COST Engineering: Lecture Notes Week 1: - Intro - Assignment Weighting - Importance of COST in Eng Week 2: Quantity Takeoff Estimating: Close, not precise - Count and Price every thing in a project - Transurban has messed up - Cost and Time Estimates - Forecasting Results - Priced in a Bill of Quantities > Tender Sample Bill Of Quantities 1 2 Description . . 1.0 Preliminaries, site establishment & demobilisation Procast Concrete wall panels Supply & install 34 No. 150mm precast concreto panels 2.5m W[max) x 6.5m high to Warehouse 4.13 (exclude major openings) 454 Supply & install 2 No. 150mm precast concrete panels 2.5m (max)x4.5m high to Truck washdown 4.14 bay Supply & install 14 No. 125mm precast concrete panels 2.5m W(max) x 4.5mhigh to Office (area 4.15 excludes major openings) 103 Supply & install 2 No. 125mm precast có 4.16 panels 0.975mx3.0m high to Office e 5.0 Steelwork delivery & erection Supply & install 4 No.460UB75 portal frames to 5.01 Warehouse including base plates and gussets. 1.71 5.02 Supply & install 250PFC to Warehouse Supply and install 150NB CHS 5 struts to 5.03 Warehouse 0.99 5.04 Supply & install 20dia bracing to Warehouse 0.33 Supply & install Lysaght C20019 purlins to 5.05 Warehouse Supply & install 4 No. 310UB32 roof rafters to SAMPLE BILL OF QUANTITIES MEASURE 3 4 S Sell Price Quantity Unit Rate Amount . . . . € m2 193 $ 87,622.00 23 m2 193 4,439.00 Concise descriptions of the work expressed in 'Noun & Verb' form ("supply this; do that") 6 1.05 t 4,530 15 4,756.50 - 4,850 $ 4,801.50 5,860 $ 1,875.20 247 lineal m 34.00 8,398.00 Australian Cost Engineering Society a Technical Society of Engineers Australia 3 1. Owner's and Contractors Perspective - Concerned with building the project - Initial Capital Cost - Budget with little definition - Subsequent Operation Costs - Maintenance Costs - Income Generation from facility - Sale or disposal of asset at end of life -> Planning - Accuracy of 5% > now more like 20% > Firm price tender for project > Design completed -> Plan and Schedule major work items 2. Quantity Take-off - Process o Planning - Work Plans, timing, resourcing o Take-off - Measurement and catalogue of quantities -- -- -- --
o Costing - Calculating Expected cost of quantities o Pricing - Calculate the selling price in a tender (to make a profit) - Precision and Accuracy o Precision = No. of Units e.g 6.00000001 · GIGO - Unrealistic precision - Very far from reality, wildly wrong · Don't go on a frolic! o Accuracy = How close to real value Precision vs Accuracy Low Accuracy High Precision High Accuracy Low Precision Take off - take all things from drawing specifications Methods of Measurement - AS1181-1982 Methods of measurement of civil engineering works and associated building works - gives guidance 3. Costing Directs - Calculating expected cost of quantities o Direct Costs: Sum of calculated quantities and costs in: " Direct Labour