BASIS for ESTIMATES

Post 734Gautam Shah

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QUANTITY ESTIMATES
Quantity estimates form the prime database on which monetary estimate is scheduled. Quantities estimate, help us to compound simple measures like lengths, widths, heights, weights, numbers, etc. into quantities with fewer variables. Typically a volumetric quantity is more inclusive than linear or surface quantity. Similarly a numerical estimate far more comprehensive than even volumetric estimate.

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It is generally experienced that certain form characteristics, dimensions (widths, depths etc.), etc. of parts and components remain constant not only through a project, but across projects of similar nature. Such constants are recognized and minor variables are levelled out within certain dimensional ranges. Dimensional ranges become effective in modular dimensions and through the methods of taking measurements. (See section on Modules of measurements and Modes of measurements). Modest qualitative differences are evened out through flexible and wider rang of specifications.

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There could be several levels of conversions before a quantity estimate becomes relevant. One of the most important conversions is through monetary rating. Such conversions are carried out by many different agencies, without the author or the originator of the quantity estimate being aware of it, or being informed about it.

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MONETARY ESTIMATES
Monetary estimates result out of a process called costing. Costing or cost-finding is done for the item as deliverable by a single agency, or for its parts, which have market equivalents, and so definite prices. However, where parts have no readily available market equivalents, these are evaluated for the cost of their constituent raw materials, labour and other inputs required for the assembly or construction.

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Monetary estimates are based on items or jobs which no matter how complex are, consist of only few elemental parts, or very simple tasks. The elemental parts and tasks are usually comparable to many others used in different items or situations. Elemental parts, though similar in form and constitution, acquire a unique personality depending on the position of the component in the whole, nature of use, method of installation or erection and time schedule of installation.

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In a monetary estimate, the parts of different types are categorized on the basis of external factors like a guarantee mechanism, life span, utility, depreciation, finance, cost, return, energy consumption, waste output, hazards, ecological value, replacement schedules, etc.

NON MONETARY ESTIMATES
Non monetary estimates, follow a process called Valuation. The valuation or value providing creates a basis for judgement of an item. The value may be real and may match the monetary estimate of the item. The value could be a hypothetical one based on a perceived use, commonness or exclusivity, observed affectation, future cost of acquisition or disposal, etc.

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Non monetary evaluations help define projects from many different aspects for which monetary costs are available. Yet, appropriateness and success of a design depend substantially on decisions made through such evaluations.

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Non monetary evaluations are like: Average space provided to a clerk, average area per resident in a hostel, proportion of area between rooms and a corridor, proportion of usable vs. service areas, energy consumption per user, load per bearing area, garbage outputs per resident, noise level per vehicle, water consumption per unit, etc.

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