I guess I'd take the contrarian view here.
We've had this issue arise with our firm - part of which designs buildings as the EOR and another part of our firm does precast concrete design and detailing work for precast companies.
I believe that there IS at least an appearance of a conflict of interest with multiple clients on the same project. And even the appearance of a conflict is often frowned upon in many engineering ethics standards.
If you communicate to all parties (owner and contractor) that you are providing services to both on the same project, then you perhaps have at least avoided a sense of conflict by getting everyone to agree that you can provide these services professionally.
However you now have two clients that you owe full professional duty to on the same project and for the same work and as a result you have the appearance of a conflict of interest.
If issues arise during construction between the owner and the contractor, you would be in the middle of it all with a very real conflict of interest.
You might not personally see a conflict yourself, as you would most likely just provide facts and unbiased opinions, but that doesn't change the fact that you have the appearance of a conflict.
Here's a couple of segments of the NSPE Code of Ethics (USA)
[blue]4. Engineers shall act for each employer or client as faithful agents or trustees.
1. Engineers shall disclose all known or potential conflicts of interest that could influence or appear to influence their judgment or the quality of their services.
2. Engineers shall not accept compensation, financial or otherwise, from more than one party for services on the same project, or for services pertaining to the same project, unless the circumstances are fully disclosed and agreed to by all interested parties.
5. Engineers shall not be influenced in their professional duties by conflicting interests.
1. Engineers shall not accept financial or other considerations, including free engineering designs, from material or equipment suppliers for specifying their product.
2. Engineers shall not accept commissions or allowances, directly or indirectly, from contractors or other parties dealing with clients or employers of the engineer in connection with work for which the engineer is responsible.[/blue]
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