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Preparing a detailed estimate of a building

Short answer

Study the drawings and specifications, then list items in construction order. Take out quantities using the long wall-short wall or centre line method on dimension sheets. Abstract quantities into a bill of quantities, adopt or analyse rates, and compute cost (quantity × rate). Add contingency (3–5%) and VAT (13%) to get the total estimated cost, and prepare a report.

Describe how you will prepare a detailed estimate of a building.

A detailed estimate is prepared by dividing the building into items of work, taking out the quantities of each item from the drawings, and applying rates. The steps are:

  1. Study the drawings and specifications: plan, section, elevation, foundation and structural drawings, and door/window schedules.
  2. List the items in the order of construction: earthwork, PCC, foundation masonry/RCC, DPC, superstructure masonry, columns, beams, slab, doors and windows, plastering, flooring, painting, roofing, sanitary and electrical works.
  3. Take out quantities of each item using the long wall-short wall or centre line method. Use the dimension columns: number x length x breadth x height, and make deductions for openings. A quantity sheet looks like this:
ItemNo.LBHQuantity
  1. Abstract the quantities (collect similar items) in a bill of quantities.
  2. Rate analysis: adopt rates from the District Rate or analyse them using DUDBC norms and local rates.
  3. Abstract of cost: quantity x rate for each item gives the amount; sum of all items is the base cost.
  4. Add provisions: contingency (3 to 5%), work-charged establishment/supervision, and VAT (13%) to get the total estimated cost.
  5. Prepare the report: a brief report with the specifications, assumptions, drawings, and the cost summary.

✓ Answer checked by Claude Opus 5.5 (high effort)

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