jbuyg ub gjbuhi

1. Presentation On
Estimation and its Methods
Subject Code : KCE 503
Department Of Civil Engineering
Rajkiya Engineering College Ambedkar Nagar
Under the Supervision of
Mr. Presented By:
Saurabh Verma, Akash Singh,
Rajendra Vikram, Vaishnavi
Sagar, Rani Vishwakarma,
Anshika Patel

2. Contents
•Introduction
•Purpose of Estimation
•Types of Estimation
•Methods of Estimation

3. Estimation : It is the process which guides us to determine the cost,
quantity, tools, plants and labour’s which are needed to complete the project
with in time of completion.
It includes experienced and skilled person to judge an approximate value,
cost and time of the project.
Introduction

4. Purpose of Estimation
1. To give a Reasonably Accurate Idea of the Cost : An estimate is necessary
to give the owner a reasonably accurate idea of the cost to help him decide
whether the work can be undertaken as proposed or not, depending upon the
availability of funds.
2. Estimating Materials : From the estimate of a work it is possible to
determine what materials (and in what quantities) will be required for the
work so that arrangements of the materials can be made.
3. Estimating Labour : The number and kind of workers of different categories
who will have to be employed to complete the work in the specified time can
be found out from the estimate.
4. Estimating Plant : An estimate will help in determining the amount and kind
of equipment needed to complete the work.
5. Estimating Time : The estimate of a work and past experience enable one to
estimate quite closely the length of time required to complete an item of work
or the work as a whole

5. Types of Estimation
• Preliminary Cost Estimate
• Plinth Area Cost Estimate
• Cube Rate Cost Estimate
• Approximate Quantity Method Cost Estimate
• Detailed Cost Estimate
• Revised Cost Estimate
• Supplementary Cost Estimate
• Annual Repair Cost Estimate

6. Preliminary Cost Estimate
The preliminary cost estimate is also called an abstract cost estimate
or approximate cost estimate or budget estimate. This estimate is
generally prepared in initial stages to know the approximate cost of the
project. By this estimate, the competent sanctioning authority can
decide the financial position and policy for the administration section.
The items of work include the cost of lands, cost of roads,
electrification, water supply costs, cost of each building, etc
Plinth Area Cost Estimate
Plinth area cost estimate is prepared on the basis of plinth area of building
which is the area covered by external dimensions of building at the floor
level and plinth area rate of building which is the cost of similar building
with specifications in that locality. Least accurate method.
Estimated cost of = Plinth area * Rate/m^2
project

7. Cube Rate Cost Estimate
Cube rate cost estimate of a building is obtained by multiplying plinth area
with the height of building. Height of building should be considered from
floor level to the top of the roof level. It is more suitable for multi storied
buildings. This method of estimation is accurate than plinth area method.
Approximate Quantity Method Cost Estimate
In approximate quantity method cost estimate, the total wall length of the
structure is measured and this length is multiplied by the rate per running
meter which gives the cost of the building. The rate per running meter is
calculated separately for the foundation and superstructure
In case of foundation, rate per running meter is decided by considering
quantities such as excavation cost, brick work cost up to plinth.
While in case of superstructure quantities like brickwork for wall, wood
works, floor finishing etc. are considered for deciding rate per running meter.

8. Detailed Cost Estimate
A detailed estimate of the cost of a project is prepared by determining
the quantities and costs of everything that a contractor is required to
provide and do for the satisfactory completion of the work.
It is the best and most reliable form of estimate.
Revised Cost Estimate
Revised cost estimate is a detailed estimate and it is prepared when the
original sanctioned estimate value is exceeded by 5% or more.
The increase may be due to sudden increase in cost of materials, cost of
transportation etc.
When the expenditure or any particular work exceeds the amount by
more than 10%.

9. Supplementary Cost Estimate
Supplementary cost estimate is a detailed estimate and it is
prepared freshly when there is a requirement of additional works
during the progress of original work. The estimate sheet should
consists of cost of original estimate as well as the total cost of
work including supplementary cost of work for which sanction is
required.
Annual Repair Cost Estimate
The annual repair cost estimate is also called as annual
maintenance estimate which is prepared to know the
maintenance costs of the building which will keep the structure
in safe condition. Whitewashing, painting, minor repairs, etc. are
taken into consideration while preparing annual repair estimate
for a building.

10. Methods of Estimation
The estimation of building quantities like earth work, foundation concrete,
brickwork in plinth and superstructure etc. can be worked out by long
wall-short wall method and center line method.
Long Wall-Short Wall Method :
i. In this method, the wall along the length of room is considered to
be long wall while the wall perpendicular to long wall is said to be
short wall.
ii. To get the length of long wall or short wall, calculate first the centre
line lengths of individual walls. Then the length of long wall (out to
out) may be calculated after adding half breadth at each end to its
centre line length
iii. Thus the length of short wall measured in to in and may be found
by deducting half breadth from its centre line length at each end.
iv. The length of long wall usually decreases from earth work to brick
work in super structure while the short wall increases. These
lengths are multiplied by breadth and depth to get quantities.

11. Centre Line Method :
i. This method is suitable for walls of similar cross sections. Here the
total centre line length is multiplied by breadth and depth of
respective item to get the total quantity at a time.
ii. When cross walls or partitions or verandah walls join with main wall,
the centre line length gets reduced by half of breadth for each
junction.
iii. Such junction or joints are studied carefully while calculating total
centre line length. The estimates prepared by this method are most
accurate and quick.
iv. Center line method is suitably used for estimating circular,
rectangular, hexagonal, octagonal etc., shaped building