Types of estimate

1. SNS COLLEGE OF ENGINEERING & TECHNOLOGY
An Autonomous Institutions
Accredited by NBA – AICTE and Accredited by NAAC – UGC with ‘A’ & ‘A+’Grade
Approved by AICTE, New Delhi & Affiliated to Anna University, Chennai
DEPARTMENT OF CIVIL ENGINEERING
COURSE NAME:
CE8701 - ESTIMATION, COSTING AND VALUATION ENGINEERING (SNSCE)
16CE402 - ESTIMATION, COSTING AND VALUATION (SNSCT)
IV YEAR / VII SEMESTER
Topic 1 : Types of Estimate

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Types of Estimate
Preliminary
Estimate
Plinth Area
Estimate
Cube Rate
Estimate
Approximate
Quantity
Method
Estimate
Detailed
Estimate
Revised
Estimate
Supplementary
Estimate
Supplementary
and Revised
Estimate
Annual Repair
or maintenance
Estimate

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Plinth Area Estimate
.
Plinth area should be calculated for covered area by taking external
dimensions of the building at the floor level.
Corridor and other open area should not be included.
For multi storied building Plinth
Area for each storey is determined
separately.

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Difference b/n Plinth & Carpet Area

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Cube Rate Estimate
.
Cube rate estimate is again approximate estimate.
Multiplying the length, breadth and height of the building.
External length and breadth at the floor level are calculated
for the purpose.
Height should be taken from the floor level to the top of roof.
For multi storey building height
is taken from floor level of one
storey to top of next higher floor.
Cube rate estimate is more accurate
as compared to the plinth area estimate.

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Approximate Quantity Method Estimate
Structure divided into two parts
1. Foundation including plinth
2. Superstructure
Total length of walls is found out.
To find running meter rate of foundation, appx. quantities of various
items are calculated per running meter.
Similarly for superstructure appx. Quantities of brickwork, roof,
flooring etc is calculated per running meter.

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Detailed Estimate
It is the accurate estimate prepared by working out quantities of
each items of work.
It is prepared in two stages
1. Details of measurements and calculation of quantities.
2. Abstract of estimated cost – 3% to 5% of estimated cost is added
to cover miscellaneous expenditure.
Detailed estimate is prepared work-wise.

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Detailed Estimate
1. Details of measurements and details of quantities

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Detailed Estimate
.
2. Abstract of estimation cost

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Revised Estimate
Revised estimate is prepared when original sanctioned estimate is likely
to exceed more than 5%.
When expenditure on work is likely to exceed amount of administrative
sanction by more than 10%.
When there are material deviation from original proposal even though
cost may be met from sanctioned cost.
It is accompanied by comparative statement showing variations in each
item of works and reason for the same.

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Supplementary Estimate
It is the fresh detailed estimate of the additional works in addition to the
original estimate.
It is required when further development is required during the progress
of work.
Abstract should show the amount of original estimate and total amount
including supplementary amount.
The golden bridge, Vietnam

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Supplementary and Revised Estimate
When a work is partially abandoned and the estimate cost of the
remaining work is less then 95% of the original work.
That is less than 95% of original sanctioned estimate.
If any material deviations and changes in the design, which may causes
substantial saving in the estimate, Then the amount of original estimate
is revised by the competent authority.

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Annual Repair or Maintenance Estimate
It is prepared to maintain structure or work in proper order and safe
condition
For buildings like white washing, painting, minor repairs etc.
For road works A.R. estimate provides for patch repairing, repairs of
bridges and culverts etc

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Approximate or Rough Estimate
The estimation which is prepared using any one of rough method to get
the approximate cost of construction anticipated in a project.
Necessity of Approximate Estimate
To determine the approximate cost of the project
To minimize the time and manpower for preparing detailed estimate.
To decide project can be taken or not.
It useful to decide any alterations or small changes based on the
approximate estimate.

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Types of Approximate Estimate
Plinth Area Method
Cubical Content
Method
Service Unit or Unit
Cost Method
Typical Bay Method Carpet Area Method
Rough Quantity
Method

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Types of Approximate Estimate
Service Unit or Unit Cost Method
 The cost of the project is prepared by multiplying the cost of number of
unit in the structure.
Example:
1. Per student for school building
2. Per bed for hospital
3. Per kilometer for highway
4. Per seat for an cinema theater.

17. 4-Dec-20
Types of Approximate Estimate
Typical Bay Method
 The number of bay’s or panels are being taken as the basics of the
estimation.
Example:
1. Factory building with steel roof trusses
2. Lengthy halls with intermediate beams spaced at uniform
intervals.

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