An RC check (Reinforced Concrete check) combined with New Cross Laminated Timber (CLT) is an innovative approach in modern construction, where civil engineers analyze and optimize the integration of reinforced concrete and CLT to create a sustainable, efficient, and structurally sound building. The RC check ensures that the reinforced concrete elements meet the required safety standards and load-bearing capacities, while the addition of CLT offers an eco-friendly alternative to traditional materials, providing high-strength performance with lower environmental impact. CLT panels, made from layers of timber bonded together, are used for floors, walls, and roofs, enhancing thermal insulation and reducing carbon emissions compared to conventional concrete or steel structures. Engineers carefully design the hybrid structure, balancing the strength of reinforced concrete with the lightweight and sustainable properties of CLT to meet building codes and maximize performance. This combination is ideal for residential, commercial, and industrial projects, offering a modern, cost-effective, and sustainable solution for the growing demand for green building practices.