The bathroom decisions in the order you'll meet them, from the floor under the old tile to the tile layout, with the questions to ask and what a useful answer includes.
By Clamp ResearchReviewed by Emmanuel ForgePublished Oct 17, 2026Updated Oct 17, 2026
Ask about what you cannot see. Most of a bathroom's lifespan is decided behind the tile: the floor under it, the drain, the waterproofing system, the backing for the glass and the fan's duct. Each question below names when it has to be settled, and the waterproofing question names the test you should see before tile goes on.
Tub, shower or both, and can the drains go where we want?
Configuration first: the tub decision and what the floor allows
Settle the configuration with the layout, not after it: keep a tub, convert to a walk-in shower, or add a freestanding tub, then check that the fixtures fit and the drains can actually go there. Moving drains depends on what is under the floor, which may not be knowable until it is open. If the house ends up with no tub, decide that on purpose for how you live.
Make the configuration the first bathroom decision: tub, shower or both, with what each moves. Check fixture fit and drain feasibility against what is under the floor, say what stays unknown until opening, and settle a freestanding tub's drain and filler before the floor closes.
Before framingBefore rough-inGoes on a customer decision
Ask
Be ready to answer
Tub, shower or both, and which tub?
Do the chosen fixtures actually fit the room?
Can the drains move where the plan wants them?
What's under the floor, and when will we know?
If freestanding, where do the drain and filler land?
When the bathroom door opens, which fixture is visible from outside, and is that the privacy we want?
A useful answer includes
The configuration in the design agreement
The drain feasibility finding
What stays unknown until opening
The answer that should make you ask again
The answer not to give
Example answer“We'll make the drain work.”
What it leaves unconfirmed: The clearances, slope, venting and framing in the way.
Ask for: The route for each fixture.
Give instead: A dimensioned layout and the drain route, with what each move costs.
How many sinks, and where does everything live?
The vanity: sinks, width, mirrors, storage and heights
Settle the vanity before rough-in: one sink or two, the width that fits the wall and the door swing, the top, and whether the mirrors are flat or recessed medicine cabinets. Ask what plumbing the chosen layout actually changes, where the lights land at face height, and which parts are due when: the rough-in is set early, the cabinet and top order later.
Get the vanity configuration signed before rough-in: sinks, width, top, mirrors or medicine cabinets, storage, and the light heights. Rough the plumbing the chosen layout actually requires, block and recess while the walls are open, and release the cabinet and top order on its own date from the same sheet.
Before rough-inBefore the cabinet orderGoes on a customer decision
Ask
Be ready to answer
One sink or two, and what plumbing does that actually change?
What width fits the wall and the door swing?
Flat mirrors or medicine cabinets, and do they recess into the wall?
What height do the vanity, mirrors and lights land at?
Where do towels and supplies go?
Where will each person's everyday items go, and can both people use the vanity comfortably?
A useful answer includes
The vanity configuration in writing
The top and mirror selections
The storage plan
The answer that should make you ask again
The answer not to give
Example answer“The vanity comes with the package.”
What it leaves unconfirmed: Sink count, top, mirrors, storage and what each changes behind the wall.
Ask for: The vanity spec: sinks, top, mirrors and storage.
Give instead: The vanity configuration in writing before rough-in and the cabinet order.
Which toilet: height, style, and is there power beside it?
The toilet: height, style and the bidet outlet
Choose the toilet on purpose: bowl height and shape, one-piece, two-piece or wall-hung, and the exact model with its dimensions and rough-in. A wall-hung unit puts a carrier in the wall, so it is a framing decision, not a late swap. If a bidet seat is in the picture now or later, settle its power while the walls are open, per the seat's requirements.
Put the toilet on the selection sheet like any other fixture: height, bowl shape, style, and whether a bidet seat means an outlet now. Ask about accessibility plainly; a chair-height bowl and blocking beside it cost little during the job. A wall-hung unit moves the carrier into the rough-in, so it cannot wait.
Before rough-inBefore orders are placedGoes on a customer decision
Ask
Be ready to answer
Standard or chair height, round or elongated, and which exact model?
One-piece, two-piece or wall-hung, and is a carrier needed?
Is a bidet seat in the picture, and what power does that seat need?
Does anyone need the taller seat or grab-bar room beside it?
