on occasion if I can tell right off the bat that the customer will try getting out of payment, I will add pictures of the tree to the quote, and detail the species, size, defects, location, etc, and yes, VERY important to add a liability line into the description about undisclosed underground utilities, and also never a bad idea to mention we aren't liable for cracked driveways, pavers or sidewalks (depending on location and how we have to access the tree)Take this as a word of advice.
Put everything in writing. Detail your proposals with the trees to be removed, their location. Specify underground hazards (that you are not liable for them if they are not disclosed and damaged).
Detail the tree to be removed, the height in which the stumps will be cut, and whether or not brush will be removed or remain on site. The more detail you put in the better.
Do not agree to proposed work over text. Text is not a contract.
Have the client sign the proposal.
Cover your ass in every way you can. There are clients that will make you pay if you don't.
I'm speaking from experience.
I bid a job a couple years ago for a crane removal, get told "nothing buried you can put the crane anywhere out front", well a week later we show up, start throwing outriggers down and the customer runs out "YOUR OUTRIGGER IS ON MY SEPTIC TANK"... that was fun, unused tank and we didn't fall in but we got lucky that the customer said something before we started shooting boom out directly over the unannounced septic tank (there was no above ground lid either)
had another one, storm job last year, I bid 2 trees, one sitting on his house but non emergency, other one standing out back no problems just want it gone, call the crane, about a week before we start the customer calls asking me to change the bill to double the price of removing the one on the house so insurance will "pay for the one out back" yuuuuup canceling that crane right now have a good day don't call us back, insurance fraud is sorta illegal
customers suck sometimes, 99.99% of mine have been excellent but lately I've had a couple try to make me do illegal stuff, I just usually quit replying to them
I do every bid with 2 people, so I have a witness to my verbal agreement jobs too, which in Tennessee IS a contract in itself, so is a handshake, but on high overhead jobs I do write things out very specifically and email a copy to the customer, if needed I will print one and deliver it to them a few days after the original verbal quote