I sub out my stump grinding work. Its more accurate to say I give away my stump grinding work, which adds up to thousands a year for the stump guy.
There is an up-front set of conditions, in leiu of my getting a commission.
-Promptness : When they call you, make them a priority. I'll ask them to reference my name so you know where the work came from.
-Communication: Call the client right back if they've called and left a message. Many clients expect a price quote BEFORE you grind. I know you'd prefer to go there and do the job in one shot, and I hope you can. Coordinate with them.
-Cleanup : I warn them in advance that they'll be left with a mound of chips / dirt. Do not leave them with chips spread all over the yard, sidewalk and street. Use tarps, or whatever. If you don't have a good, powerful blower, get one. Your quality of work reflects on me.
-Pricing: I don't price your work for you. Be reasonable. I did a $350 takedown once on a silver maple. Stump guy ground the stump without first doing a quote, then asked $400, and wouldn't budge. This disrespectful act cost him big. He will never, ever grind another stump on my referral.
Reliability: If this needs explaining, you're probably not the guy I want to refer.
Some Tree Care Professionals may want a kickback. Personally, for me, something like 10% on a $100 stump isn't worth the time to chase you down. We make our money moving on to the next job, leaving happy, satisfied customers in our wake.
If you are to pitch your service to a treeguy, these may be some good guidelines to offer.