Can someone approach, sit and stand up comfortably without hitting the door, vanity or glass?
A useful answer includes
The model with its dimensions and rough-in
The carrier in the framing for wall-hung
The bidet power settled while walls are open
The answer that should make you ask again
The answer not to give
Example answer“A toilet's a toilet.”
What it leaves unconfirmed: The height, the shape, and whether a bidet outlet goes in while the wall is open.
Ask for: The toilet on the selection sheet with the outlet question answered.
Give instead: The height and style selected, and the outlet decision made while the walls are open.
What is actually in the shower: heads, sprays, bench, steam?
Shower features: the valves and benches live in the wall
Pick what is in the shower before rough-in: the main head, a handheld, a rain head, body sprays, a bench. Ask what each adds behind the wall for the selected valve and products. A steam shower is its own system, not another head: generator, enclosure, ceiling and vapor control follow the selected manufacturer's requirements, so ask for that complete specification.
List the shower features with the valve work each one carries, price them before rough-in, and say plainly what cannot be added after tile. Steam is sold as a system: scope the named manufacturer's generator, enclosure, ceiling and vapor requirements before anyone commits.
Before rough-inGoes on a customer decision
Ask
Be ready to answer
Which heads and sprays, and where does each mount?
What does each feature add behind the wall?
Are we doing steam, and whose complete system is it?
What does the steam system require for the ceiling and enclosure?
Can we adjust the shower without standing under the spray, and can everyone reach the controls?
If we're adding steam, what complete wall-and-ceiling system is approved for it, including the backing and vapor control?
A useful answer includes
The feature list with its valve work
The steam system's complete specification where chosen
What cannot be added after tile
The answer that should make you ask again
The answer not to give
Example answer“We can add a rain head no problem.”
What it leaves unconfirmed: The valve, supply and drain work behind it.
Ask for: What each feature adds behind the wall, priced.
Give instead: The feature list with its valve and drain work, priced before rough-in.
Where do the niche and bench go, and can the entry be curbless?
Shower geometry: lock it before framing
Ask where the niche and bench go and whether a curbless entry is possible with this floor and the selected shower system. Niches, benches and curbless entries change the framing and the waterproofing, so they have to be decided before framing and the shower base, not at the tile stage.
Settle the niche, bench and entry before framing and the shower base. Check the floor structure for a curbless entry, and keep niches off exterior walls unless the insulation is detailed for it. Follow the selected system's instructions.
Before framingGoes on a customer decision
Ask
Be ready to answer
Where do we want the niche and bench?
Is a curbless entry possible on this floor?
Does the niche go on an exterior wall?
What does the shower system require for these features?
Does anyone need a transfer seat, seated reach or wider maneuvering room?
Can we reach the niche while showering, and can someone use the bench without blocking the entry?
A useful answer includes
A dimensioned shower detail
The system's installation instructions
The answer that should make you ask again
The answer not to give
Example answer“We can add the niche once we start tiling.”
What it leaves unconfirmed: The framing, waterproofing and tile coordination.
Ask for: The shower detail with the niche and bench placed.
Give instead: A dimensioned detail settled before framing.
A surround or tiled walls, and how does it meet the tub?
The wet walls: surround or tile, and the tub interface
Choose the wet-wall system before rough-in parts are ordered: a one-piece or multi-piece surround, or tiled walls, as the room's access and the selected products allow. One-piece units may not fit through an existing bathroom's doors. The choice sets the valve depths, what goes behind the walls and the niche, and it sets how the tub or pan meets the wall and how the edges are finished.
Price the surround and the tile option honestly: the system behind each, the valve depths each needs, the schedule difference, and what the client sees at the edges. Get the choice signed before the rough-in parts are ordered.
Before rough-inBefore orders are placedGoes on a customer decision
Ask
Be ready to answer
Surround or tile, and does a one-piece even fit into this room?
What goes behind each option, and which valves and depths does each need?
How does the tub or pan meet the wall, and how are the edges finished?
What does each cost here, and how do the schedules compare?
A useful answer includes
Feasible options priced, access checked
The system behind each
The tub-to-wall and edge details
The answer that should make you ask again
The answer not to give
Example answer“Tile always looks better.”
What it leaves unconfirmed: The cost, the waterproofing behind it, and the schedule for each.
