Bathroom remodeling in Houston is a moisture project before it is a style project. The air is wet enough to mold grout, rust a metal frame, and swell a cabinet if the fan is weak or dumps into the attic. Slab floors lock the drain where the builder put it. A pretty tile job on a damp backer will bloom at the curb before the year is out. Start with water, then with the picture you had in mind.
The fan and the waterproofing are the remodel. Exhaust has to leave the house through a duct that actually reaches the exterior, not a humid attic that already struggles. Ask how the shower pan is waterproofed, where the membrane turns up at the curb and the niche, and whether the valve can be serviced later. A gulf storm is not required for this failure. A week of ordinary humidity and a lazy fan will do it.
Layout on a slab is a concrete conversation. Moving the shower or the toilet means opening the slab, and anyone who waves that off has not worked this city. If the bath was added on, look at the tie-in and the low step that floods first when water enters the house. Do not close new finishes over a known roof leak or a wall that is already soft. Fix the path of the water, then close the room.
Use the work to correct what the climate repeats. Set a fan that can actually move the air, and give it a damper so wet wind does not blow back down the duct. Replace valves that have corroded in the damp. If the floor is cracking because the slab moved, a new skin will crack too. Ask what under the finish is being corrected. The risk here is mold, a stuck drain, and water that arrives from a storm at floor level.
Describe the room, say that the floor is slab unless it is not, and name the problem: moldy grout, a leaking pan, a fan that goes nowhere, or a layout you want moved. Mention a soft wall or a roof stain over the bath. Ask who handles the membrane, the fan duct, and the valve. Call the number on this page.