Bathroom remodeling in Portland is a rot problem that happens to involve a tub. Bungalow baths are small, the window is often in the wet wall, and the fan frequently dies in the attic or the crawl. Rain on that window for months and steam that never leaves will soften the same studs. Carpenter ants are happy to confirm the diagnosis. Find the end of the duct and the condition of the wood before you pick a surround.
Ask what sits behind the new walls and whether the drain stays put. Moving a toilet over a crawl means joists you should look at while they are visible. A prefabricated base and a tiled shower fail in different places, and a flat floor fails both. If the wall behind the tub is already soft, replacement of that framing is the job, not a line item someone hopes to skip. Scale is not the headline here. Wet wood is.
The fan has to exhaust outdoors. A duct ending above the insulation becomes a roof stain in a city that does not need the help. Find the end while the ceiling is open. Recirculating air will not keep a corner clean through a wet winter. Grab bars need blocking if the tub is the obstacle. A curbless opening may mean cutting the floor. Say so before demo.
Do not open an outside wall into a week of rain and hope the west hills stay polite. Interior work still needs the house dry enough for adhesives and waterproofing to cure. Sort roof water and window water from bath water before you close a wet bay. Tile on a damp stud will not care that the fixture is new. Slope the floor to the drain.
Say the part of Portland, tub or shower, and whether a wet wall or a crawl is involved. Mention a fan that dies early and a window that has been weeping. You do not need a design board. You need the room and an honest word about the wood. Call the number on this page.