Why the cheapest industrial quotation often costs the most

This is not a plea for higher rates. A cheap quotation from a contractor who has understood the scope is simply a good quotation. The problem is the cheap quotation that has not understood it, and the two look identical on a comparison sheet.

How a low price recovers itself

Through variations. Anything not explicitly included becomes an extra, priced without competition, after mobilisation.

Through idle time claims. A price that assumes uninterrupted access, on a job where access was never going to be uninterrupted.

Through supervision. Fewer supervisors, more rework, and a plant engineer who ends up supervising the contractor.

Through your own people’s time. The cost that never appears on any invoice, and is usually the largest.

Through schedule. A shutdown that overruns by one shift costs more than the entire contract on most production lines.

Making the comparison real

Before comparing prices, normalise the scope. Ask every bidder the same set:

• Is lifting equipment included, and for how many days?
• Is the price for day shift, or does it cover nights and Sundays?
• What is excluded? Ask for the exclusions list explicitly; a bidder who cannot produce one has not read the drawings.
• What is assumed about access and about plant support?
• What happens commercially if the machine or material arrives late?
• Who does the site measurement?

Then re-price the gaps and compare again. The order frequently changes.

The uncomfortable part

A contractor who quotes low and then holds the price without variations is losing money, and a contractor losing money on your job manages it by reducing supervision. That is the mechanism by which cheap becomes expensive. It is rarely dishonesty. It is arithmetic.

What to do about it

Do not simply pick the middle bid. Close the scope, then take the lowest price for the closed scope. That is a different exercise, and it is the one worth doing.