Please comply with the Lean Construction Institute’s Usage Policies and Attribution Guidelines at http://www.leanconstruction.org/usage.pdf

when using this file. Thank you.

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