- 2082 Bhadra · 2+4 marks
Revised vs supplementary estimate
Short answer
Types: preliminary, detailed, revised, supplementary, complete, annual repair, extension/improvement. A revised estimate replaces the original sanction when costs exceed the permitted limit (e.g., design change), covering the whole work; a supplementary estimate adds new work not in the original scope, leaving the original estimate valid.
List the various types of estimates. Differentiate between revised estimate and supplementary estimate for a project.
Types of estimates
- Preliminary (approximate) estimate
- Detailed estimate
- Revised estimate
- Supplementary estimate
- Complete estimate
- Annual repair and maintenance estimate
- Extension and improvement estimate
Revised versus supplementary estimate
| Basis | Revised estimate | Supplementary estimate |
|---|---|---|
| Meaning | New estimate that replaces the original sanctioned estimate | An additional estimate for extra work over the sanctioned one |
| Reason | Original cost will be exceeded (rate rise, design or quantity change) | New work not in the original estimate is needed during construction |
| Effect on original | Original is cancelled and replaced | Original remains valid; the new one is added to it |
| Scope | Covers the whole work (changed items and unchanged) | Covers only the additional items |
| Limit | Usually when cost exceeds the sanction by about 5% | Prepared whenever extra work is required |
| Example | Foundation deepened, cost rises, whole estimate redone | Boundary wall added to a building project |
✓ Answer checked by Claude Opus 5.5 (high effort)
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