A remodeler will measure the alcove, check the valve and drain, and ask whether you want glass, a curtain, or a fixed panel. In a 1990s or 2010s Kingston house, the tub often comes out in one piece and the drain can stay close to its old location; older homes may need the floor opened to reset or replace the drain.
Most conversions need a plumbing permit, since the valve and drain are reworked, and the plumber can file it online through SmartGov. If walls or framing change, the remodeler files a building permit with Building, Inspections & Zoning at the Town House. Town inspectors check the rough plumbing before the walls are closed.
Once the base is waterproofed and tested, tile or panels go up, then the glass is measured and installed. Glass is often custom, so it can be the last thing on the schedule.