Section 2: Individual LEED Credit Reviews
LEED Credit SS-4.4:
of required carpool spaces (determined by the
number of building occupants) can approach 25 to
Alternative Transportation
50 percent of the total (see Basis for Cost
Assumption below for an example). This ratio
Parking Capacity
should be assessed on a project-specific basis.
Basis for Cost Assumption
Intent
In new GSA Courthouses, parking is provided only
Reduce pollution and land development impacts
for judges and a limited number of court officers
from single occupancy vehicle use.
and officials. Access to parking is severely
restricted due to security concerns. Because of
Requirement
these limitations, carpooling is not considered
Size parking capacity not to exceed minimum
achievable in the Courthouse scenarios.
local zoning requirements AND provide
In the Office Building scenarios, no new parking
preferred parking for carpools or van-pools
spaces are being added. A total of 33 parking
capable of serving 5% of the building occupants;
spaces (out of 102 overall) are assigned for
OR add no new parking for rehabilitation
carpooling. A minor premium is defined for
projects AND provide preferred parking for
pavement painting and signage to designate the
carpools or vanpools capable of serving 5% of
carpool spaces. This credit is assumed to be earned
the building occupants.
in all 6 Office Building scenarios.
(1 point)
Summary of First Cost Impacts
Cost Impact = 3
Courthouse (New Construction, 262,000 GSF)
1
2
3
4
5
The credit is not applicable.
GSA
No
Low
Moderate
High
Mandate
premium,
premium
premium
premium
Office Building (Modernization, 306,600 GSF)
(no cost)
psble svgs
(<50K)
(50-150K)
(>150K)
Total Credit Cost..............................................9
Practical Applications
Cost Impact ($/GSF) ........................
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.003/GSFCost Impact (%), Min. Facade .................... 0.00%
The number of parking spaces typically developed
Cost Impact (%), Full Facade......................0.00%
in a GSA project is limited, primarily because the
majority of the projects are sited in urban locations.
In some cases, as with Courthouses, security issues
Additional Considerations
limit the amount of building-related parking that
GSA will allow. These restrictions generally keep
None identified.
GSA's parking developments at or below the levels
called for in local zoning regulations. GSA
Synergistic Credits
generally emphasizes public transit, shared parking
facilities (e.g., using existing municipal lots or
None identified (with construction cost impacts).
garages), and carpooling to compensate for
reduced parking development.
A significant consideration in pursuing this LEED
credit is the ratio of carpooling spaces relative to
the overall amount of parking provided. If the total
number of developed spaces is small, the number
GSA LEED COST STUDY
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