Data needed to
start for an estimate
For starting a brief estimate, an
estimator should possess the data given below :
· Plans, sections
and other details associated with the work.
· Specifications
focusing on the proper nature and a class of materials for
application.
· Lastly the
proposed rates for executing various items of work. In order to find
out the quantities precisely, an estimator should
maintain clear, completely dimensioned, authentic and accurately scalable
drawing. While digging out quantities, the estimator should abide by
some good principle.
How to make an
estimate
There exist three crucial steps for
making out an estimate:-
1 . Detecting quantities
While detecting quantities, the
measurements should be acquired from the drawings and put on the
measurement sheet or dimension paper. The measurements should be based on
the unit of measurement. The unit of measurement will range from cubic meter
in 1st case and square meter in the second case.
2. Squaring out
The second phase includes preparing
volumes, areas, etc. as well as casting up their total in
standard units.
3. Abstracting
In the third stage, all the items with
the net results acquired in the second stage are forwarded to
specially ruled sheets containing rate column set for pricing from measurement
sheets . A third person must verify all the calculations and each transferred
entry made in the second and third stages to get rid of any mathematical or
copying omissions.
Standard Method
of Measurement of Building Works
An Estimator finds it difficult to
cope up with the various systems of measurement offered by
various Central and State Government departments as well as construction agencies.
It also results in standing cause of controversies. So, there should
be a harmonization among diversified methods at the technical level.
Principles of Deciding
Unit of Measurement
The units of measurement of different
items are very complicated. In order to select the ideal units
of measurement, the undermentioned principles should be followed.
1. The unit of
measurement should be uncomplicated and simplified to measure, record
and understand.
2. The unit of measurement should designate for
fair payment of concerned work.
3. In the result it should provide quantities,
which should not be too little or too outsized.
4. The price per unit should not contain a very
minute figure or a very large one. Usually items with higher cost will be
calculated in smaller units and lower cost in bigger units.
5. The unit of measurement may at times rely upon
the unit for the raw material and/or labor and/or significant dimensions.
