The Project Cumulative Cost will change over the life of your project, almost always increasing. It is important to realize how the cost of certain items will vary with Quantity of Work Done or with Time passed.
Fixed Costs: Costs that are Fixed, do not change over the life of the project. Examples include
building permits, mobilization to site, and IT set-ups. These are "one-time" costs, and
are permanent for the life of the project.
Semi-fixed Costs: For part of the Work Done, or part of the Time, the cost is fixed. Then, the cost
changes; either to a new fixed cost (shown) or to a variable cost. For
example: sometimes after a project gets started, additional insurance or bonding is
required to be paid.
Variable Costs: These costs vary with the Work Done or the Time passed. Common examples are
material purchases, labour wages, and rentals.
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