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Construction Cost Estimate - Trusses and Columns

A small steel frame structure is to be erected and you are to prepare an estimate of the cost based on the data given below and the assumptions provided.

Assumptions: the unloading, erection, temporary bolting, and plumbing will be done by a crew of 1 foreman, 1 crane operator, and 4 structural steel workers with 55 ton crawler crane. The bolting will be done by 2 structural steel workers using power tools. The painting will be done by a crew of 3 painters (structural steel) with spray equipment. For unloading at site, erection, temporary bolting, and plumbing, allow 7 labor-hours per ton for the roof trusses, and allow 5.6 labor-hours per ton for remaining steel. Assume 60 crew hours will be required for bolting. Allow 1.11 labor-hours per ton for painting.

Materials A36 Structural steel Trusses 15tons
Columns, etc. 50tons

Costs: Structural steel supply: $0.22/#
Fabrication: $450/ton - trusses: $250/ton - other steel
Freight cost: $1.65/100#
Field bolts: 250 @ $0.66 each
Paint: 41 gallons @ $16/gallon
Labor costs: assume payroll taxes and insurance are 80% of labor wage, use the following:
Foreman $24.10
Crane operator $21.10
Structural steel worker $22.10
Painter $20.20

Equipment costs:
Crane $915/day
Power tools $23.40/day
Paint equipment $68/day
Move-in/out $300

Overhead: 40% of field labor cost
Profit: 12% of all costs

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Solution:
Materials:
Structural steel: 65 * 2000 *.22 = 28,600
Freight: 65 * 2000/100 * 1.65 = 2145
Field bolts: 250 * 0.66 = 165
Paint: 41 * 16 = 656
Total Materials $ 31,566

Fabrication:
Truss: 15 * 450 = 6,750
Frame: 50 * 250 = 12,500
Total Fabrication $ 19,250

Labor ...

Solution Summary

The solution has detailed step by step calculations of all the components of the construction cost estimate. Equipment costs are provided for the trusses ad columns.

$2.19