Issues concerning cost

calculation and control in

the BIM process

James FiskeDirector, Product Delivery and Operations

RICS

April 2016

• Introduction to the RICS

• BIM and its importance to the UK

• Measurement and cost calculation process in BIM

• Case study RICS HQ

• RICS key findings

• Summary

Overview

Introduction to the RICS

RICS – who we are and what we do

We are a professional body that accredits professionals within the

land, property and construction sectors worldwide

Our membership is over 100,000 qualified members and more than

80,000 students and trainees

Not just the UK - our membership spans across 146 countries

Our primary objective is the development of international standards

(property measurement, construction, ethics…)

BIM and its importance to the

UK

What is BIM?

BIM is not a single CAD programIt’s the integration of many software programs

And more importantly

The collaboration of construction professionals

What is BIM?

Why is it important to the UK?

Construction 2025

What is BIM Level 2?

Source: Bew / Richards 2009/10

What is 5D BIM?

2D

Line Drawings

3D

Object Models

4D

Time -Schedules

5D

Cost Plans / Estimates

0 - Appraisal

1 - Brief

2 - Concept

3&4 – Developed and

Technical design

6 – Handover 7 – UseRIBA

Stages

Appraisal Design Construct Operate End of Life

Project Post ProjectPre-Project

Strategic Outline

Case

Outline

Business Case

Final Business

Case

Occupancy

Evaluation

End of Life

Business CaseDecision

Gates

What is BIM?

Effo

rt / Effe

ct

Ability to

reduce costs

Cost / Effort to

make design

changes

Preferred

Design

Process

Traditional

Design

Process

Assessment and need

Procurement

Post-contract award and mobilisation

Production

Maintenanceand use

Figure taken from PAS1192-2:2013 – Copyright Mervyn RichardsFurther information

Measurement and cost

calculation process in BIM

GIFABCIS Average

Building PricesX = Total Building

Cost

Elemental

Unit QuantsBCIS Average

Elemental Rates

Or Cost Analysis

X = Total Cost

GIFABCIS Running

CostsX = Total Running

Cost

Cost Calculation from a BIM

Code Description Parameters Used Parameter Boundry

D.20. D20: EXCAVATING AND FILLING

D.20.21. Machine excavation

D.20.21.06.

Trench excavation to receive foundations, pile caps and

ground beams, depth not exceeding

D.20.21.06.B 1.00 m

D.20. D20: EXCAVATING AND FILLING

D.20.71. Timber earthwork support to firm ground

D.20.71.04.

To sides of excavation 2.00 - 4.00 m apart, depth not

exceeding

D.20.71.04.A 1.00 m

D.20. D20: EXCAVATING AND FILLING

D.20.82. Off site disposal of material arising from earthworks

D.20.82.09. Removed, including providing a suitable tip

D.20.82.09.B machine loading

E.10. E10: MIXING, CASTING, CURING IN SITU CONCRETE

E.10.12. Reinforced in situ concrete; mix C25P

E.10.12.01. Foundations

E.10.12.01.B generally

E.20. E20: FORMWORK FOR IN SITU CONCRETE

E.20.01. Formwork to general finish

E.20.01.01. Sides of foundations

E.20.01.01.C 500 - 1000 mm high

E.30. E30: REINFORCEMENT FOR IN SITU CONCRETE

E.30.11.

Bar reinforcement; high yield steel bars, BS 4449,

delivered to site cut, bent and labelled

E.30.11.05. Bars, fixing with tying wire

E.30.11.05.D 12 mm

Code Description Parameters Used Parameter Boundry

D.31. D31: PREFORMED CONCRETE PILES

D.31.20. Reinforced concrete piles

D.31.20.10.

Provision of all plant including bringing to site and removal

on completion; setting up and subsequent dismantling;

general maintenance

D.31.20.10.A average 100 Nr piles

D.31. D31: PREFORMED CONCRETE PILES

D.31.20. Reinforced concrete piles

D.31.20.20. Sectional size; 600 mm dia

D.31.20.20.A 10 m max total driven depth

D.31. D31: PREFORMED CONCRETE PILES

D.31.20. Reinforced concrete piles

D.31.20.30. Cutting off tops of piles; 600 mm dia

D.31.20.30.A total length 2.0 m

D.31. D31: PREFORMED CONCRETE PILES

D.31.20. Reinforced concrete piles

D.31.20.50. Pile tests; 600 mm dia

D.31.20.50.A working pile; maintained loading 500 Kn

<10m Length

Total Nr of piles > 1001Nr

Length x Nr

Nr

Nr

Volume

Perimeter

0.1 (t/m3) of Volume 250 - 500mm Depth

500 - 1000 mm Depth

Volume

Perimeter x Depth

Volume

2.00 - 4.00 m Length

0.5 - 1.0 m Depth

Case Study

RICS HQ

2013…

Case Study: RICS HQ

Two weeks later…

The Scan

• Four different software vendors

• One BIM model

• One set of questions

• And a tape measure…

BIM Vendor Challenge

Gross Internal Floor Area

The Results

• Many examples of BIM in new build, but not for existing

buildings

• The 3D model was incomplete and there were errors

• The model was not designed in a way that made it easy to

extract the information

– No model object for ease of measuring floor area

– Naming and coding convention used did not help

– Requirements were not agreed (e.g. no BIM Execution Plan)

• The software need inputs from professionals who understand

the appropriate measurement standards

Key Findings

What did we do about it…?

• Roles and responsibilities agreed – e.g. who is the BIM manager?

• Data / file exchange formats agreed to suit measurement

software (test them!)

• Agree data drops / exchanges and details (considering model

size!)

– Level of Detail (LoD) - Graphical

– Level of Information (LoI) – Non-graphical (spatial, performance, standards,

workmanship, certification)

• Naming and coding conventions

• Capture requirements in BEP (template provided)

• Non-compliance with agreed protocols through BIM manager

• Checking / validating outputs

Key Findings

Where to Learn More…

The BIM Toolkit

www.theNBS.com/Toolkit

Steering team

Classification

Level of Information (LOI)

Level of Detail (LOD)

www.theNBS.com/Toolkit

Links to isurv and BCIS

• The UK considers BIM as an important aspect of its

construction strategy (mandated)

• As with anything new – we are evolving – it is not perfect yet

• Tools, training and information are available to support

• Software can help but collaboration is essential

• BIM Execution Plan (BEP) is essential to agree exchange –

timing, formats, details

• BIM toolkit can help with this

• Naming and coding conventions and control of them

• Checking, checking and more checking!

Summary

Thank you for listening

www.rics.org

jfiske@rics.org