This chapter introduces the Business-Driven 1.5 °C Lifestyles Framework (BD1.5LF), a model that positions companies as ecosystem designers shaping infrastructure, narratives, and market conditions to advance the transition to 1.5 °C-compatible lifestyles. The framework outlines three interconnected opportunity areas—Innovation and Sustainable Design, Policy Influence and Market Conditions, and Narratives and Attitudinal Change—providing a structured approach for companies to move beyond traditional value chain interventions and redesign the social and material contexts of consumption. Drawing from a participatory workshop at the 2025 Management and Social Justice Conference, the chapter demonstrates how technology, when integrated with strategic design, can help make low-carbon lifestyle options more accessible, appealing, and scalable. By bridging theory and practice, this chapter highlights the critical role of business in enabling systemic change toward a sustainable and equitable future.