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Set up a time with him on a day that works best for you each week, or how often you'd prefer to be updated. You should have an idea of or a clear timeframe for the progress of the home, but if you don't it'll be helpful to get an email from the Builder with a general timeframe and you can work from that when you have your scheduled calls about Job Completion. If they’re professional then they'll explain reasons for any setbacks, the resolutions and the new dates of completion.
Along with this, I would have them first send you a set of photos of the job currently at each angle and in each room and then going forward have him send you photos of the updates. Whether you use Dropbox or anything else to share photos, it's easier to text if both parties don't have an account yet, as there's no limit on the amount files you can text and you don't have to sign up for anything just to get photos. I also wish you luck on the new Home.
Greg
We had a very good luck with Mastic Leaf Relief product, that said we did run into some applications where it didn't work as well as expected.