Secondly, once they arrange an appointment to meet with you and they actually show up on time, they should receive another √!
Thirdly, quiz them on what they know! A competent tradesman or builder should know their technical stuff in detail and be able to explain it to you. √! Given the reputation of some builders and tradesmen, you will need to interview them to the best of your ability so that you have confidence that they know what they doing. Unfortunately, many don’t, but make out they do. You will need to bring them undone!
And lastly, you need to like this person or this company. Good and effective communications are a rare commodity these days between a builder and an owner. If you like the person and feel comfortable talking to them, chances are you will get a much better result and have a more enjoyable experience. √! The flipside is dealing with a tradesmen or builder who is unapproachable and damn right rude. And we’ve all had one of them before!!!