The pro underbid the job. Still, he said he would take the loss. I asked him to look at receipts and we covered the extra materials. In the end the job was still lower than the other bids and accomplished on time. We replaced a failed TREX deck with concrete. The plastic decking had become soft, and flexed enough when walking on it that it became a trip hazard. There were two experienced and hard working crew. the younger relative was learning the paperwork, bidding and scheduling end of the job. The crew let him learn by experience and did not complain about his mistakes. The job was expertly done. Recent rains show that there are no low spots and everything is almost imperceptivity sloped to drain the surfaces into areas I had identified. All the work was done on time and all the demolition materials were stack out of the way and job site clean up was done daily. I am truly a satisfied customer.