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Transcript of David Mitchell
5D BIM: Today’s Workflow for Cost Certainty
3rd Annual BIM Summit Sydney 26th August 2013
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
How Uncertain are Construction Costs?
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
Source: Mitchell Brandtman
MB Brisbane - Financier Watching Brief
1,100 Private Sector Financed Projects: • Procurement Type:
• 64% Lump Sum • 17% Owner Builder
• Project Type:
• 54% Residential • 16% Industrial
• Cost Overruns:
• Range -13% to +321% • 1 in 4 Projects > +5%
-25.0
0.0
25.0
50.0
75.0
100.0
What Level of Cost Certainty can be Achieved?
Structural Steel Shop Drawings Structural Steel Fabrication & Erection
Final Costs & Time – Structural Steel v Entire Contract
% Change
Entire Contract:
Extensions of Time (38 No) + 57%
Variations (321 Claims) + 27%
Structural Steel Component (15%):
Extensions of Time (zero) + 0%
Variations (5 Claims) + 2%
Source: Mitchell Brandtman
How do I Create Savings?
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
Who Owns the Savings?
PHASE & SAVING TYPE
SAVING OWNERSHIP
Designer Owner D&C
Contractor D-B-B
Contractor D&C
Sub-Con D-B-B
Sub-Con
LOD 100 - CONCEPT DESIGN
Functional efficiency 100% 100%
Mass and form optimisation 100% 100%
LOD 200 - SCHEMATIC DESIGN
Design workflow efficiency 100%
Alternative methods & systems 100% 100%
LOD 300 - DEVELOPED DESIGN
Design workflow efficiency 100% 100%
Alternative materials & products 100% 100% 100%
Accurate contract documents 5% 100% 100% 100% 100%
LOD 300 - "FOR CONSTRUCTION"
Accurate "for construction" documents 5% 5% 5% 100% 100%
VDC - Construction scheduling, operations & safety 5% 17% 17% 83% 83%
LOD 400 - CONSTRUCTION
Administrative workflow efficiency 17% 17% 83% 83%
Site efficiency 17% 17% 83% 83%
Risk reduction 5% 100%
LOD 500 - OPERATION
Administrative workflow efficiency 100%
Materials & equipment optimisation 100%
Source: Mitchell Brandtman
Designer Owner
D&C
Contractor
D-B-B
Contractor
D&C
Subcontor
D-B-B
Subcontor
LOD 100 CONCEPT DESIGN
Functional efficiencyMass and form optimisation
LOD 200 SCHEMATIC DESIGN
Design workflow efficiencyAlternative methods & systems
LOD 300 DEVELOPED DESIGN
Design workflow efficiency
Alternative materials & productsAccurate contract documents
LOD 300 "FOR CONSTRUCTION"
Accurate "for construction" documentsVDC - Construction scheduling, operations &
LOD 400 CONSTRUCTION
Administrative workflow efficiency
Site efficiencyRisk reduction
LOD 500 OPERATION
Administrative workflow efficiencyMaterials & equipment optimisation
PHASE & SAVING TYPE
SAVING OWNERSHIP
hea
d c
on
trac
t le
t
sub
con
trac
t le
t
White No ownership
Red Low ownership
Orange Medium ownership
Yellow High ownership
Green Complete ownership
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
Star
t C
on
stru
ctio
n
For Tender
Federated Model
For Construction
Federated Model
Plan to Build & Nominated SC
Sele
ct P
refe
rred
Bid
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 Construction Methods to Building New Australian LNG Capacity" by Engineers Australia (Western Australia Division)
What Skills does a 5D QS need?
Pulling Information
Improve Information – No need for QSID or Codes
Add Parameters
Mapping – BQ Level of Detail
Pushing Information & Round Tripping
Negotiations & Price Transparency
• Revised • New • Deleted
Revisioning
• Revised • New • Deleted
5D BIM Execution Plan
BIM Execution Plan
Sunshine Coast University Hospital
Deliverables - Revisioning
• Revised • New • Deleted
Deliverables – Visual Subcontract Qtys for Tender
Trade Package Quantities - 3D v 2D
94% 3D
6% 2D
Source: Mitchell Brandtman
3D v 2D by Cost
61% 3D
39% 2D
3D v 2D by No of Items
Final Words
5D creates better buildings by:
• Enabling early cost decisions
• Targeting money in a transparent way
5D QS creates cost certainty by applying:
• Wisdom – know how
• Intelligence – templates, maps & data
• Technology – weekly revisioning
Download presentations and articles from: www.mitbrand.com/info/publications
Thank You