Bathroom remodeling in Hawaii meets humidity, salt, and a fan that often does not leave the house. Trade winds used to dry these rooms. When the breeze is blocked and the shower runs in a closed single-wall or framed room, the moisture stays in the wood. Termites follow soft boards. There is no basement waiting below. Water shows on a wall, on a slab, or on the ceiling under an upper bath.
Older single-wall baths are tight, and the pipes may be easy to see or barely covered. Newer framed baths hide a leak until the paint bubbles. An ohana bath is often a later tie-in to a drain and a vent that were sized for one household. Say which bath this is. Salt seizes handles. Ask what is behind the new wall before tile is the topic.
The fan has to reach the outdoors. A unit that only stirs the room will not dry a house that used to breathe and now does not. If the only exhaust was a window over the tub, decide if that opening stays, because windward rain hits it and a leeward bath can still rot once the breeze is gone. Say what is behind the tile and which way the floor slopes.
Moving a drain in lava rock or coral soil is a bigger decision than a catalog implies. Say if the layout stays. Grab bars need solid wood, and the wood may already be what the termites are eating. Do not close a soft wall and call it finished. If the ohana shares the water heater, say that before the fixture list gets long. Waterproof the wet wall in plain words.
Say the town, tub or shower, and whether this bath is in the main house or an ohana. Mention a fan that goes nowhere, a window that will not close, or wood that gives under a finger. You do not need a drawing. You need the room and whether the house can still breathe. Call the number on this page.