Kevin will charged you $10,000 over his estimate while leaving your yard in shambles and leaving you to clean up his workers garbage. He will charge you for a full crew and extra work hours, all while chicken-hawking your neighbours for work and spending his crew out taking focus away from the job you hired him for.
Make sure all communications with Kevin are in written form.
*Added since Reply*
Kevin knew the extent of the job prior to making his original estimate. What became unexpected was where the water table was under my house. Kevin was made aware of the water and that pumps wouls be required. Kevin then sent his crew with no pumps and claimed it as a wasted day for his crew.
I don't have an issue with the work done by the crew he sent. It was a rough situation, but he knew this prior to taking on the job.
As for the rubble and garbage, I requested that the bricks and tree roots be backfield with the dirt. Kevin took this as all the materials used by his crew and garbage they created gets left at the customer's property. Like I said earlier, make sure all communications with Kevin are done in writing.
The garbage left behind was discovered on the same day he billed $10,000 over his estimate. He gave no warnings that the bill was climbing that high. Minus the water situation, Kevin knew what the job entailed.