The paradox embodied by the so-called Cathedral of Mejorada del Campo, an edifice initiated in 1961 by the self-taught builder Justo Gallego and subsequently transformed into a locus of symbolic devotion, architectural singularity and social assistance, now subject to municipal closure on the grounds of lacking formal licences, thereby foregrounding the tension between charismatic construction and regulatory sovereignty. Conceived without approved plans and assembled through recycled materials, the structure emerged as an act of personal faith materialised in brick, concrete and improvised engineering, progressively acquiring media resonance and communal attachment despite its juridical irregularity; its unfinished towers, circular drum and eclectic historicist references evoke both aspiration and fragility, situating the building in a liminal condition between sanctuary and anomaly. The recent decree issued by the Ayuntamiento of Mejorada del Campo in February 2025, affecting public visits, exhibitions and the humanitarian activities undertaken by the NGO Mensajeros de la Paz under Padre Ángel’s presidency, crystallises a fundamental dilemma: can an architecture born outside normative frameworks sustain public use without institutional validation. As a case study in informal monumentalism, the cathedral exemplifies how individual agency can generate spatial magnitude yet remain structurally and administratively vulnerable, particularly when programmes expand to include food distribution and temporary accommodation for vulnerable persons, intensifying the demand for safety compliance. Ultimately, the closure does not merely suspend access; it reasserts the primacy of procedural legality over affective legitimacy, compelling reflection on whether architectural meaning derives from devotion and social function or from adherence to codified standards, and revealing how the boundary between visionary persistence and regulatory infringement defines the destiny of unlicensed monuments in contemporary urban governance. informal architecture, Mejorada del Campo cathedral, Justo Gallego, architectural legality, unlicensed buildings Spain, vernacular monumentalism, NGO Mensajeros de la Paz, urban regulation Madrid, self built cathedral, architectural governance The municipal closure exposes the conflict between visionary self built monumentality and institutional regulatory authority.