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Tapping Quantities from BIM
Ir Francis LEUNGDirector / Head of BIM
11/9/2013
How long do you need to measure … ?
� No. of Blocks = 10
� No. of Units = 963
� Total Floor Area?
� Long list of Floor Area of Units?
� List of Floor Area of Blocks?
� Floor Area of Different Usages?
� External Wall Area with Different Types?
2 WEEKS or 2 DAYS
How long do you need to measure … ?
� Complex Site Formation …
Net Cut
375,000 m³
Does the client want to … ?
SAVE
45,000 m³(12%)
How long do you need to measure … ?
Which one do you like?
� Get the Quantities quickly
� Get the Correct Quantities
� Get the Correct Quantities quickly
Are the numbers CREDIBLE?
Typical BIM Objectives
3D Geometry
3D Geometry
Design /
Scheme Study
Design /
Scheme Study
Drawing
production
Drawing
productionQuantity
Take-off
Quantity
Take-off
Typical BIM Objectives
Design /
Drawing
Audit
Design /
Drawing
Audit
4 Factors for Credible BIM Quantities
� Source of Information
� Model Accuracy
� Modelling Methodology
� Limitation of BIM QTO
Source of Information
Originator
Drawings …
Drawings …
Quantity Surveyor
QuantitiesQuantities
Source of Information
Originator
Drawings …
Drawings …
Quantity Surveyor
QuantitiesQuantities
BIMBIM
Different Source of Information
≠≠≠≠ ≠INFO
Drawings
BIM
QTO
BIM QTO
Source of Information
Originator
Drawings …
Drawings …
Quantity Surveyor
QuantitiesQuantities
BIMBIM Credible?
Source of Information
Originator
Drawings …
Drawings …
Quantity Surveyor
QuantitiesQuantities
BIMBIM BIM QTOBIM QTO
Model Accuracy
=INFO
Drawings
BIM
QTO
BIM QTO
Modelling Methodology
Modelling Methodology
WSP Standard Method of Modelling
WSP Standard Method of Modelling
Limitation of BIM QTO
Beam side formwork?
Column side formwork?
Limitation of BIM QTO
� Don’t be shy that BIM QTO is not perfect
� BIMers must be honest to tell the limitation
� Or How to make the BIM QTO perfect
� QS must understand the what the numbers mean before it is used
4 Factors for Credible BIM Quantities
� Source of Information
� Model Accuracy
� Modelling Methodology
� Limitation of BIM QTO
QS + BIMers
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