- 2067 Asar (old course) · 3 marks
Estimate, quantity survey, estimated vs actual
Short answer
An estimate is a forecast of probable quantities and cost before construction. A quantity survey measures work items from drawings to prepare a bill of quantities. Estimated cost is approximate and used for planning, while actual cost is the exact expenditure recorded after completion.
What is an estimate? What is meant by quantity survey? Distinguish between estimated and actual cost.
Estimate
An estimate is the calculation of the probable quantities and cost of a work before construction, based on the drawings, specifications and current rates.
Quantity survey
Quantity survey (quantity surveying) is the process of measuring and calculating the quantities of the different items of work and materials from the drawings, and arranging them in a bill of quantities. It is the first step of estimating. It is also used later to measure the completed work for payment.
Estimated cost versus actual cost
| Estimated cost | Actual cost |
|---|---|
| Probable cost calculated before execution | Real cost incurred after execution |
| Based on drawings, norms and current rates | Based on bills, vouchers and measurements |
| Approximate; has contingency | Exact and final |
| Used for approval, budget, tendering | Used for final payment and records |
| Can be revised before or during work | Cannot be changed |
✓ Answer checked by Claude Opus 5.5 (high effort)
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