The CJEU Draws a Red Line: Why Urban Planning Can No Longer Bypass EU Services Rules in STR Regulation

A pivotal moment for the European short-term rental (STR) industry has arrived through the Court of Justice of the European Union (CJEU). In a move that could force major cities across the continent to rewrite their housing regulations, the Advocate General (AG) has issued a hard-hitting Opinion in Case C-813/24, involving the platform Smartflats and the Brussels-Capital Region.

The Opinion establishes a critical legal precedent: Urban planning authorization regimes cannot be used as a shield to circumvent the strict requirements of the EU Services Directive.

For years, municipalities have used complex zoning and planning laws to restrict the STR market. The Advocate General has now made it clear that if these urban planning laws restrict market access, they must undergo the rigorous “proportionality test” required by EU law.

The Central Conflict: Urban Planning vs. Market Access

The central tension in Smartflats was whether Brussels regional legislation, which requires explicit urban planning authorization to change the use of a property from residential to tourist accommodation, fell within the scope of the EU Services Directive.

Regional authorities often argue that urban planning is a local competence, distinct from service regulation. However, the Advocate General disagreed. The Opinion states that, because these authorization regimes directly impact a service provider’s (the host or platform) ability to access the market, they must comply with the Directive.

This triggers a cascade of legal obligations for cities. It is no longer sufficient to cite “housing shortage” as a generic justification for restrictions; the regulatory process itself is now under scrutiny.

The 5 Pillars of Compliant Regulation

According to the Opinion, any Member State or city introducing authorization regimes for STRs must demonstrate that its measures meet five specific criteria. If a regulation fails even one, it may be deemed incompatible with EU law.

• Proven Necessity: The restriction must be justified by an overriding reason of public interest (e.g., combating a genuine housing shortage or protecting the urban environment). It cannot be pure economic protectionism in favor of hotels.

• Proportionality: The measure must be suitable to achieve the objective and must not go beyond what is necessary. If a less restrictive measure (such as a nightly cap rather than a ban) could work, the ban is illegal.

• Transparency: The rules must be clear, unambiguous, and public in advance.

• Legal Certainty: Hosts must be able to predict the outcome of their applications. Rules cannot be changed arbitrarily.

• Procedural Fairness: The application process must be objective and impartial.

The Critique of the Brussels Regime: A Warning for Other Cities

The Advocate General did not limit himself to outlining abstract principles; he applied them to the Brussels STR regime, flagging serious procedural shortcomings common to many other European cities.

The Opinion highlights that the Brussels system suffers from “broad municipal discretion” and “unclear criteria”. When a municipal council can reject a license based on vague feelings about “neighborhood character” without objective metrics, legal certainty is undermined.

Furthermore, the AG stressed that a compliant system must provide for:

• Binding deadlines for authorities to make a decision.

• The obligation to give reasons for any rejection.

• Effective remedies (a clear path to challenge a rejection).

The “Administrative Silence” Bombshell

Perhaps the most explosive part of the Opinion concerns the concept of “Administrative Silence.”

In many jurisdictions (including parts of Spain and Italy), if a host submits a license application and the municipality does not respond, it is treated as “negative silence,” an automatic rejection.

The Advocate General warns that this practice likely violates EU rules. Under the Services Directive, the general rule is that authorization is deemed granted if the competent authority does not respond within the established deadline. Reversing this rule (treating silence as rejection) is only permitted in the presence of an overriding reason of public interest, which must be rigorously justified.

This shifts the entire administrative burden onto the municipality. They can no longer simply ignore applications to freeze the market; they must actively process them or face automatic approvals.

What Happens Now?

It is important to note that the Advocate General’s Opinion is not a final ruling, but the CJEU follows these opinions in the vast majority of cases.

If the Court confirms this reasoning in its final judgment, it will shape the next generation of STR regulation across the EU. Cities like Barcelona, Paris, Amsterdam, and Berlin will need to verify their current licensing regimes to ensure they do not rely on “administrative silence” or vague urban planning criteria that fail the proportionality test.

For the STR industry, this Opinion offers a new and powerful legal shield against arbitrary regulation. For municipalities, it is a call to immediately professionalize and objectify their licensing procedures.