The Coastal Commission Just Lost Its Biggest Jurisdictional Fight in Forty Years

If you develop, invest in, or hold property along California’s coast, you already know the California Coastal Commission has enormous influence over what gets built and what doesn’t. For decades, the Commission has exercised broad appellate authority over local permitting decisions, sometimes overriding county approvals on jurisdictional grounds that property owners had limited ability to challenge.

The California Supreme Court just narrowed that authority, unanimously, in a decision that changes the calculus for anyone navigating the coastal development process.

Two Decades of Permits and Denials

The developer in Shear Development Co., LLC v. California Coastal Commission (Cal. Supreme Ct., Apr. 23, 2026) purchased eight residential lots in Los Osos, an unincorporated community in San Luis Obispo County near Morro Bay, back in 2003. The lots were zoned Residential Single-Family and surrounded on three sides by existing homes. The County approved a coastal development permit in 2004 to build in two phases: four homes immediately and four more after the community sewer system was completed.

Shear built the first four homes without issue. When the sewer system was completed in 2016, Shear went back to the County for permits on the remaining lots. The County approved three of the four in 2019, finding that water and wastewater capacity was sufficient.

Two members of the Coastal Commission appealed the County’s decision to the Commission itself. The Commission denied the permits, asserting appellate jurisdiction on two grounds: that the proposed development was located in a sensitive coastal resource area under the County’s local coastal program, and that because the zoning designation listed more than one principal permitted use, the proposed homes did not qualify as “the” principal permitted use. Shear challenged both grounds in court. The trial court and the Court of Appeal sided with the Commission. The Supreme Court reversed on both counts.

When Two Agencies Disagree, the Court Decides for Itself

One of the threshold questions was what standard of review applies when a court evaluates whether the Commission properly exercised jurisdiction. The Commission argued for deferential substantial evidence review. The Supreme Court disagreed.

Because the dispute turned on how to interpret the County’s local coastal program, a legal question rather than a factual one, the Court held that courts must exercise their own independent judgment. An LCP is enacted law. Interpreting enacted law is a legal task, and courts do not defer to agencies on legal questions.

The more interesting part came next. Both the County and the Commission claimed deference for their respective interpretations of the same LCP. The County said its reading should control because it authored the document. The Commission said its reading should prevail because of its statewide expertise. The Court applied the standard Yamaha factors to both and concluded that neither entity had a clear interpretive advantage over the other. Both had participated in drafting and enforcing the LCP. Both had relevant expertise. Neither had a long-standing, consistent track record of interpreting the provision at issue. The result: no deference to either. The Court read the LCP for itself.

That principle will matter in cases well beyond coastal development. When two agencies that share responsibility for administering the same statutory scheme offer conflicting interpretations, a court owes no deference to either. The agency that gets to the courthouse first does not get to fix the meaning for everyone else.

The Development Was Not in a Sensitive Coastal Resource Area

The Commission’s primary jurisdictional claim rested on a single figure in the Estero Area Plan, Figure 6-3, which depicted the geographic extent of sandy soils known as the Los Osos Dune Sands. The Commission argued that the entire area shown on the map, including the developed urban portion of Los Osos where Shear’s lots are located, was part of a designated sensitive resource area.

The Court was not persuaded. The LCP’s text states that the sensitive resource area includes the dune sands “outside of Los Osos.” The standards for development within the SRA appear in the section of the LCP governing rural areas, not the section governing the Los Osos urban area. When the County proposed the amendment that created the SRA in 2008, the Commission itself recognized that the amendment did not apply to urban Los Osos and rejected portions that would have extended to the urban area.

The combining designation maps in the LCP do not depict all of urban Los Osos as a sensitive resource area. And the Commission could not point to a long-standing or consistent interpretation supporting its position. The Court noted that the Commission had not cited anything demonstrating it considered urban Los Osos to be part of the SRA at any time before it decided to take the appeal of Shear’s permit. That is a revealing gap. An agency claiming jurisdiction based on a decades-old designation should be able to show it actually treated that designation as applying to the area in question before the dispute arose.

The text, the structure, the maps, and the legislative history all pointed the same direction. The development was not in a sensitive resource area, and the Commission did not have appellate jurisdiction on that basis.

Multiple Permitted Uses Do Not Trigger Commission Jurisdiction

The Commission’s fallback argument was that it had jurisdiction because the site’s zoning designation listed three principal permitted uses (passive recreation, coastal accessways, and single-family dwellings) rather than one. The statute gives the Commission appellate jurisdiction over developments “not designated as the principal permitted use.” The Commission read “the” as meaning the sole use, so any zone with multiple listed uses would fall within its appellate reach.

The Court rejected this reading as well. The Public Resources Code contains a number inclusivity provision that says the singular includes the plural. Applied here, “the principal permitted use” means the principal permitted use or uses. If a local government designates several principal uses and the proposed development is for one of them, it qualifies. The Commission has appellate jurisdiction only when the development is not for any of the designated principal permitted uses.

The practical consequence of the Commission’s reading would have been sweeping. The County pointed out that its entire coastal zone is designated for more than one principal permitted use. Under the Commission’s interpretation, every coastal development in the County would be subject to Commission appellate review, effectively eliminating local permitting authority and rendering the other statutory bases for Commission jurisdiction meaningless. The Court was unwilling to read the statute in a way that would produce that result.

What This Means for Property Owners, Developers, and Investors

When the Commission’s jurisdiction depends on how a local coastal program is read, courts will no longer simply defer to the Commission’s interpretation. If the question is legal rather than factual, the court decides for itself. And when the local government disagrees with the Commission’s reading of its own LCP, the Commission does not automatically win. That alone changes the dynamic in contested permit cases.

The Commission also cannot use an ambiguous map or figure in an LCP to extend its jurisdiction into areas the text does not clearly designate as sensitive. The burden is on the Commission to point to something in the LCP that affirmatively designates the site as a sensitive resource area. If the text, the maps, and the legislative history do not support that designation, the jurisdiction claim fails. An illustration that happens to shade an area on a map is not the same as a legal designation, and after Shear, courts will be expected to recognize the difference.

For every coastal county that zones land for multiple principal permitted uses, the Commission’s authority to appeal local permit decisions just became meaningfully narrower. As long as the proposed development is for one of the designated principal uses, the Commission does not have appellate jurisdiction on that basis. That removes a theory the Commission has used for years to extend its reach into local permitting decisions.

For buyers and lenders evaluating coastal properties, this decision removes one source of regulatory uncertainty. A property that was previously at risk of Commission intervention based on aggressive jurisdictional readings may now have a clearer permitting path. For developers with pending or anticipated applications, Shear provides a framework for pushing back when the Commission’s jurisdiction rests on interpretive overreach rather than clear legal authority.

The Bottom Line

The Coastal Commission plays an important role in protecting California’s coastline. That role has statutory limits, and those limits matter. When the Commission overrides a local government’s permitting decision, it needs clear legal authority to do so. When it relies on a strained reading of a local coastal program to claim jurisdiction the LCP does not support, courts are now empowered, and obligated, to say no.

Shear is the most significant check on the Commission’s appellate jurisdiction since Nollan v. California Coastal Commission nearly four decades ago, decided unanimously by the California Supreme Court in an opinion authored by Chief Justice Guerrero. The principles it establishes will govern how courts, local governments, and the Commission interact on jurisdictional questions for years to come. Property owners along the coast should know what those principles are.

Coastal development permitting, real estate litigation, and disputes involving regulatory authority over land use are central areas of Horst Legal Counsel’s practice. If you have questions about how Shear affects your property, your portfolio, or a pending application, we are glad to talk through it. Contact us here.