7/28/2019 Project Management Lecture Note 5A - Estimating

1/8

Estimating

Estimating Methods

Unit MethodExample : Number of beds in a hospital

Number of seats in a cinema

Number of bedrooms in a hotel

Number of parking lots in a car park

Advantages

Provides a convenient form of stating a cost limit

Provides a simple method of comparing a different schemes

Speed of application

Disadvantages

Lack of precision

Unsuitable for estimating the cost of individual building and different buildings

Difference in time excluded

Location of the site excluded

Method of construction excluded

7/28/2019 Project Management Lecture Note 5A - Estimating

2/8

Superficial Method

Is the most popular method of approximate estimating. Total building cost divided by

total floor areas.

Advantages

Simple method, easiest to remember

Rapid method, widely used by architect and QS

Easily understood by employer

Wide availability of data

Disadvantages

Building must be of similar shape, size, heights and specifications

7/28/2019 Project Management Lecture Note 5A - Estimating

3/8

Approximate Method

Is considered to be the most reliable and accurate method of approximate estimating.

Advantages

An estimate can be divided into individual items or elements which assist the

development of a balance designed.

Adjustments can be made to a estimate for specification changes and

other reasons with the minimum fuss or disturbance.

Disadvantages

Requires detailed specifications and method statements

Requires detailed materials and labour costs

Time consuming

7/28/2019 Project Management Lecture Note 5A - Estimating

4/8

7/28/2019 Project Management Lecture Note 5A - Estimating

5/8

7/28/2019 Project Management Lecture Note 5A - Estimating

6/8

7/28/2019 Project Management Lecture Note 5A - Estimating

7/8

Estimate the Quantities of:

Earthwork in excavation in foundation

Concrete in foundation

Brickwork in foundation and plinth Brickwork in superstructure

7/28/2019 Project Management Lecture Note 5A - Estimating

8/8

Details of Measurement and Calculation of Quantities

No Particular No Length Width Depth Quantity Note

1 Earthwork in excavation

in foundation

Long walls 2 6.2 0.9 0.9 10.04 Length =5.3+0.9=6.2m

Short walls 2 3.4 0.9 0.9 5.51 Width=4.3-0.9=3.4m

Total 15.55 cu.m.

2 Concrete in

foundation

Long walls 2 6.2 0.9 0.3 3.35 Length =5.3+0.9=6.2m

Short walls 2 3.4 0.9 0.3 1.84 With=4.3-0.9=3.4m

Total 5.18 cu.m.

3 Brickwork in

foundation and plinth

Long walls

1st footing 2 5.9 0.6 0.3 2.12 length=5.3+0.6 = 5.9m

2nd footing 2 5.8 0.5 0.3 1.74 length=5.3+0.5 = 5.8m

Plinth walls 2 5.7 0.4 0.6 2.74 length=5.3+0.4 = 5.7m

Short walls

1st footing 2 3.7 0.6 0.3 1.33 length=5.3-0.6 = 3.7m

2nd footing 2 3.8 0.5 0.3 1.14 length=5.3-0.5 = 3.8mPlinth walls 2 3.9 0.4 0.6 1.87 length=5.3-0.4 = 3.9m

Total 10.94 cu.m

4 Brickwork in

superstructure

Long walls 2 5.6 0.3 3.5 11.76 Length =5.3+0.3=5.6m

Short walls 2 4 0.3 3.5 8.40 With=4.3-0.3=4.0m

Total 20.16 cu.m.