I view our particular field of business as an allocation of risks. IMO, we as businessfolk "roll the dice" each time we take on an engagement with an owner. The better informed we can be, the better prepared we are to reduce risks (and thus put or increase cash in our pockets at the end of the day)
It is often difficult in bidding public works projects to put in disclaimers/caveats in the bid as many jobs are unit priced with clear specifications. I actually prefer these somewhat over the open-ended "lump sum" jobs where it might be difficult to get an apples to apples comparison with the competition (we bid sidewalk as 5" thick, competition uses 4" ,etc...)
If we see a scenario at pre-bid stage which we think will jack up overall unit costs that the competition may have missed, we'll bring it up to ensure that we don't get lowballed on bid day. Let's face it, the owner, like us, doesn't like surprises, and to hear a contractor say "that wasn't included in my scope of work" makes the ears ring......At least the owner can prepare for such angst prior to bid opening. Many times we get the "bid the plans as you see them" response.....
If we see an opportunity to execute a particular phase of work in an intelligent , well-thought manner, which the competition may have neglected, we may not bring it up to the engineer (if we're sure it's an approved method) because often all questions posted pre-bid are public record for all contractors to see, thus "showing our hand". Rather, if we are fortunate to be the low bidder, we'll engage in "value engineering" with the owner.
We're not good gamblers, so we seek to try to make reasonable profits through mechanisms other than "banking" on change orders. A previous poster mentioned an outfit "making it up on paving" and followed up that the firm was now out of business.
is it ethical to count on making your profit on change orders?
ethical- i'm unsure..... risky- i'm certain......
ps- I've heard some stories recently through the grapevine that some firms are taking projects at "loss" so as to reduce the amount of cash that must be infused into the company (given a set rate of overhead)........hopefully that won't go on too long.....