Do You Need a Permit for a Radon Mitigation System? in Spanje
Sometimes. Many US states and European countries require contractor licensing for radon mitigation, and some jurisdictions require permits for sub-slab depressurization systems that penetrate the building envelope. The work involves drilling through foundation slabs, installing PVC piping, and wiring an exhaust fan — any of which may independently trigger building or electrical permits. In areas with high radon concentrations, post-installation testing is often mandatory.
Do you need a permit?
Sometimes
- Permitting authority
- Consejo de Seguridad Nuclear (CSN)
- Typical fee
- €100–€500
What triggers a permit
- Penetration through the foundation slab for sub-slab depressurization piping
- Penetration through the roof or exterior wall for exhaust vent piping
- New dedicated electrical circuit for the radon fan (typically 110V/15A)
- State or local requirement for a licensed radon mitigation contractor
- Post-installation radon testing required by local health department
Country-specific detail
In Spain, radon mitigation is regulated under the Código Técnico de la Edificación (CTE), which was updated to include Documento Básico HS6 (Protección frente al radón) following the EU BSS Directive transposition. The CTE HS6 applies primarily to new construction and major renovations in municipios classified as zona de actuación prioritaria (priority action zones) by the Consejo de Seguridad Nuclear (CSN). Retrofitting an existing vivienda with a sistema de mitigación de radón involving perforación de la solera (slab drilling) typically requires a declaración responsable or licencia de obra menor from the Ayuntamiento. The CSN publishes a mapa de zonas de radón that identifies affected areas (mainly Galicia, western Castilla y León, Extremadura, and parts of Madrid). Instalaciones eléctricas for the extractor fan require an updated Boletín Eléctrico (CIE).