5D BIM: Creating Cost Certainty & Better Buildings
HKIS: International QS BIM Conference 2013 Hong Kong, 9th November 2013
Discussion
5D Cost Planning Case Study
What Skills does a 5D QS need?
5D BIM Execution Plan
Deliverables SCPUH
5D Cost Planning Case Study: River Quay Project, Brisbane, Australia
Layered Models – Consistency & Coordination
5D Estimating – Visualise Costs
5D Estimating – Trusted Quantities
Structural Steel Shop Drawings Structural Steel Fabrication & Erection
% 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
Final Costs & Time – Structural Steel v Entire Contract
What Skills does a 5D QS need?
Pulling Information
Improve Information – No need for QSID or Codes
Add Parameters
Mapping - Qtys & Descriptions
Mapping – BQ Level of Detail
Model Validating & Work-a-rounds
Pushing Information & Round Tripping
Revisioning – Price Negotiations & Transparency
• Revised • New • Deleted
5D BIM Execution Plan
BIM Execution Plan
Source: Mitchell Brandtman
5D QS Workflow
LOD 100 Concept & Massing
LOD 200 Approx. Geometry
LOD 300 Precise Geometry
LOD 400 Fabrication
100
300
400 to
500
200
Concept Design Elemental Estimates
Initial Timeline Pull Mass Information
Work the Concept Functional Efficiency Alternative Designs
Schematic Design Elemental Estimates
Pull General Assemblies Push Work Breakdown Structure (WBS) Codes
Push Elemental Codes
Start Living Cost Plan Map Model & Links Cost Benchmarking Alternative Methods & Systems Value Management
Developed Design Sub-element Estimates
Pull Specific Assemblies Push Sub-element & Trade Codes
Push Activity Codes
Living Cost Planning Re-map Model & Links Alternative Materials Life Cycle Costs Quantity Take-Off Analyse Construction Sequence
Commence Construction Trade Package Estimates
Complete Virtual Design & Construction Pull Sequence & Location Data
Push GL Codes Push Bid & Cost Rates
Time & Cost Integrated Model Push Expected & Effective Lives
Push Replacement & Running Costs
Source: Mitchell Brandtman
Sunshine Coast Public University Hospital
Deliverables – Visual Subcontract Qtys for Tender
Deliverables - Revisioning
• Revised • New • Deleted
Example
Results - 3D v 2D Trade Package Quantities
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
• Rehearsing estimates
• 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
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