Ask for: Both options priced with what goes behind them.
Give instead: Both options priced here, with the system behind each and the schedule difference.
Are we heating the floor, and what does that change?
Floor heat: decide before rough-in, test before tile
Decide on floor heat before the floor goes down and before electrical rough-in: ask what circuit and thermostat the selected system needs, what height it adds, and which areas it covers, on the plan. It cannot be added under tile later without redoing the floor, and the selected product's instructions say when the cable is tested and recorded during the install.
Settle floor heat before rough-in: the circuit and thermostat, the mat layout, the height change at the door, and the resistance tests before and after tile. Put the coverage area on the plan, not in conversation.
Before rough-inGoes on a customer decision
Ask
Be ready to answer
Are we heating the floor, and which areas, on the plan?
What circuit and thermostat does the selected system need?
How much height does it add, and where does that show?
When does the product say the cable gets tested and recorded?
A useful answer includes
The coverage area on the plan
The circuit, thermostat and sensor locations
The product's test records at its named stages
The answer that should make you ask again
The answer not to give
Example answer“We can add floor heat if you want.”
What it leaves unconfirmed: The circuit, the height change, the coverage and the price.
Ask for: The circuit, coverage area and test plan.
Give instead: The circuit and thermostat, the coverage, the height change and the tests, priced.
What do we know about the floor and any past leaks?
Subfloor and hidden damage: say what you'll check
Ask what is known about past leaks, the floor framing and the subfloor, and what repairs could be needed once the old floor is up. Rot around a toilet or tub is common in older bathrooms and often can't be seen until demo. What matters is that the check is planned and the repair is priced before it is covered.
Say what you can see now, what you'll check after demo, and how a repair is priced. Backer board does not fix a weak floor; the tile assembly needs a sound, stiff substrate. Plan the check and the price before anything is covered.
Before demoBefore tileGoes on the design agreement
Ask
Be ready to answer
Have there been leaks here?
What will you check once the old floor is up?
What repairs could be needed, and how will they be priced?
Is the floor stiff enough for the tile we picked?
A useful answer includes
Existing-condition photos
The findings after demo
The repair specification and price
The answer that should make you ask again
The answer not to give
Example answer“The new backer board will stiffen it up.”
What it leaves unconfirmed: Whether the framing and subfloor suit the tile assembly.
Ask for: The check after demo and how repairs are priced.
Give instead: What you'll check after demo, and how a repair is priced before covering.
Which valves and fixtures, and are the rough-in parts on hand?
Valves and fixtures: lock the rough-in parts
Ask which valve bodies, trims, tub and fixtures are selected, whether the rough-in parts match the trim you want, and when they arrive. The valve goes in the wall before the trim is chosen in many projects, so the family has to be settled early or the trim choice is limited later.
Lock the valve family and rough-in parts before plumbing starts, confirm compatibility with the trim the customer wants, and give the delivery dates. A universal valve is only universal within one brand.
Before rough-inBefore walls closeGoes on a customer decision
Ask
Be ready to answer
Which valve and trim family are we using?
Do the rough-in parts match the trim we want?
When do they arrive?
What substitutions are acceptable?
Do the faucet, shower trim, glass hardware and accessories look intentional together?
A useful answer includes
Model numbers
Manufacturer compatibility
Shipping dates
The answer that should make you ask again
The answer not to give
Example answer“Pick the trim later. The valve is universal.”
What it leaves unconfirmed: Compatibility, depth and availability.
Ask for: The valve family and its trim options.
Give instead: The valve family, the compatible trims and the delivery dates.
Where does the fan exhaust, and will it actually move the air?
Bath fan: show the duct and the termination
Ask which fan and controls are planned, where it exhausts, and whether the duct route will deliver the airflow the fan is rated for. Bathroom exhaust should go outdoors, not into the attic. Reusing an old duct may not work; ask whether it can be inspected before the ceiling is closed.
Show the fan, the duct route to an outdoor termination and the controls. If the existing duct can't be inspected before demo, say so and price the check. Verify airflow where the code requires it.
Before orders are placedBefore walls closeGoes on the design agreement
Ask
Be ready to answer
Which fan and controls are planned?
Where does it exhaust to outside?
Will the duct route deliver the rated airflow?
Can the old duct be reused?
