Derek can do good work. Make sure you discuss what YOU want and not just accept what HE thinks is the best way to go. If you are tying into existing work he needs to make it match. He can be somewhat lippy and borderline rude. I always expect contractors to knock on the door and not to show up and start work un-announced, and I expect to be introduced to all workers on site. I found it unacceptable that he laid eavestroughing material across my neighbours lawn and blocked his driveway.