I usually just guess, trying to keep it at a minimum of $50 per hour. Like Ameri-clean said......win some, lose some.
If it's something small, I'll do it, but I try to just stick to what I know.....I don't go out of my way to so things extra. I would try to refer them to someone else, maybe build a relationship with that person.
For instance, if you had a deck repair to do, and didnt know a saw from a shovel, I would hook up with deck builder and work something out with him. You can help each other.
My 2 cents...
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Mike Hughes
Everclear
Souderton, PA