Detailed estimates are made where more information is available or the scope of the project is better understood.

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Chapter 2:- Detailed timate
ER. MEGHA JAMBHALE (NOT )
meghajambhale253@gmail.com
Detailed Estimate
Prepared by finding out actual quantities of different items of work & then multiplying by
corresponding rates.
The detailed estimate is prepared in two stages.
● Details of measurements and calculation of quantities.
● Abstract of estimated cost.
Methods of Detailed Estimate
● Unit quantity method
○ Adopted to prepare the preliminary estimate.
○ Project is divided into various items.
○ Then the total quantity of each is calculated.
○ Total cost of each item is worked out by multiplying the cost per unit quantity
by the number of units.
● Total quantity method
○ In this method, the item of work is divided usually into the following
subgroups.
a. Material b. Labour c. Plant & Machinery
b. Overhead charges b. Profit
○ The total quantities of each subgroup are calculated & multiplied by the cost
per unit to get the total cost of each subgrade.
○ Total cost of work is obtained by adding the cost of all subgroups.
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● Data required for Detailed Estimates.
Sr.no. Data Necessity
1. Drawing This is the basic form under which we calculate
the amounts of the various articles for a work.
2. Specification
a) General Gives general ideas for the project.
b) Detailed Useful in the execution of the different
elements of the different elements of the work
to the site supervisor and the owner to perform
the work according to the detailed
specifications.
3. Rates Used for preparing estimates.
● Factored to be considered during preparation of a Detailed
Estimate.
Sr.no. Factor Description
1. Specification Provides a description of the equipment and
methodology.
Decide rates.
2. Quantity & availability Don't hammer work and labour can't sit on
their hands.
Depending on volume, material can be
purchased either in bulk quantity or small
quantity.
3. Location of site Appropriate approach of roads, electrification
determines the construction cost.
4. Labour Component. The skills and daily wages of the local
workforce must be taken into consideration
prior to the preparation of a detailed estimate.
5. Nature of work For the small nature of the work, the
availability of local material and manpower
should be taken into account for the large
nature, transportation costs and available
material should be taken into account.
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Steps in preparing Detailed Estimate
● Takeout Quantities
○ Divided the entire work into various elements of works.
○ The articles are classified and grouped into various subheadings.
○ Complete the detailed measurement for each work item and enter it into the
measurement sheet.
○ Squaring dimensions are done.
● Squirting
This is the calculation of numbers, length, area & volume & are entered in the last
two columns of the measurement sheet.
● Abstracting
○ The cost of each item of work is calculated at the workable rate.
○ The total cost is worked out and entered in the abstract of estimate form.
Contingencies = 3 to 5 %
○ Work charged establishment = 1 ½ to 2 %
○ Thus the grand total is the estimated cost of the project.
● Check list
○ Normally the execution of work is started with clearing of site, execution etc.
Therefore a checklist is prepared as per sequence of execution of items of
works. Following are the main items of work.
Sr.
No.
Item of work Unit Calculation
1 Earthwork Cubic Meter Length X Breadth X Depth
2 Soiling Cubic Meter Length X Breadth X
Thickness
3 Concrete in
foundation
Cubic Meter Length X Breadth X Depth
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4 Damp proof
course D.P.C.
Square Meter Length X Breadth with
thickness
5 Masonry Cubic Meter -
6 Lintel over
openings.
Cubic Meter L = S+2bw
S = Clear Span and
Opening
be = Width of Bearing
7 R.C.C. and R.B. Cubic Meter Length X Breadth X
Thickness
8 Steel work By weight Volume = %
reinforcement X Volume
RCC
9 Flooring
a. Ground
floor
b. Subsequent
top floors
Square Meter
Cubic Meter or
Square Meter
Inside dimension from
wall to wall
superstructure.
-
10 Roof Cubic Meter -
11 Plastering and
Pointing
Square Meter -
12 White washing Square Meter -
13 Color washing Square Meter -
14 Distemporing Square Meter -
15 Painting Square Meter -
16 Vanishing Square Meter -
17 Electrification - 8% of estimated cost.
18 Sanitary - 8% of estimated cost.
19 Water supply work - 8% of estimated cost.
● Abstract Sheet
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○ The cost of each item of work is calculated by multiplying the quantity
computed in measurement from which the rate per unit in a tabular form as
abstract form.
○ The cost of each item of work is added to get the estimated cost of work.
○ Specification for Abstract sheet
a. Description or Particular of item
b. Quantity
c. Unit
d. Rate Rs.P
e. Unit of Rate
f. Amount Rs.P
● Brief specification of a First-Class Brick work in building
○ Foundation & Plinth.
○ Filling.
○ Damp proof course.
○ Superstructure.
○ Roofing.
○ Flooring.
○ Finishing.
○ Doors & Windows.
○ Miscellaneous.
● Brief specification of a RCC M20 Slab
○ General.
○ Coarse Aggregate.
○ Fine Aggregate.
○ Water.
○ Proportion.
○ Mixing.
○ Laying and Compaction.
○ Formwork.
○ Curing.
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