Or, don't do this. Other professionals (accountants, lawyers) will happily meet with you for an hour or so and give advice without charging anything. Consider being like them.
It's not unfair to charge for a proposal (and the process that generates it), but it's unusual, and it creates a large risk that the client has to shoulder (if I don't like your proposal, then what? The proposal is most of what I have to go on for how good a fit you are in the first place!)
I wouldn't do business with a contractor that demanded payment for proposals. I say this as the operator of a business in which proposals are seriously expensive to generate. I wrote a large proposal last week after a series of phone meetings, and the proposal didn't generate any business. Oh well! That's life in the big leagues.
Worked for me, for big name clients like Ford, Pepsi, TBWA/Chiat Day, Bear Stearns, etc., as well as smaller ones. We really met for more than 2 hours, but after the initial contract was signed for the proposal. That includes lots of investigation time. My proposals included specific implementation details, milestones, and usually wireframes.
I was amused to find out that my architect/builder does the same -- I'm paying him $5,000 to dig holes, poke holes in things, survey, price materials, order samples, talk to craftsmen, deal with the planning board etc. and at the end if I decide I don't want to use those plans with him, I can use it to competitively price other architect/builders. But chances are very high I won't, because he's delivering exactly the level of detail and care I want to see.
It's not unfair to charge for a proposal (and the process that generates it), but it's unusual, and it creates a large risk that the client has to shoulder (if I don't like your proposal, then what? The proposal is most of what I have to go on for how good a fit you are in the first place!)
I wouldn't do business with a contractor that demanded payment for proposals. I say this as the operator of a business in which proposals are seriously expensive to generate. I wrote a large proposal last week after a series of phone meetings, and the proposal didn't generate any business. Oh well! That's life in the big leagues.