Just give them a swag estimate. $1000/fixture for the plumbing. How much are you going to do yourself.
To pull a permit on my project, one of the inspectors in my town tried to get me to use a figure of what it would cost if I had a pro do the work (It probably would have been $25k start to finish), then his boss came over and said $2000. Done.
To pull a permit on my project, one of the inspectors in my town tried to get me to use a figure of what it would cost if I had a pro do the work (It probably would have been $25k start to finish), then his boss came over and said $2000. Done.