premature, treated a piecemealing argument as forfeited, and expressly did not decide whether a lot line adjustment approval could support a vested right. It also distinguished Sierra Club in part because the Napa ordinance excluded adjustments processed together with another discretionary approval. How far Steer reaches beyond street dedications is for later cases.

The practical lesson. Folding another discretionary approval into a lot line adjustment risks turning the whole approval into a discretionary project subject to CEQA, if that approval lets the agency respond to environmental concerns. A neighbor opposing an adjustment should look at what else the agency is approving at the same time.

What if my neighbor backs out of a lot line agreement?

Neighbors often agree to move a line before anyone files with the city. That agreement is a contract to transfer an interest in real property, and several rules apply to it.

Put it in writing. Under Civil Code section 1624, subdivision (a)(3), an agreement "for the sale of real property, or of an interest therein" is invalid unless it, or a note or memorandum of it, is in writing and signed by the party to be charged. Subdivision (d) adds that a text message or instant message, without a qualifying written confirmation, is insufficient to form a contract to convey real property.

Specific performance is presumptively available. Civil Code section 3387 provides that "the breach of an agreement to transfer real property cannot be adequately relieved by pecuniary compensation." For a single-family home the party seeking performance intends to occupy, that presumption is conclusive. In other cases it is a presumption affecting the burden of proof. Because the city must still approve, a well-drafted agreement makes performance depend on approval and says who applies, who pays, and what happens if the city denies it or adds conditions.

The deadline. An action on a written contract must be brought within four years. (Code Civ. Proc., § 337, subd. (a).) The period generally runs from the breach, not from the date the agreement was signed. An oral agreement runs into the statute of frauds problem described above.

Lenders and title insurers. Section 66412(d) requires a recorded deed but says nothing about existing deeds of trust or title policies. Before recording, confirm with each lender and the title company how the existing loans and policies will be handled for the land that changes hands.

The agreed-boundary doctrine is not a shortcut

The agreed-boundary doctrine recognizes a line neighbors have lived with only in narrow cases. In Bryant v. Blevins (1994) 9 Cal.4th 47, 55, the California Supreme Court restated the requirements, quoting earlier precedent: "[1] an uncertainty as to the true boundary line, [2] an agreement between the coterminous owners fixing the line, and [3] acceptance and acquiescence in the line so fixed for a period equal to the statute of limitations or under such circumstances that substantial loss would be caused by a change of its position." The court held the doctrine did not apply where legal records provided a reasonable basis for fixing the boundary and the party relying on it failed to show that uncertainty about the true line led to an agreement.

Our article on whether a neighbor can claim part of your yard covers agreed boundaries, adverse possession and prescriptive easements, and our article on how long you have to sue over an encroachment covers what happens when a fence or structure already crosses the line and the adjustment deal falls through.

How do I challenge a city's lot line adjustment decision?

An owner whose application is stalled or denied. Because review is limited to conformity with the general plan, applicable specific or coastal plan, and zoning and building ordinances, a denial or condition outside those grounds is open to challenge by petition for writ of mandate. Section 66412(d) also requires the agency to act under the Permit Streamlining Act. How that Act's deadlines and deemed-approval remedy apply to a ministerial adjustment is unresolved in any published decision we found: section 65928 excludes ministerial projects from the Act's development projects (the basis of Findleton), yet section 65950 sets a 60-day deadline for a development project subject to ministerial review. Our article on permit delay remedies explains those clocks and why a deemed approval should not be relied on without a court order or the agency's written acknowledgment.

A neighbor challenging an approval under CEQA. Public Resources Code section 21167, subdivision (d), sets the deadline to claim an agency wrongly treated a project as exempt under section 21080(b):

• 35 days from the date the agency files a notice of exemption.
• 180 days from the agency's decision to approve the project if no notice of exemption was filed.

The 35-day clock starts when the notice is filed, not when the neighbor learns of it. Section 21167, subdivision (f), says that mailing a copy of the notice to someone who asked for it does not change these periods.

A Map Act challenge. Government Code section 66499.37 requires an action to attack a decision "concerning a subdivision," or any condition attached to it, to be commenced and served within 90 days after the date of the decision. Lot line adjustments that fit section 66412(d) are excluded from the Act. In People ex rel. Brown v. Tehama County Bd. of Supervisors (2007) 149 Cal.App.4th 422, 431-432, the court held that the party invoking the 90-day period had not shown it applied to a lot line adjustment approved by a planning director, because nothing showed he was an advisory agency, appeal board or legislative body. The cautious course is still to calendar 90 days from the decision for both filing and service.

Use the local appeal process. In Steer, the neighbor appealed the development review commission's approval to the planning commission and then to the town council, and raised the CEQA objection to the council before filing suit. Check the local code for appeal deadlines, which can be much shorter than the statutory ones above.

What to do before you sign or file

1. Confirm every parcel exists lawfully, using a certificate of compliance under section 66499.35 where the history is unclear.
2. Count the parcels. Four or fewer existing adjoining parcels, and no new parcel.
3. Read the local ordinance. Sierra Club turned on the terms of Napa's.
4. Keep the application to the adjustment if you can. After Steer, adding a dedication or another discretionary approval can invite a CEQA challenge.
5. Sign a written agreement with your neighbor that depends on city approval and addresses costs, lenders and title.
6. Record the deed. The statute requires it.

Our zoning and land use practice handles disputes with cities over adjustments and entitlements, and our boundary and easement practice handles disputes between neighbors over where the line is and what was agreed.

Common questions

This article is general information about California law, not legal advice, and reading it does not create an attorney-client relationship. Statutes and case law change, and how they apply depends on the specific facts. Attorney advertising. Prior results do not guarantee similar outcomes. Robert B. Mobasseri, State Bar No. 193193, ROMO Law Group, Encino, California.