750
Cost and Time Analysis: Life Cost
Applying the trade-off factor described in Section 752.2.1 above, the
annual savings of $.25 per OGSF would pay for .25 per OGSF of
additional first cost in forty years.
752.5
MAJOR ALTERATIONS
752.5.1
To obtain some measure of how the Prototype Design might affect the
cost of major alterations, a cost estimate was made for a hypothetical
alteration to the Example Service Module Design (Section 743). The cost
assuming conventional design and construction (Table 750-2) was
compared with the cost assuming a systems application (Table 750-3). In
dollars per gross square foot, the systems cost was .54, whereas the
conventional cost would be .86. The difference of .32 represents a
savings of 18.6%.
A similar estimate was made for the Phase 2 study, analyzing an
alteration to a GM & S nursing ward. (See Section 361.2 of the Phase 2
report.) In that case, the saving was 42%.
If actual alteration costs averaged 20% less than with conventional design
and construction, the average annual cost of
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.09 per OGSF calculated
for this item in the eleven-hospital study (Section 752.3.4) would be
reduced by $ .22. This can be considered a conservative figure because
the frequency of demand for changes and the complexity of the types of
change required may be expected to increase steadily over the
foreseeable future. Also, the actual construction cost escalation rate over
the last few years has been much higher than the four percent used in the
calculations.
Application of the 17:1 trade-off factor results in an equivalent first cost of
.74 per OGSF which can be justified by this saving in forty years.
752.5.2
The cost estimate in Table 750-2 is based on the following assumed
conventional conditions:
1. Structural metal studs with metal lath and plaster over lead-lined
plywood for shielded walls.
2. Sheet metal studs with metal lath and plaster for other partitions.
Corridor partitions extend from slab to slab.
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