This study investigates the recycling of crushed limestone (CL) from construction and demolition (C&D) activities and scrap rubber (R) from end-of-life tires to promote sustainability and circular economy principles in Saudi Arabia. The research aims to examine the physical and mechanical properties of Crushed Limestone and Rubber Mixture (CLRM), including specific gravity (Gs), compaction, one-dimensional compressibility, and California bearing ratio (CBR) testing, as a preliminary assessment for potential use as an alternative for geotechnical materials used in different applications. The aim is to determine optimal mixtures for various geotechnical applications, addressing the challenges of waste management in the context of Saudi Arabia's rapid development and Vision 2030 objectives. The design of experiment technique was employed to select the mixture doses. The findings highlight the potential of CLRM as a sustainable alternative to subgrades and embankments, offering a contribution to the development of sustainable construction materials, aligning with the United Nations’ Sustainable Development Goals, and supporting Saudi Arabia's transition toward a more efficient and environmentally responsible economy.