This document estimates the costs for excavation work, lean concrete, hardcore, and concrete work below the lowest floor level of a building. It includes calculations for the material and labor costs to excavate to reduce the ground level, excavate pits for pad footings and stumps, and excavate trenches for ground beams. It also includes cost estimates for lean concrete screeds under pad footings, ground beams, and the ground floor slab, as well as hardcore under these elements. Finally, it provides cost calculations for vibrated reinforced concrete in pad footings, column stumps, ground beams, and concrete beds at different thicknesses. The estimates are based on material quantities and unit rates, with allowances made for labor costs,