What is the percentage of each activity in the construction of a residential building starting from excavation to finishing works? 

·        Excavation and footing-10%

·        Above basement-25%

·        Plastering-5%

·        Roof-5%

·        Painting-3%

·        Carpentary-13%

·        Plumbing-11%

·        Electrical -6%

·        Others - 2%