RELIABILITY OF THE ENGINEERS ESTIMATE IN SELECTIVE TENDERING FOR BUILDING WORKS
RELIABILITY OF THE ENGINEERS ESTIMATE IN SELECTIVE TENDERING FOR BUILDING WORKS
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Date
1982-09
Authors
Shehu, Lawal Giwa
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Abstract
This research work deals with the investigation of the reliability or
otherwise of the engineer's estimate in selective tendering for building
works. The term 'engineer's estimate' as used in this work means the
estimated cost of a building normally prepared for the client by his
construction cost consultants just before or during tender period,based
on the same tender documents given to selected tenderers. In this work,
the bills of quantities forms part of the tender documentation. This estimate
is also referred to as comparative or pre-tender or QS estimate.
The investigation is limited to pre-contract stages of the building
process. As a result of this, the investigation dealt mainly with the
question of how reliable the engineers estimate is to the client, in terms
of getting responsible tenders and awarding the contract within not more
than +10 percent difference from the engineers estimated cost.
It has been discovered during the investigation that clients rely
heavily on the engineers estimate to the extent that for a contractor to win
a contract for building works, his tender should not differ by more than
+10 percent of the engineers or QS estimate. In addition to this, it has
also been discovered that strict reliance on the engineers estimate,
especially in cases where the trend of tenders reveal otherwise, might result
in unpleasant post contract problems such as escalation of costs and possible
delay or abandonment of the project. This is because the engineers
estimate is not 100 percent reliable. As such, in cases where majority
of tenders received differ very significantly from the engineers estimate,
then the accuracy or otherwise of the engineers estimate should be looked
into. Recommendations on how to improve the reliability of the engineers
estimate are proposed in the conclusions.
In general, this work has helped to bring out some problems in tendering
as well as preparation of tender documents and pricing. It is hoped that the
result of this research will be of immense benefit to the Government,
various members of the Construction Industry and the general public.
Description
A thesis submitted to the Postgraduate School, Ahmadu Bello
University, in partial fulfillment of the requirements for the degree
of Master of Science in Construction Management in the Department of
Building, Faculty of Environmental Design Ahmadu Bello University
Zaria, Nigeria
September, 1982
Keywords
RELIABILITY,, ENGINEERS,, SELECTIVE TENDERING,, ESTIMATE,, BUILDING WORKS