Constitutional Amparo in Spain: Requirements, Procedure and Strategy 2026

The recurso de amparo before the Constitutional Court (TC) is Spain's primary mechanism for protecting fundamental rights (Arts. 14–29 CE) against public authority violations. Since the LO 6/2007 reform, admissibility requires demonstrating special constitutional relevance (trascendencia constitucional), the TC admits only a small minority of applications.

Key Requirements

1. Exhaustion of ordinary judicial remedies: including the mandatory incidente de nulidad de actuaciones (Art. 241 LOPJ) when the violation originates in a judicial decisión
2. Prior invocation of the fundamental right in the ordinary proceedings (Art. 44.1.c LOTC)
3. 30 calendar-court-day deadline from notification of the final ordinary-court decisión
4. Justified constitutional relevance: expressly identifying which of the 14 STC 155/2009 grounds applies

Constitutional Relevance (STC 155/2009)

The TC's seminal STC 155/2009 lists 14 grounds, grouped in three categories: new constitutional doctrine needed, clarification or change of existing doctrine, and general social/economic impact transcending the individual case.

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Lexiel searches TC case law by fundamental right and trascendencia constitucional ground, and drafts the relevance justification section; the single most common cause of inadmissibility.