Sustainability manufacturing is indispensable to change and adapt from existing processes which enrich huge expertise. However, it needs to have prior assessment. Thai SME bus building companies are mostly established for more than 30 years of experiences. However, they still lack of competitiveness. The manufacturing process is time consuming, high costs and used extra material. This paper proposes the sustainability manufacturing assessment according to the D4S method associated by PCA tool. Five major companies in Thailand are surveyed and mapped to diagnose for sustainability level.