5D BIM: Creating Cost Certainty & Better Buildings · Variations (5 Claims) + 2% Source:...

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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