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Sounds great that you are getting into larger work. I would caution that any additional insurance you take on for a specific client be reflected in your fee structure. It is also possible to take on a specific project based insurance for that particular client/project. You need to speak with your carrier and see what's available. If you choose to carry it for the whole firm going forward as a cost of doing business, then consider that in the evaluation of your multiplier on your firmwide billable rates. If you are only a few people strong, then I would opt for the project policy or have the conversation with the writer of the RFP to determine if that additional insurance is negotiable somehow or if not, would they consider splitting the cost of the coverage.
I always opted for having the "insurance coverage cost" in some kind of proportion to the "fees paid". Why pay for a six-year exposure to multimillion-dollar lawsuits for a fee that doesn't reflect the risk? The bottom line is that it's your carrier's exposure to the risk and they need to be on board with that risk. Make a call, and best of luck as you grow!
Mark Forth, AIA, NCARB