Lot line adjustments and lot splits sound similar but trigger very different legal processes, and confusing the two can cost months of delay or an application that never should have been filed. Understanding which process actually applies before filing anything with the local planning department is the first step.
This guide covers how a lot line adjustment works, how it differs from a lot split, what the Subdivision Map Act requires, and what a Certificate of Compliance actually means.
What Is a Lot Line Adjustment?
Lot line adjustments in California allow a property owner to modify the boundary between four or fewer adjoining legal parcels. The key feature is that no new parcels are created and none are eliminated; the change simply moves a boundary line between parcels that already exist.
Lot line adjustments must meet several conditions: no new parcel is created and none is deleted, no parcel is reduced below the minimum lot area required by local zoning, the change is exempt from the Subdivision Map Act, and public rights-of-way are not altered without the appropriate governmental approval. The process can also be used to reduce the number of parcels, going from two parcels to one, for example, but it cannot be used to increase the number of parcels.
How the Process Works
California statute sets the basic framework, but the local planning department controls the specific requirements through zoning and building codes. Application fees are generally non-refundable even if the application is ultimately denied, which makes it worth confirming eligibility with the planning department before filing.
The planning department will typically require a civil engineer or licensed land surveyor to prepare a new legal description for each affected lot. Once approved, the county issues a Certificate of Compliance, which serves as an official record that the parcel was legally created. A Certificate of Compliance does not grant permission to build; it only confirms the parcel’s legal status.
Lot Line Adjustment vs. Lot Split
A lot split, sometimes called a subdivision, is a different process entirely. It separates one parcel into two or more new parcels, each receiving its own Assessor’s Parcel Number and its own property tax bill. Where lot line adjustments simply reshape existing lots, a lot split creates entirely new ones, and any division resulting in five or more parcels triggers the full requirements of the Subdivision Map Act.
The Subdivision Map Act’s Role
California courts have summarized the purpose of the Subdivision Map Act as regulating the design and improvement of subdivisions, ensuring proper consideration for adjoining areas, preventing fraud, and protecting both the public and purchasers of subdivided land. (Pratt v. Adams (1964) 229 Cal.App.2d 602.) Any subdivider creating five or more parcels generally must obtain approval of a tentative map, then a final map, before those parcels can be sold, financed, or developed. Lot line adjustments, by contrast, are specifically exempt from this requirement, which is what makes them the faster and simpler of the two processes.
A Note on Dashed-Line Parcels
When reviewing a parcel or plat map, a parcel shown with a dashed boundary line was not created through a formal parcel map or tract map process. It may have been created by deed or by a parcel map waiver, and may or may not already have a Certificate of Compliance on file. The only reliable way to confirm whether one has been issued is a preliminary title search; otherwise, an owner can apply for their own Certificate of Compliance, though approval isn’t guaranteed and depends on how the parcel was originally created.
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What is a lot line adjustment in California?
A lot line adjustment modifies the boundary lines between four or fewer adjoining parcels of land. No new parcels are created. It’s used to make minor revisions to property lines between existing legal lots.
What is the difference between a lot line adjustment and a lot split?
A lot line adjustment changes boundaries between existing parcels without creating new ones. A lot split (subdivision) divides one parcel into two or more new parcels and requires compliance with the Subdivision Map Act.
Disclaimer: Every situation is different and particular facts may vary thereby changing or altering a possible course of action or conclusion. The information contained herein is intended to be general in nature as laws vary between federal, state, counties, and municipalities and therefore may not apply to any given matter. This information is not intended to be legal advice or relied upon as a legal opinion, course of action, accounting, tax or other professional service. You should consult the proper legal or professional advisor knowledgeable in the area that pertains to your particular situation.
