Executive Summary
"high cost" scenario was defined in order to
used as the basis for bracketing the LEED
bracket the LEED costs.
Office Building costs.
The point totals used for each rating level were as
were developed at the Certified, Silver, and
follows: 28 points for a Certified rating, 35 points
Gold rating levels. At each rating level, one
for a Silver rating, and 41 points for a Gold rating.
scenario reflected a "minimal faade
These totals are purposely 2 points higher than the
renovation" (window replacement, minor
LEED minimums, as it is common practice to
repairs) and the other reflected a "full faade
submit additional credits to ensure that a rating is
renovation" (new cladding and faade design,
achieved (i.e., in the case that one or two credits are
new windows, new insulation). The different
denied during the LEED certification process with
faade scenarios reflect one of the most
the USGBC).
significant scope variations in GSA's
The construction cost impacts for the 12 rating
modernization projects and were therefore
scenarios are identified in Tables ES-1A and
ES-1B.
NEW COURTHOUSE
TABLE ES-1A
(262,000 GSF, Base Construction Cost = 0/GSF)
Certified
Silver
Gold
1A
2A
3A
4A
5A
6A
Low Cost
High Cost
Low Cost
High Cost
Low Cost
High Cost
LEED CONSTRUCTION COST IMPACTS*
$/GSF
(
||content||
.76).18
(
||content||
.07).57
.97
.79
% CHANGE
-0.4%
1.0%
-0.03%
4.4%
1.4%
8.1%
OFFICE BUILDING MODERNIZATION
TABLE ES-1B
(306,600 GSF, Base Construction Cost = 0/GSF)
Certified
Silver
Gold
1B
2B
3B
4B
5B
6B
Min. Facade
Full Facade
Min. Facade
Full Facade
Min. Facade
Full Facade
LEED CONSTRUCTION COST IMPACTS*
$/GSF
||content||
.78
.73
.94
.55
.58
.22
% CHANGE
1.4%
2.1%
3.1%
4.2%
8.2%
7.8%
* Construction cost estimates reflect a reference date of October 2003 (GSA FY04) and a reference location of Washington, DC.
The construction cost estimates reflect a number of
GSA-specific design features and project
assumptions; as such the numbers must be used
with caution. The cost impacts may not be directly
transferable to other project types or building
owners. These issues are reviewed in greater detail
in the "Cost Estimate Qualifiers" section below.
GSA LEED COST STUDY
2
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