A remodeler will measure, look at the floor and walls, and ask what bothers you about the room. Expect suggestions on fixture sizes, door type, ventilation, and storage, and an honest answer about whether moving any fixture is worth the plumbing work it takes.
The contractor files the building permit with Hull's Building Department and lists their HIC registration and Construction Supervisor license; a homeowner filing their own permit is the exception. The plumber and electrician file online, and rough work is inspected before walls and floors are closed. Because the trade inspectors are part-time, the schedule may include a short wait between stages.
In a small room, crews often work one after another rather than side by side. Ask for a written schedule that shows demolition, rough plumbing and wiring, inspections, tile, and fixtures, so you know when the room will be usable again.