The team of granny flat builders knows exactly what they have to do regarding their work which is why you need to let them do their job. Just be sure to let them know what type of house you want, and how you want it to look so that you get the design you have imagined. With good communication, you can get to have the house of your dreams. There are also documents you need to have when you want to build a house, you need permits and such things therefore be sure you have everything the law asks.
https://open.substack.com/pub/frankspencer3/p/essential-questions-you-should-ask?r=4cqcbl&utm_campaign=post&utm_medium=web&showWelcomeOnShare=true