This study explores the role of young people in urban planning through the lens of procedural justice, focusing on their engagement and participation in research seeking to further youth use and perception of public space. Conducted in Huddinge Municipality, Sweden, the research involved youth as co-researchers in participatory mapping exercises to document their spatial preferences and experiences. Findings highlight the importance of inclusive urban planning that recognizes young people as legitimate stakeholders. Liked spaces were often those that supported social interaction, physical activity, and autonomy, while disliked spaces in the municipality were those the young respondents associate with fear and feelings of discomfort. This study casts a perspective on the need for planning practices that accommodate diverse youth perspectives and promote equitable access to public spaces. Despite challenges in institutional uptake, the research demonstrates the potential of youth participatory methods to inform our understanding and practice for advancing towards more just and responsive urban governance. This work contributes to ongoing debates on spatial justice and the inclusion of marginalized groups in urban decision-making.