Construction Estimating Using Excel Professor Locurcio CON4003, CVE4073, CVE5073

Performing Quantity Take Offs Work Packages Communication in the Field Counted Items Linear Components Sheet and Roll Items Volumetric Goods Quantity-From-Quantity Goods Waste

A complete list of all components needed to complete the project Includes all components including site and direct overhead Units include all common units (feet, sq. feet, yards, etc.), months, each, and lump sum

Determine all materials, equipment, and labor Build the project from the bottom up in your mind Example: Prehung Door

Related labor tasks are divided into work packages Job cost codes may be broken into multiple work packages Example: The same lumber used in different floors of a building Should match project sequence and scheduling

Foundation wall package (top) Foundation footing package (bottom) Anchor bolts are placed in concrete first, so they are part of the wall package

Estimators and workers need to communicate to prevent confusion & delays in the project Methods and procedures can differ, creating problems during assembly

Counted Items Linear Components Sheet and Roll Items Volumetric Goods Quantity-From-Quantity Goods

Simplest way to determine quantity Important to check off items already counted I don’t remommend counting repetitive items using equations show in the Excel book (????)

120 ft

Components measured by length Connected with lap or butt joints Lap portion must be counted

Distance between the start of two linear components Number = (Length / Effective Length)

3” cover 20’ rebar 24” lap 3” cover 40” footing

Components measured by area Can be butt, lap, or spaced jointed Two methods: Area and Row/Column

8ft 50ft Effective Area 8 x 18 = 128 in3 15 5/8” 3/8” 16” 8” Calculate the area of wall = ( 8’ x 12”) x (50” x 12”) = 57, 600 sq inches Blocks needed 57,600 / 128 sq inches = 450 blocks Subtract the door ( 4” x 12” ) x (7’ x 12”) = 4032 sq inches = 4032 / 128 = 31.5 = 32 Total blocks needed 450 – 32 = 418

Volume = (Length)(Width)(Height) Eqn Additional volume formulas in Appendix A Example (Concrete, Sand, Rock)

100LF Calculate volume of concrete 100” x 100’ = 10,000 SF = Area 4”/12” =.333 LF = Thickness Volume = 10,000 x = 3330 CF Volume = 3330 CF / 27 CF/CY = Order = 125 CY

Quantity estimated from another quantity Examples: 1 gal paint covers 250sf of wall 1 lb of nails covers 100sf of roofing

Unavoidable waste should be included Expressed as a percentage of calculated quantity Or…Waste = 10%.... Multiply final quantity by 1.10! Do this in Excel… just add one line item

Distance = 120 ft = 120 ft (12 in/1 ft) = 1,440 inches Spacing = 16 inches on center Number = (1,440 inches / 16 inches) + 1 = 91 studs

Book problems only ask for quantity I require…. a) Quantity… plus b) Material Cost c) Equipment Cost d) Labor Cost e) Total Cost per unit f) Overhead & profit g) Total cost h) Use Excel format

1. Identify items to be counted 2. Determine quantities needed for each item 3. Select “correct” RSMeans item – CSI format 4. Cite RSMeans line item selected 5. Use Excel columns for Material & Labor Costs 6. Note… cite units for all items  Differs from item to item  Differs from text questions 7. Determine total cost for each item 8. Sum all line item costs for materials & labor 9. Add OH & Profit at end

1.Homework due for Tuesday…. 2.Concrete Estimate… 3.No cover sheet 4.Itemize each quantity 5.Total cost in Excel format