A good first visit focuses on the person, not the fixtures. Expect questions about mobility today and in a few years, who helps with bathing, and whether a wheelchair or walker is in the picture. The remodeler should then explain what the room's size and framing allow.
Widening a doorway, moving a wall, or building a curbless shower usually involves a building permit, and new valves, drains, or wiring for lighting and fans need plumbing and electrical permits. All of these go through Braintree's Building Division, and inspectors check the work before walls are closed.
Ask for wood blocking behind every wall around the toilet, shower, and tub, even where no bar goes now. Installing it while the framing is exposed is a small step, and it lets you add grab bars later without opening them again.