The Influence of BIM on Quantity Surveyors

Presented by:Syukri Zulkipli

Alex Lim

Table of Content

1. BIM Introduction

2. Benefits of BIM

3. Barriers and Challenges of BIM

4. Current BIM Practice

5. Impact on QS Profession

6. Future of QS

BIM Introduction

• What is BIM?

• 3D BIM, 4D BIM, 5D BIM, 6D BIM, etc?

• Common misconception:– BIM is just a Software

– BIM will replace Quantity Surveyors

– BIM can do measurement with a single click

– BIM can generate BQ with a single click

• Building Information Modelling (BIM) is the process of generating

and managing the data of a building throughout its lifecycle

Benefits of BIM

• Collaboration– Shared single building model or several coordinated model

– Effective communication of ideas and actions

– Faster decision making process

• Visualization of Architect’s Design– Easier to establish client’s requirements

– Clients can virtually walk around their building

– Generate multiple “what if” scenarios

– Identify potential on-site problems/critical areas earlier

Benefits of BIM (cont…)

• Accurate Estimations– Quantity takeoff directly from the model– BIM requires high quality, reliable and integrated

information about the project– Reduction of human error

Barriers and Challenges of BIM

• High Initial Cost– Training, software and hardware upgrade– Especially for smaller firms– Firms are not willing to make an investment

• Lack of Standards– Interoperability issue due to different software

– Important due to the large data exchange

– Required to ensure efficient implementation

Barriers and Challenges of BIM (cont…)

• Resistance to Change– Individuals and firms have their own preferred system,

software application and processes– Companies assume that their existing system are adequate

• Legal and Contractual Issue– Issue of ownership of the building model and intellectual

property rights

– Lack of clear understanding about the roles and responsibilities

Current BIM Practice

a. BIM Applicationsb. 5D BIM– Quantity take offc. 5D BIM– Take off labellingd. 5D BIM– Cost certaintye. Golden rules of 5D BIM

Sources of information: 5D BIM Seminar at Kuala Lumpur on 22nd ~ 23rd January 2015

a. BIM ApplicationClash detection and reportDesign visualisation & studyConstruction coordination modelling

Construction phased schedule

Quantity take off Cost planning

Documentation/ specification managementDesign analysis – Energy, Solar, Wind, CFDs..Facility Management

3D

4D

5D

6D

XQuantityProduction

Rate + Location = Schedule

Quantity X Cost/Unit + Markup = Cost

b. 5D BIM– Quantity Take Off

• Third party 5D BIM software:

– Glodon

– Vico

– Buildsoft

– Autodesk Revit

– Cost X

b. 5D BIM – Quantity Take Off

5D BIM – Quantity Take off labelling

Take off the Primary quantity from BIM (e.g. Length of Beam, Length of Walls, Height of column

Extract primary quantity into work sheet

Convert primary quantity to secondary quantity for use of BQ

5D BIM – Quantity Take off labelling

• Walls:Qs Tag: Lvl1-IW-C30-150 = 7m

Location Element Type Thickness Primary Qty

Input height

Secondary Qty (BQ)

Level 1 Internal Wall

Con.Grade 30

150mm thick

7m 3m 21m2

• Columns:Qs Tag: Grd~1st-C30-300x300 = 3m

Location Element Type Primary Qty (Height)

Length Width Secondary Qty (BQ)

Ground to 1st

Column Con.Grade 30

3m 0.3m 0.3m 0.27m3

5D BIM – Quantity Take off labelling

Location Element Type Slab thickness

Primary Qty

Girth = Width + (Height-slab)x2

Secondary Qty (BQ)

Level 2 Upper floor beam

Con.Grade 30

150mm thick

10m 0.15 + (0.5 – 0.15)x2

8.5m2

• Beams (Formwork):

• Beams (Concrete):Qs Tag: Lvl2-UP-C30-150X500-150 = 10m

Location Element Type Slab thickness

Primary Qty

Input width x (depth-slab)

Secondary Qty (BQ)

Level 2 Upper floor beam

Con.Grade 30

150mm thick

10m 0.15 x (0.5 – 0.15)

0.525m3

d. 5D BIM - Cost Certainty

Quantity Take off

Supplier/ Manufacturer

Fabricated and install on site

• Lower the risk of redesign

• Creating cost certainty

d. 5D - Cost Certainty

d. 5D - Cost Certainty

d. 5D - Cost Certainty

e. Golden rules of 5D BIM

i) Accurate geometryii) Model the way it’s builtiii) Define rooms and departments correctlyiv) Give the 5D QS an early look at your model

e. Golden rules of 5D BIM

Nice to have:i) Correct model base pointii) Define objects with correct level / storeyiii) Use proper object tool (i.e. column tool)iv) Checking for objects within objectsv) Consistent naming conventions – resist

editingvi) Include a classification code

Current BIM Practice

• Other consultants provide the model?– Willingness to provide the file

– Do we trust the model?

– Is the model made in accordance to SMM?

• QS to produce the model?– Takes more time?

– Modelling and measurement at the same time

– Can be used for valuations

– Can be used for future purposes

Impact of BIM on QS

• Are QSs still required?– Automated quantity takeoff and BQ Production– Other profession to undertake QS role?– BIM does not produce BQ with a single click– Assist the cost estimating process– Would other profession want to take

responsibility?

Future of QS

• The role of QS will continue to evolve

• BIM and ICT will have a great impact

• Important to understand our core competencies

• How much of the changes can we influence

• It is not “Why should we use BIM”

• The question should be “How do we use BIM”

Questions?