W1- Cost data (f)
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Transcript of W1- Cost data (f)
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QSM 556 Construction Economics II 1
UNIVERSITI TEKNOLOGI MARA QSM 556
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AIM HIGH!
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QSM 556 Construction Economics II 3
UNIVERSITI TEKNOLOGI MARA QSM 556
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By end of this class, you should: Understand the importance of Cost data
The usage of Cost Data
The sources of Cost Data
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Introduction Why is it important? - At initial stage to reflect the
probable cost of the proposed project to the client and throughout the various stages of design and construction.
Where can I get cost data? - Generally, QS consultants, ISM, PWD, the Statistics Department and CIDB have ample cost data which are kept systematically.
QSM 556 Construction Economics II 5
In a NUTSHELL: For forecasting and control activity.
Which cost information should we use and where it comes
from is important!
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“...the planning and design phase of a building project deserves more abundant resources and closer attention because in this phase we simultaneously encounter the greatest possibilities for influencing the total project cost and the lowest expenditures associated with the project.”
Building Cost Planning for the Design Team, by Jim Smith & David Jaggar
QSM 556 Construction Economics II 6
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How cost planning influence cost?
QSM 556 Construction Economics II 7
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QSM 556 Construction Economics II 8
Components of Cost
Plant & Equipment
Plant Hiring rates?
LabourWages per
day?
Material Cement-
RM?/50kg
Overhead5-10% of total cost
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Purpose? Approximate estimate cost of the proposed project
Balance the cost in the estimate to assure money is spent based on the client’s preferences.
As a basis for preparing schedule of rates for the purpose of variations of work, contractor’s claim and final account.
QSM 556 Construction Economics II 9
UNIVERSITI TEKNOLOGI MARA QSM 556
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Uses of Cost Data
To?
Predict Cost
Make cost comparison
Balance the cost
Analyse the cost trend
QSM 556 Construction Economics II 10
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a. Prediction of cost
Prediction of total cost of construction based on data available and the suitability of the data
ALERT! Data must be an updated set of data- historical data must be adjusted for current analysis.
Current predicted Cost
BQ from prev.
project
Schedule of rates
Cost/m2
QSM 556 Construction Economics II 11
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b. To make comparison of cost
Not merely to obtain the actual but to make the best comparison on alternative item/element that have similar functions/different in design.
Pitched Roof vs. Flat Roof?
QSM 556 Construction Economics II 12
Brickwall vs. Curtain Wall
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c. Balancing of costCost per element orsmall units can be usedto conduct cost check.
Can be used inestimation todistribute cost basedon client’s needs.
QSM 556 Construction Economics II 13
Cost per/m2 of upper
floor?
Total cost for ceiling?
Total cost for Roof?
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The element of cost of a building changesthrough time.
By using cost data, the trend of future changes can be forecast to accommodate client financial status. (i.e the hikes of materials price or wages for labour)
Construction of a Stadium
Construction stop-
financially incapable
d. Analysis of cost trend
2008- Steel price increased
Construction Start- 2007
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Why QS need readily available cost data?? To prepare an estimate or budget
Plan outline and detailed costs during the design stages
Estimates tender for tendering purposes
Negotiate variation prices during the preparation of final account
Calculate and settle off the contractor’s claims
Adjust valuation of profit & loss
Manage maintenance & repair
Calculate the life cycle cost or cost in use
Du
ring
Co
nstru
ction
Post construction & for future
project
From Start of Project
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1. Technical data Published in Journal &
Magazines (Building related)
Information on- price of materials, labour wages, hire-purchase of plant.
ISM- ‘The Malaysian Surveyor’ magazine [ECA, etc]
Advantage: more frequent up-to-date
information, applicable locally.
Disadvantage: not much space (articles
etc) therefore less details of cost
information
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2. Price books In UK-Published annually- but not
yet available in Malaysia.
Some priced books can be referred to.
i.e. Spon’s Asia Pacific Construction Costs Handbook- contains price information for the Asia Pacific countries including Malaysia
Advantages: Organized & Comprehensive set of cost data
Disadvantages: Need to be updated by users periodically due to changes of market conditions, location etc
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Spon’s Asia Pacific Construction Costs Handbook, 2000 (3rd Ed.)
Labour Types Wages for 8 hours/day(RM)
Total number of working hours per
year
Mason/Bricklayer 80.00 2304
Carpenter 80.00 2304
Plumber 80.00 2304
Electrician 80.00 2304
Semi-skilled labour 35.00 2304
Unskilled labour 30.00 2304
Plant operator 80.00 2304
Per month
Foreman 2,600.00 2304
Clerk-of-work 1,800.00 2304
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3.Information services
Building Cost Information Services (BCIS) under RICS.
Published price books
AND Online data base for users in UK: http://www.bcis.co.uk
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4. Tender/Contract Doc & BQ
MAIN SOURCES used by QS
Preferable at all times than published information thus knowledge on site condition, market prices, labour condition is required prior to the use of information.
In forms of: Schedule of rates, overall costs, basic rate of materials, labour, plant, contract period, and DL period.
ALERT! Different contract usually consist of different rates-thus-must inspect the factors that influence the differences. (i.e.- location, size, market condition, tendered &contract period)
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Why BQs rates differ?
Factors?
LocationUrban Vs
Rural?Accessibility
Front/Back loading
Capital firstVariations
later
ErrorsMany items
to pricedVery
common
Inaccurate data
Time pressure
Historical Vs Updated
Site techniques
High out put Machinery?
Special techniques
Supply of Material
Own product
Sub-to supplier
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5. Government Publications
In Malaysia-Government is the main client in the construction industry-thus has its own production of cost data and R&D
JKR (PWD), Department of Statistics (DSM), CIDB.
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Cost Data available online
http://www.statistics.gov.my (go to free
Download tab)
http://www.cidb.gov.my (under Resources-
>Construction Resource Centre)
http://www.jkr.gov.my (under Info Contrak-
Jadual Kadar Harga)
24QSM 556 Construction Economics II
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25QSM 556 Construction Economics II
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26QSM 556 Construction Economics II
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Conclusion: Do you understand the importance of Cost data?
Very important during design stage, especially to influence the cost, to do approximate costing, and
What are the purposes and how to use Cost Data?
What are the sources of Cost Data?
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Discussion: What are the main source of cost data for quantity
surveyors, and why precautionary steps must be taken when using this source?
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Past years exams Q:Some of the factors which may influence the cost data obtained from Bills of Quantities are:
i. Size of project
ii. Method of tendering
iii. Construction period
iv. Site location
v. Government policy
Discuss and give appropriate situations how each of the
factors affect the rates entered by contractors during
tendering exercise.