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Types of estimates and when prepared
Short answer
Estimate types include preliminary (before design for approval), detailed (after drawings for tender), revised (when sanctioned cost will be exceeded), supplementary (for extra work during construction), and complete (total project cost including non-construction components). Examples are a school plinth-area estimate, hospital detailed estimate, bridge revised estimate, added boundary wall, and hospital with equipment.
List the various types of estimates and describe the circumstances under which each (preliminary, detailed, revised, supplementary, complete) is prepared, with examples.
| Type | Meaning | Circumstances in which it is prepared | Example |
|---|---|---|---|
| Preliminary (approximate) estimate | Rough cost from plinth area/unit rates, before design | Planning, feasibility and administrative approval | School of 600 students by plinth area rate |
| Detailed estimate | Item-wise quantities with rates and abstract | After design and drawings, for technical sanction and tender | Detailed estimate of a hospital building |
| Revised estimate | New estimate replacing the sanctioned one | The sanctioned estimate is likely to be exceeded by more than the allowed limit (usually 5%) due to rate rise, design change or quantity change | Estimate of a bridge revised after a deeper foundation was needed |
| Supplementary estimate | Estimate for additional work not included earlier | Extra work is needed during construction on an already-sanctioned project | Adding a boundary wall to a building under construction |
| Complete estimate | Total cost of all components of a project | To know the final overall cost including land, design, equipment and services | Complete cost of a hospital with equipment |
| Annual repair and maintenance estimate | Yearly cost of repairs | Preparing the yearly maintenance budget | Maintenance of a road section |
| Extension and improvement estimate | Cost of new additions and improvement | When an existing structure is extended | Extra floor on a building |
Circumstances (summary)
- Preliminary: at the approval stage, when drawings are not ready.
- Detailed: once drawings are available, before tendering; it is the basis of the contract.
- Revised: when the original sanction will be exceeded; it replaces the old estimate.
- Supplementary: for a new addition to a sanctioned work; the original remains valid.
- Complete: where the project cost includes more than construction.
✓ Answer checked by Claude Opus 5.5 (high effort)
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