This article analyzes the technical and economic feasibility of integrating energy-efficient solutions and renewable energy sources (RES) into architectural design in Azerbaijan. The study begins by examining the current state of Azerbaijan's energy sector, which is heavily reliant on natural gas-fired thermal power plants, despite having substantial solar and wind energy potential. The primary aim is to identify optimal strategies for designing energy-efficient buildings in Azerbaijan, considering climatic conditions, available technologies, and economic factors. The methodology involves a multi-faceted approach: a review of passive and active energy efficiency strategies applicable to architectural design (including volumetric planning, natural lighting/ventilation, thermal insulation, shading, efficient HVAC, heat recovery, and Building Management Systems (BMS)); an assessment of Azerbaijan's solar and wind energy potential; and a multi-criteria SWOT analysis. Results indicate a significant, untapped potential for solar (23,000 MW) and wind (3,000 MW onshore, 157 GW offshore) energy in Azerbaijan. The SWOT analysis highlights the strong government support and favorable climate as major strengths, while acknowledging the current low RES penetration and a shortage of skilled professionals as weaknesses. Opportunities include declining global RES technology costs and a growing demand for "green" buildings. Threats include competition from the established fossil fuel sector and potential climate risks. The main conclusion is that integrating RES and energy-efficient design is not only technically feasible but also strategically vital for Azerbaijan's sustainable development, energy security, and environmental protection. Recommendations are formulated to develop an effective strategy for RES integration, focusing on supportive policies, capacity building, financial incentives, and public awareness campaigns. The findings contribute to the field of sustainable architecture by providing a context-specific analysis and practical guidance for architects, engineers, and policymakers in Azerbaijan and similar regions transitioning to a low-carbon energy future. The study's limitations include the reliance on publicly available data and the dynamic nature of energy policy, which requires ongoing monitoring and adaptation of strategies. The practical implications emphasize the need for updated building codes, training programs, and financial mechanisms to promote widespread adoption of energy-efficient and RES-integrated building designs.