Page 64 - 2018 National Home Improvement

2018 National Home Improvement Estimator, All Rights Reserved Page 48

Concrete Footings, Grade Beams and Stem Walls. Use the figures below for preliminary estimates.
Concrete costs are based on a 2,000 PSI, 5.0 sack mix with 1" aggregate placed directly from the
chute of a ready-mix truck. Figures in parentheses show the cubic yards of concrete per linear foot of
foundation including 5 percent waste. Costs shown include concrete, 60 pounds of reinforcing per CY of
concrete, and typical excavation using a 3/4 CY backhoe with excess backfill spread on site.

Concrete footings and grade beams. Cast directly against the earth, including excavation, steel
reinforcing and concrete but no forming or finishing. These costs assume the top of the foundation will
be at finished grade. For scheduling purposes estimate that a crew of 3 can lay out, excavate, place
and tie the reinforcing steel and place 13 CY of concrete in an 8-hour day. Add the cost of equipment
rental. Use $900.00 as a minimum job charge.
Using 2,000 PSI concrete, per CY --@.000 CY 116.15 -- 116.15
Using reinforcing bars, per pound --@.000 Lb 0.71 -- 0.71
Typical cost per CY B4@1.80 CY 159.58 72.40 231.98
12" W x 6" D (0.019CY per LF) B4@.034 LF 3.04 1.37 4.41
12" W x 8" D (0.025CY per LF) B4@.045 LF 4.01 1.81 5.82
12" W x 10" D (0.032 CY per LF) B4@.058 LF 5.10 2.33 7.43
12" W x 12" D (0.039 CY per LF) B4@.070 LF 6.24 2.82 9.06
12" W x 18" D (0.058 CY per LF) B4@.104 LF 9.29 4.18 13.48
16" W x 8" D (0.035 CY per LF) B4@.063 LF 5.63 2.53 8.16
16" W x 10" D (0.043 CY per LF) B4@.077 LF 6.89 3.10 9.99
16" W x 12" D (0.052 CY per LF) B4@.094 LF 8.31 3.78 12.09
18" W x 8" D (0.037 CY per LF) B4@.067 LF 5.92 2.70 8.61
18" W x 10" D (0.049 CY per LF) B4@.088 LF 7.86 3.54 11.40
18" W x 24" D (0.117 CY per LF) B4@.216 LF 18.89 8.69 27.58
20" W x 12" D (0.065 CY per LF) B4@.117 LF 10.40 4.71 15.11
24" W x 12" D (0.078 CY per LF) B4@.140 LF 12.42 5.63 18.05
24" W x 24" D (0.156 CY per LF) B4@.281 LF 24.85 11.30 36.15
24" W x 30" D (0.195 CY per LF) B4@.351 LF 31.31 14.12 45.43
24" W x 36" D (0.234 CY per LF) B4@.421 LF 37.47 16.93 54.40
30" W x 36" D (0.292 CY per LF) B4@.526 LF 46.66 21.16 67.82
30" W x 42" D (0.341 CY per LF) B4@.614 LF 54.54 24.70 79.24
36" W x 48" D (0.467 CY per LF) B4@.841 LF 74.54 33.83 108.37
To estimate the cost of footing or grade beam sizes not shown, multiply the width in inches by the
depth in inches and divide the result by 3700. This is the CY of concrete per LF of footing including 5
percent waste. Multiply by the “Typical cost per CY” in the prior table to find the cost per LF.

Continuous concrete footing with foundation stem wall. These figures assume the foundation stem
wall projects 24" above the finished grade and extends into the soil 18" to the top of the footing. Costs
shown include typical excavation using a 3/4 CY backhoe with excess backfill spread on site, forming
both sides of the foundation wall and the footing, based on three uses of the forms and 2 #4 rebar. Use
$1,200.00 as a minimum cost for this type work. Add the cost of equipment rental.
Typical cost per CY B5@7.16 CY 183.82 285.40 469.22

Concrete footing and stem wall for single-story structure.
Typical single-story structure, footing 12" W x 8" D,
wall 6" T x 42" D (.10 CY per LF) B5@.716 LF 18.38 28.54 46.92

Concrete footing and stem wall for two-story structure.
Typical two-story structure, footing 18" W x 10" D,
wall 8" T x 42" D (.14 CY per LF) B5@1.00 LF 25.65 39.86 65.51

Concrete footing and stem wall for three-story structure.
Typical three-story structure, footing 24" W x 12" D,
wall 10" T x 42" D (.19 CY per LF) B5@1.36 LF 34.85 54.21 89.06