Methods of Detailed Construction Estimation Preparation | Civil Engineering Optional Notes for UPSC PDF Download

Detailed construction estimates provide a comprehensive analysis of all the costs associated with a construction project. These estimates are crucial for budgeting, scheduling, and managing resources effectively. Below are the methods and steps involved in preparing a detailed construction estimate:

1. Details of Measurements and Calculation of Quantities

Steps:

1. Divide the Work: Split the project into distinct work items.
2. Take Measurements: Extract dimensions from the construction drawings.
3. Enter Data: Record measurements in the appropriate columns of the measurement form.
4. Calculate Quantities: Multiply the recorded measurements to determine the total quantities for each item.

Example:

2. Abstract of Estimated Cost

Accompanying Documents for Detailed Estimate

1. Report: A narrative description of the project, scope, and objectives.
2. Specification: Detailed descriptions of the materials, workmanship, and methods to be used.
3. Drawings: Plans, elevations, and sections providing visual details of the project.
4. Design Charts and Calculations: Technical data supporting the design choices.
5. Standard Schedule of Rates: A reference for standard pricing used in the estimate.

Factors to Consider While Preparing Detailed Estimates

1. Quantity and Transportation of Materials: Bulk purchasing for larger projects can reduce costs.
2. Location of Site: Proximity to suppliers can minimize transport costs and material damage.
3. Local Labor Charges: Consider local labor availability, skills, and wage rates.

Data for Detailed Estimates

Fixing Rate per Unit of an Item:

1. Quantity of Materials & Cost: Use S.D.B. to determine material requirements, including costs for purchase, freight, insurance, and transportation.
2. Cost of Labor: Calculate labor costs based on the number of workers needed and their daily wages.
3. Cost of Equipment (T&P): Allocate 1-2% of the estimated cost for special tools and equipment.
4. Overhead Charges: Allocate around 4% of the estimated cost for expenses like office rent, equipment depreciation, staff salaries, postage, and lighting.
   Example of Rate Calculation:

By following these steps and considerations, a detailed construction estimate ensures accuracy in budgeting, resource allocation, and project planning.