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M d l B d E ti ti t t Model Based Estimating to support Target Value Design Process
Saurabh TiwariDPR Construction, Inc.DPR Construction, Inc.
COST TRACKING FOR TARGET VALUE DESIGN
Project Cost Type
70%
80%
90%
100%
Co
st
Project Cost Type
20%
30%
40%
50%
60%
% o
f To
tal C
Conceptual Estimate
Manual/Model Based Estimate
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
0%
10%
Project Time Line
Cost Types Model
T di i l Traditional Conceptual
As design becomes more certain, cost is driven from ,project specific design elements rather than conceptual costs (unit costs)
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
Why Model based Estimating ?
Data Assumed
Manual Mappingwith cost assemblies
2D dwgsHand Takeoff
Manual Estimate(4 weeks)
Data Lost
Manual Estimating Process
Data Used
BIM Automated Mappingwith cost assemblies
Auto Takeoff Model Based Estimate(<1 week)
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
with cost assemblies ( )
Model Based Estimating Process
DESIGN CHANGE MANAGEMENTWhy Model based Estimating ?
MAN
MANUALGreater Chances of Error:
•Missing Clouds•Missing detail sheetsU
AL
Missing detail sheets•Missing Section cuts•RETAKEOFF WHOLE SET OF DRAWINGS
MODEL
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
MODEL BASED ESTIMATING PROCESS
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
MAIN VALUE ADDING ADDING FEATURE:
MAPPING Cost MAPPING Cost Assemblies with 3D Model Components
Mapping Mapping remembered (done only once)
Auto‐takeoff Auto‐takeoff (automated cost feedback on updated model )
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
COST TRACKING CHART FORTARGET VALUE DESIGN
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
INDIVIDUAL CLUSTER REPORT
Link with cost
1 week
approved
1 week
Estimate updatesModel updates Target Cost
Chart Updates1 week
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
Different Modeling software call for different Estimating Platforms
Revit/AutoCAD
Innovaya/Timberline COST ESTIMATE
CADDuct/CADMech CADEST COST ESTIMATECADMech/CADPipe
CADEST COST ESTIMATE
TeklaTOCOMAN/Innovaya(in progress)
COST ESTIMATE
ArchiCAD TOCOMAN/VICO E ti t
COST ESTIMATE
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
Estimator
CHECK THE BEHAVIOR OF MODEL OVER TIME
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
OTHER BENEFITS OF MODEL BASED ESTIMATINGQuick Cost Comparison between DESIGN alternativesQuick Cost Comparison between DESIGN alternatives
CEILING HT FULL HT
Quick Cost Comparison between CONSTRUCTION alternatives
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
CHALLENGES/LESSONS LEARNED
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
Cost Breakdown: By SourceLESSONS LEARNED
Cost Breakdown: By Source
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
Challenges/Lessons Learned: Aligning Traditional Estimate with Model Based Estimate
TARGET VALUE DESIGN @ SUTTER MEDICAL CENTER, CASTRO VALLEY
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