Charging for estimates doesn't work where I live - debate all you want - if it works for your company great - if it doesn't - you know why. you can't convince an EC they should be charging for estimates unless you make it a law.
No matter where it is someone always say charging for estimates doesn't work where they live.
Some of what determines how successful you will be at charging a dispatch fee is where your leads are coming from.
Another thing that will determine this is how the call taker presents the dispatch fee over the phone.
It's not easy charging for estimates just like it's not easy getting jobs when you're not the cheapest contractor either.
Usually the more difficult something is the more rewarding it is as well.
You can always start out with a low dispatch fee of $5 to see how it goes. Many people will figure this is for your gas expense for comming out and won't mind paying it. $5 isn't much but it's better than nothing. If it's working for you increase it to $10. The cheapest of the cheap will not pay one penny for you to come out and give them an estimate, so if you want them for a customer you won't be able to charge anything to come out.
There's really no rule as to how much the dispatch fee needs to be or that you need to charge it everytime. You may have different dispatch fees based on how far away the job is and the size of the job you're giving an estimate on.
You're not charging it to cover all of the expense for going out and giving an estimate.
Again read this article:
http://contractingbusiness.com/ar/cb_imp_13003/