This thesis investigates how pedestrian-friendly and aesthetically designed streets in Jönköping, Sweden, can serve as a model for enhancing sustainability and urban aesthetics in Eskişehir, Turkey. Street design significantly influences pedestrian mobility, environmental quality, and social interaction, which are all vital components of sustainable urban environments. While Jönköping prioritizes walkability, accessibility, and visual coherence, many parts of Eskişehir remain car-centric with fragmented pedestrian infrastructure. Using a case study approach, this research explores key design elements in Jönköping, including sidewalks, green spaces, and public street furniture, and analyses their potential to improve sustainability by promoting walkability, social interaction, and environmentally friendly spaces. Findings reveal that Jönköping’s pedestrian-oriented design reduces car dependence and creates inviting, balanced urban environments. Despite supportive urban planning policies, Eskişehir struggles with inconsistent implementation, limiting cohesive and walkable street environments. Nevertheless, transferable elements from Jönköping’s model, such as prioritizing pedestrians, enhancing accessibility, and integrating greenery and furniture, offer valuable guidance. Although challenges such as urban density, resource constraints, and sprawl exist, small-scale interventions can improve pedestrian experiences and overall sustainability in Eskişehir. This study contributes to sustainable urbanism by emphasizing human-centered, context-sensitive street design that supports walkability, aesthetics, and social inclusion. It aligns with global sustainability goals promoting safe and accessible cities. Future research could examine the long-term effects of applying pedestrian-friendly principles in other Turkish cities with varying geographic and socio-economic conditions. Urban policymakers and planners can utilize these insights to enhance liveability through improved street-level design. While focused on Jönköping and Eskişehir, the strategies identified here are adaptable to diverse urban contexts.