Unit Method Estimating
The unit method estimating consists of choosing a standard
unit of accomodation and multiplying an approximate cost per unit
Estimate = Standard units of accommodation X Cost/Unit
for example:
Schools – costs per pupil place
Hospitals - costs per
bed place
Roads – per Kilometers
Car parks - costs per car space
The technique is based on the fact that there is usually
some close relationship between the cost of a construction project and the number of functional units it
accomodates. Functional units are those
factors which express the intended use of the
building better than any other. This
method is extremely useful on occasions where the building’s client requires a preliminary
estimate based on little more information than the basic units of accommodation.
The units adopted to facilitate this analysis depend on the type of project under consideration.
Site condition
Specification changes
Market conditions
Regional changes
Inflation
Using this estimating method can generate a rough estimate
quickly, but the lack of accuracy will render it of little use in the cost
planning procedure outlined earlier. However, this method ids often used to
determine the very first notion of a price in early discussions of a project
and as a crude means of comparing the known costs of differet buildings.
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