Cost Estimation Techniques - Cost estimating techniques

6 important questions on Cost Estimation Techniques - Cost estimating techniques

Estimating techniques | Unit technique

Gives
  • Explanation of the unit technique;
  • Some examples;
  • when it is applied;

Unit technique involves a 'per unit factor' that can be estimated effectively.

  • Revenue per mile
  • Capital cost per installed connection
  • Revenue per customer served
  • Operating cost per mile
  • Construction cost per square foot.  


Usefull in preliminary estimates.

Estimating techniques | Factor technique

Give;
  • Explanation of the factor technique
  • Formula used

Extension of the unit technique where the products of several quantities are summed and then added to components estimates directly.

Estimating techniques | Indexes

Give the definition of an index 

Index is a dimensionless number that indicates how a cost or a price has changed with time (typically escalated) with respect to a base year.
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Estimating techniques | Indexes

What do indexes provide?

Provide a means for developing present and future cost and price estimates from historical data.

Estimating techniques | Indexes

Give the formula for indexes considering multiple items.

See image.

Estimating techniques | Lang Factor Technique

Lang Factor Technique
  • Explanation;
  • Based on;
  • Formula;

Cost to build a major expansion to an existing chemical plant (chemical engineer)

Based on cost of major equipment components (heat exchangers, pumps, compressors, tanks)

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