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The Most reliable estimate is
Preliminary estimate
Plinth area estimate
Detailed estimate
Cube rate estimate
Detailed estimate
A detailed estimate is the most reliable estimate because it involves the calculation of quantities of each individual item of work based on detailed drawings and specifications. It provides an accurate cost breakdown by multiplying these exact quantities with the corresponding unit rates.
A detailed estimate is the most reliable estimate because it involves the calculation of quantities of each individual item of work based on detailed drawings and specifications. It provides an accurate cost breakdown by multiplying these exact quantities with the corresponding unit rates.
TotalCost=тИС(QuantityiтАЛ├ЧRateiтАЛ) тАФ The foundational formula for a detailed estimate.
Error%=ActualтИгEstimatedтИТActualтИгтАЛ├Ч100 тАФ Metric to evaluate the reliability of different estimation methods.
The process begins with the preparation of a bill of quantities derived from detailed blueprints. Each item is itemized, and market rates are applied to determine the total project cost, accounting for labor, materials, transport, and overheads.
Detailed estimates are prepared for the purpose of technical sanction and floating tenders.
They incorporate the cost of all items including electrical, plumbing, and finishing works.
The accuracy level is typically within ┬▒5% of the actual expenditure.
It requires complete drawings: plan, elevation, section, and structural details.
High accuracy for budget control
Essential for procurement and contract management
Allows for systematic project monitoring
Time-consuming to prepare
Requires professional expertise
Dependent on the availability of final working drawings
Construction project tendering
Bank loan appraisal
Final budget allocation
| Feature | Preliminary | Detailed |
|---|---|---|
Accuracy | Low | High |
Requirement | Rough layout | Working drawings |
Preliminary estimates (or approximate estimates) are used for administrative approval, not for actual construction planning.
Plinth area and cube rate estimates are based on superficial measurements and historical data, making them less precise than detailed item-wise estimates.
C is correct тАФ The detailed estimate is the most reliable as it is calculated using precise quantities and unit rates based on comprehensive engineering drawings.
Always remember that reliability in estimation is directly proportional to the amount of information available regarding the project specifications and dimensions.