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