Discuss the different type of details estimate.

 

Different Types of Detailed Estimates (Civil Engineering)

Definition (1 mark)
A detailed estimate is the complete and item-wise calculation of quantities and costs of all materials, labor, equipment, and overheads required for a construction project based on working drawings and specifications.

---

Types of Detailed Estimates

1. Original (Detailed) Estimate

• Prepared before the start of construction.
• Based on complete drawings and specifications.
• Includes all items such as earthwork, concrete, masonry, finishing, etc.
• Used for technical sanction, budgeting, and tendering.

Example: Estimate for construction of a new residential building.

---

2. Revised Estimate

• Prepared when the cost of the original estimate is likely to exceed by 5–10% or more due to changes in rates, design, or quantities.
• Includes a comparison between the original and revised cost.
• Requires fresh approval.

Example: Increase in cement price or design modification in foundation.

---

3. Supplementary Estimate

• Prepared when additional work not included in the original estimate is required.
• Does not replace the original estimate but is added to it.

Example: Addition of a boundary wall or extra room after project approval.

---

4. Revised and Supplementary Estimate

• Combination of both revised and supplementary estimates.
• Prepared when both cost increase and additional work occur.

Example: Change in structure design + addition of new components.

---

5. Annual Repair (Maintenance) Estimate

• Prepared for routine maintenance works to keep the structure in good condition.
• Includes minor repairs like whitewashing, painting, patchwork, etc.
• Usually prepared every year.

---

6. Special Repair Estimate

• Prepared for major repair or restoration work after damage or long use.
• Not routine; done occasionally to restore original condition.

Example: Repair after earthquake damage or structural deterioration.

---

Conclusion (1 mark)

Different types of detailed estimates are essential for proper planning, cost control, and execution of construction projects. They help in managing changes, maintenance, and financial approvals efficiently, ensuring smooth project completion.