Give
the meaning of the following:
Extra
item
Prime
cost
Extra
item:
While quoting a tender a list
of items to be carried out by the contractor is quoted. During execution of the
work however, an additional item of execution may arise or the quantity of work
for a particular item mentioned in contract may increase above the decided in
contract. In both cases, the ‘item’ is referred as extra item and additional
charges are required to be paid to the contractor for its execution.
Prime
cost:
While preparation of a detailed
estimate for any work certain quantities like water supply – sanitary – door –
electrical fittings cannot be exactly worked out as they are bound to
fluctuation in accordance with the wishes of the owner. Hence, to account for
such items a lump-sum amount expressed as some ‘percentage’ of the tendered
cost for work is included while inviting a tender and is known as ‘prime cost’.
State
the circumstances under which revised and supplementary estimates are prepared.
Revised
estimate
Revised
estimate is prepared under the following conditions:
When the original sanctioned
estimate is exceeded by 5% or more.
The expenditure on a work
exceeds or is likely to exceed by 10% on the original administrative sanction.
Fluctuations and deviations in
materials with respect to quantity and costs from the original proposal.
During execution of work if it
is noticed the original sanctioned estimate is over-excessive.
State
the units of measurements of the following
Surface excavation
Door frame
R.C.C. slab 12 cm thick
Iron work in trusses
ITEMS
|
UNITS
|
Surface excavation
|
Cubic-meters
|
Door frame
|
Cubic-meters
|
R.C.C. slab 12 cm thick
|
Square-metres
|
Iron work in trusses
|
Quintal or tonnes.
|
