# approximate quantities

opic 2

Introduction to Approximate Quantities

Topic No. 2

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INTRODUCTION TO APPROXIMATE QUANTITIES

CONTENTS

INTRODUCTION.............................................................................................................2

LEARNING OUTCOMES FROM THIS TOPIC..............................................................2

APPROXIMATE QUANTITIES.......................................................................................2 General details ..................................................................................................................2 Practical application .........................................................................................................3 Advantages of using approximate quantities.................................................................4 Disadvantages...................................................................................................................5 Sources of data..................................................................................................................5 Cost checks........................................................................................................................5 Example.............................................................................................................................6 Procedure ..........................................................................................................................6 Examples ...........................................................................................................................7

REFERENCE LIST FOR THIS TOPIC..............................................................................7

APPENDICES ...................................................................................................................8 Appendix 1 - Summary of NPWC elements ...................................................................8 Appendix 2 - Sample of bill measurement paper ...........................................................8 Appendix 3 - Typical approximate quantities items ......................................................8

© Curtin University of Technology, 1999

School of Architecture Construction and Planning

T2 / 1

(17/09/99)

Introduction to Approximate Quantities

Topic No. 2

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INTRODUCTION

The cost planner is required to provide accurate costings, often based on limited information. He or she is provided with several tools that can be used to establish costings. These were discussed in Building Economics 343. In this unit we will be looking at the practical use of two techniques: approximate costing and elemental estimating. It is important for the cost planner to be able to know when and particularly how to use these two techniques. This topic will introduce the use of approximate quantities and prepare the student to undertake a practical measurement and pricing exercise.

LEARNING OUTCOMES FROM THIS TOPIC

Having attended lectures and undertaking the appropriate reading it is expected that you will be able to offer answers to the following questions: •

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What is meant by the term approximate quantities

When and how should they be used

What are the advantages and disadvantages of using approximate quantities. What is the process for undertaking a costing using approximate quantities.

APPROXIMATE QUANTITIES

General details

Students were first introduced to the technique of approximate quantities in Building Economics 343. In this first section of the Topic notes we will review some of the general details about the use of approximate quantities. •

approximate quantities represent composite items which are measured by combining or grouping together typical bill-measured items (Ashworth, 1994, p84)....

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