Thoughts?

Talk with your builder when you have questions. Keep talking until you both understand.

^^

I will go a step further than PPF

Do this:

https://www.farrow-ball.com/us/paint/applications?gad_source=1&gad_campaignid=20403806068&gclid=Cj0KCQjwkOvTBhDgARIsAKUNyRtjnxKbyUUhMLONOPM7M8LJvBMa2XdQEfK42ZGJxewJ2mJKuhS-438aAjBAEALw_wcB

and you will get this........

Do not count on a builder alone, very used to Sherwin and Ben Moore.............

Also consider the style/flavor/decor and the LOOK you are after.

I have never used F&B, but over the years I have settled on the sheens I like: for the walls, a washable matte; for the trim, satin, and for the ceiling flat.