450
Cost Estimating: Target Costs
452
TARGET COSTS
The "target" costs given at the end of the description of each integrated
subsystem, and discussed in more detail in Section 751.2, are rangers
that represent the least and most each subsystem can be expected to cost
depending on the generic design options chosen and the complexity and
quality of the detailed design. All cost figures are in dollars per outside
gross square foot of building area (OGSF), are based on a stated scope,
include general contractor's and subcontractors' overhead and profit, and
are derived from costs prevailing in the San Francisco area at a national
ENR Building Cost Index of 960.
As soon as a generic design option is selected for a particular
subsystems, a more accurate determination of the appropriate target costs
is possible. If these selections can be made during preliminary planning,
the more realistic targets can be applied to cost estimates of various
alternative schematic designs, thus rendering the identification of the
optimum design more reliable. At the latest, structural, ceiling and HVC
generic design options should be selected early in the design development
phase.
In addition to the OGSF figures given, target costs in subsystem units are
provided for ceiling and partitions. Thus ceiling costs can be estimated on
the basis of total ceiling area, rather than building area, and partition costs
can be estimated from linear foot calculations.
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