228 CHAPTER TWENTY-ONE
Div. Item Old Project Adjustment New Project
3 Under-Slab Gravel 8,989 0.923 8,297
3 Footing and Foundation 63,067 0.833 52,535
3 Slab Floor 32,364 0.923 29,872
3 Light-Weight Concrete 15,685 0.923 14,477
3 Rebar 8,528 0.833 7,104
4 Masonry 48,764 0.833 40,620
5 Misc. Steel 37,524 1.000 37,524
6 Rough Carpentry 213,596 0.923 197,149
6 Lumber 241,461 0.923 222,869
6 Trusses 37,011 0.923 34,161
6 Finish Carpentry 27,269 0.923 25,169
7 Waterproofing 4,707 0.833 3,921
7 Insulation 18,767 0.923 17,322
7 Firesafing 2,946 1.000 2,946
7 Stucco 45,173 0.833 37,629
7 Siding 66,127 0.833 55,084
7 Rain Gutters 5,138 0.833 4,280
7 Roofing 20,367 0.923 18,799
8 Metal Doors and Frames 18,532 1.000 18,532
8 Wood Doors 63,912 1.000 63,912
8 Hardware 20,846 1.000 20,846
8 Windows 25,493 1.000 25,493
9 Drywall 178,426 0.923 164,687
9 Carpet & Vinyl 70,195 0.923 64,790
9 Paint 36,085 0.923 33,306
9 Window Sills 2,024 1.000 2,024
10 Wire Shelving 8,299 0.923 7,660
11 Appliances 66,906 1.000 66,906
12 Cabinetry & Counter Tops 106,736 1.000 106,736
12 Window Treatments 5,632 1.000 5,632
15 Plumbing 135,093 1.000 135,093
15 HVAC 137,278 1.000 137,278
16 Electrical 135,677 1.000 135,677
17 Clean-Up 6,454 1.000 6,454
Subtotal 1,915,071 1,804,784
Square Footage 26,000 24,000
Cost per Square Foot 73.66 75.20FIGURE 21.1.Apartment Costs. In Square Foot Costs,RS Means publishes square footage
cost data for different types of construction projects. Fig-
ures 21.2 and 21.3 show the RS Means square foot data for a
warehouse. Using this book, the estimated costs for a con-
struction project may be determined by the following steps:
- Find the correct page for the type of construction to be
estimated. Figures 21.2 and 21.3 are for a warehouse. - Determine the base cost per square foot by finding the
type of exterior wall and frame system in the left two
columns and the area in the top row of Figure 21.2. For
example, the base cost is $75.10 per sf for a 30,000-sf
warehouse with a concrete block exterior that uses the
exterior walls as bearing walls. When the size falls
between two sizes on the page, the estimator should
interpolate between the two sizes. For example, the base
cost per square foot for a 33,000-sf warehouse with a
concrete block exterior that uses the exterior walls as
bearing walls would be determined as follows:3.Next, the base cost per square foot needs to be adjusted
for differences in the perimeters. This is done by deter-
mining the difference between the proposed building’s
perimeter and the perimeter specified in the second
row of the table. The differences are measured in 100
or a fraction thereof. For example, for a 30,000-sf ware-
house, the perimeter is 700; and if the proposed build-
ing’s perimeter is 680, the difference in the perimeters
would be 0.2 hundred feet, which would be a deduction
because we are reducing the perimeter. This is multipliedCost ($>sf)$74.23Cost ($>sf )33,00030,000
35,00030,000($73.65$75.10)$75.10