This thesis examines how urban planning in Geneva does—or does not—address intellectual disability. Using a qualitative, critical design, it combines analysis of policy and legal documents (PDCn 2030; municipal master plans of Lancy/Chêne-Bourg), interviews with municipal officials and practitioners (Urbaplan, HAU), and a go-along “parcours commenté” with a participant to surface obstacles and cognitive-accessibility needs. Findings show a universalist discourse and technical norms that prioritise physical accessibility while neglecting cognitive issues, producing spatial ableism and an implicit hierarchy of disabilities. The thesis argues for operational criteria for cognitive accessibility and for the direct participation of people with intellectual disabilities to shift practices toward genuine inclusion.