TABLE C: SIZE ADJUSTMENT FACTORS
The Size Adjustment Factor table is based on data analysis that shows a correlation exists between project size and construction cost.
Unit construction costs generally are lower for larger projects due to greater opportunities for material quantity discounts and for
spreading mobilization, demobilization and general overhead costs over a greater number of units.
All unit costs are based on the referenced facility sizes. Use Table C, Size Adjustment Factor, to adjust unit costs for facilities
whenever your project size differs from the referenced facility size shown in Table A. Divide the gross area of your proposed facility
by the referenced size for that facility type to determine the size relationship ratio. Use this ratio to find the appropriate size
adjustment factor in Table C. Multiply the unit cost from Table A by the size adjustment factor to calculate the adjusted unit cost for
your facility, if applicable.
Base your proposed project size on the total project scope to be awarded as a single construction contract, regardless of the number of
buildings to be constructed within that scope. If a construction award project is to be broken into a number of discreet phases where
the contractor has limited control over the phasing, use the average scope for all phases as the basis for your size adjustment
calculations. In addition to using the size adjustment factors, in Table C, for enlisted dormitory (barracks) also use the project size
adjustment factors in Table C, as applicable. (See EXAMPLE below.)
EXAMPLE: You propose to build a 144 Person/Room (4,752 m2) Enlisted Barracks/Dormitory in FY05. The referenced
facility size taken from the unit cost summary is 9,250 m2. The size relationship ratio is 0.51 (4,752 m2 divided by 9,250
m2). Enter Table C to find the Size Adjustment Factor of 1.08 and the project size adjustment factor of 1.03. Multiply the
unit cost of 15/m2 by 1.08 and 1.03 to determine that your adjusted unit cost is $ 1,797/m2.
EXAMPLE: You propose to build a 3,500 m2 multi-purpose administrative facility. The referenced facility size taken
from the unit cost summary is 2,300 m2. The size relationship ratio is 1.52 (3,500 m2 divided by 2,300 m2). Enter Table
C to find the Size Adjustment Factor of 0.96. Multiply the unit cost of 07/m2 by 0.96 to determine that your adjusted
unit cost is $ 1,447/m2.