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David Mitchell
1. 5D BIM: Today’s Workflow for Cost Certainty
3rd Annual BIM Summit
Sydney 26th August 2013
2. Discussion
How Uncertain are Construction Costs?
What Level of Certainty can be Achieved?
How do I Create Savings?
What Skills does a 5D QS need?
5D BIM Execution Plan
Deliverables SCUH
4. How Uncertain is the Market?
Research by Evans & Peck, University of Melbourne (2009)
• Victorian alliance projects
• Average cost increases:
• Business Case v TOC +35 - 45%
• TOC v Final Cost +5 – 10%
Research by Flyvbjerg et al (2003)
• 258 projects in 20 nations
• 90% of projects had cost overruns
• Average cost increase +28%
Source: “In Pursuit of Additional Value” - Evans & Peck + The University of Melbourne,Oct 2009
: http://maxwellsci.com/print/rjaset/v5-2621-2629.pdf
10. Head Contractors v Sub Contractors
83.0% Subcontract
14.0% Head Contractor -
Preliminaries
1.2% Head Contractor -
Overheads
1.8% Head Contractor -
Profit
15%
Profit
68% Labour &
Materials
Source: Mitchell Brandtman
11. Who Owns the Savings?
Source: Mitchell Brandtman
Designer Owner
D&C
Contractor
D-B-B
Contractor
D&C
Subcontor
D-B-B
Subcontor
LOD 100 CONCEPT DESIGN
Functional efficiency
Mass and form optimisation
LOD 200 SCHEMATIC DESIGN
Design workflow efficiency
Alternative methods & systems
LOD 300 DEVELOPED DESIGN
Design workflow efficiency
Alternative materials & products
Accurate contract documents
LOD 300 "FOR CONSTRUCTION"
Accurate "for construction" documents
VDC - Construction scheduling, operations &
LOD 400 CONSTRUCTION
Administrative workflow efficiency
Site efficiency
Risk reduction
LOD 500 OPERATION
Administrative workflow efficiency
Materials & equipment optimisation
PHASE & SAVING TYPE
SAVING OWNERSHIP
headcontractlet
subcontractlet
White No ownership
Red Low ownership
Orange Medium ownership
Yellow High ownership
Green Complete ownership
12. Design & Bid Pre-Construction (1 month) Construction
Arch
LOD 300
Struc
LOD 300
QS
Model
Map
MEP
LOD 200
4D Info
5D
Info
MEP
LOD 300
Steel
LOD 400
Prefab
LOD 400
4D
Time
5D
Costs
Designers -
Coordination &
Clash
Builder -
Coordination,
Clash, Activities &
Rates
StartConstruction
For
Tender
Federated
Model
For
Construction
Federated
Model
Plan to Build & Nominated SC
SelectPreferredBid
13. Lean Construction & BIM
• Waiting – for materials or specifications
• Over Production – producing more than is required
• Rework – any work that has to be rectified
• Inventory – too much or too little inventory
• Transportation – double handling and moving equipment or materials
Source: "Recommended Practices for the Application of LEAN ConstructionMethods to
Building New Australian LNG Capacity"by Engineers Australia (Western Australia
Division)
