Types Of Estimates

Estimation can be divided into several types, namely:
- Estimation of Feasibility, to determine whether the project is feasible in the wake. Costs are taken into account in this estimate includes costs for land acquisition, design, depreciation, taxes, interest of capital, maintenance and annual repairs, and others.

- Conceptual Estimate, made ​​during the design process takes place, every place the revised estimate of precision or accuracy of the cost will increase according to the design phase.
Conceptual Estimate Types are:
1. Estimation of the Functional Unit Price, The use of the facility functions as the basis of costing
2. Estimated Unit Costs square meter, in which this method relies on data from similar projects ever built. This method has low accuracy.
3. Estimated Unit Costs cubic meters, can be used in the building where the volume is in need. This method is only reliable for the initial phase of planning and design.

4. Factorial estimation, is used on projects that have the same type. This method is very useful for projects that have the same main components. The main components of this cost will serve as the basic factor of 1.00 and the price of all other components is a function of the main components.
5. Systematically estimate, the Project is divided into functional systems and the unit price is determined from the sum of the unit price of each element in any system or transfer by a factor of existing data.

 

- Estimation Details, generally performed by a general contractor. The first step is to make Quantity Take Off is based on the working drawings and specifications da uniting material costs, labor, equipment, sub-contractors, and other costs such as overhead and profit.

- Estimation of sub-contractor system, used in the construction of a special sub-contracted

- Estimated Work Less added, where the work may not add due to owner's requirements, errors in the contract documents, or changes to the project site conditions

- Estimation of Progress, the aim being: as the basis of payment requests; as a comparison to the gains, and losses that had previously predicted.