A useful answer includes
The fan's installation sheet
The duct route and termination
Airflow verification where required
The answer that should make you ask again
The answer not to give
Example answer“We'll reuse the old fan duct.”
What it leaves unconfirmed: The duct's condition, route and termination.
Ask for: The duct route to the outside.
Give instead: The fan, the route to an outdoor termination and how airflow is checked.
Where will the glass, grab bars and accessories attach?
Backing: plan every attachment before walls close
Ask where the shower glass, grab bars, towel bars and accessories will attach and what backing each product needs. Backing has to go in before the walls are closed and waterproofed. Adding it later can mean removing tile, so plan for future grab bars even if you are not installing them now.
Plan the backing for every selected attachment and for future grab bars before the walls close, and photograph it with a tape measure in view. Coordinate with the glass installer before waterproofing.
Before walls closeGoes on a customer decision
Ask
Be ready to answer
Where will the glass and accessories attach?
What backing does each product need?
Can we add backing for future grab bars now?
Will you photograph the backing before the walls close?
Do heated towel bars or a lighted mirror need power run now?
A useful answer includes
A backing plan
The product mounting requirements
Labeled photos
The answer that should make you ask again
The answer not to give
Example answer“The glass installer will anchor it later.”
What it leaves unconfirmed: The mounting positions and the support behind them.
Ask for: The backing plan and photos.
Give instead: A backing plan for every attachment, photographed before the walls close.
Which waterproofing system is it, and when is it tested?
Waterproofing: name the system and schedule the test
Ask which complete waterproofing system is being used, including the drain, seams, corners and penetrations, and what test or inspection happens before tile. Tile and grout are not the waterproofing. Test methods and timing depend on the system and the local rules, so ask what applies to yours.
Name the system and its components, show the drain and transition details, and put the water test on the schedule before tile. Photograph the assembly. Competent waterproofing and the required test are part of every option, never an upgrade.
Before tileGoes on the proposal
Ask
Be ready to answer
Which waterproofing system are you using?
How are the drain, corners and penetrations handled?
What test happens before tile, and can we see it?
Will you photograph the assembly before it's covered?
A useful answer includes
The named system and components
Assembly details
The test record and photos
The answer that should make you ask again
The answer not to give
Example answer“We use waterproof board, so it's covered.”
What it leaves unconfirmed: The full system, the transitions and the test.
Ask for: The system name and the test date.
Give instead: The system, the details and the test on the schedule before tile.
What kind of shower glass, and when is it measured?
Shower glass: decide early, measure after tile
Decide the shower glass early and order it late: framed, semi-frameless or frameless, a hinged or sliding door, and the hardware finish. Glass is measured after tile and fabricated to the real opening. Check that the door can open with room to enter and reach the controls. The glass is not the waterproofing; the system behind the tile is.
Get the glass decision signed with the tile layout: type, door, hardware finish. Book the field measure for after tile, tell the client the gap between tile and glass up front, and name who adjusts the door after the first weeks of use.
Before orders are placedGoes on a customer decision
Ask
Be ready to answer
Framed, semi-frameless or frameless?
Hinged or sliding, and where does the door swing?
When is the glass measured, and how long after that is it in?
What does the fabricator need ready before the measure?
When the glass door opens, is there room to enter, reach the controls and move without hitting anything?
A useful answer includes
The glass spec with the hardware finish
The measure-after-tile date and lead time
The swing on the plan
The answer that should make you ask again
The answer not to give
Example answer“Glass goes in at the end.”
What it leaves unconfirmed: How long after tile, and what the bathroom is like until then.
Ask for: The lead time from field measure to install.
Give instead: The glass spec signed with tile, the measure date, and the gap until install.
Which bathroom floor material suits this room, and what does it need underneath?
The bathroom floor: material, subfloor and where water stops
Choose the bathroom floor family and its thickness while the room's layout is being set: tile, sheet vinyl, resilient planks or another product proposed here. Floor height affects the toilet flange, the doorway and any curbless shower. Ask which suits the splashes, cleaning and barefoot use, what each needs underneath, and whether any floor waterproofing outside the shower is specified.
Set the floor family and build-up height with the layout, before rough-in, so the flange, door and shower details work. Name each option's subfloor prep, say whether floor waterproofing outside the shower is specified or not, and detail the edges. The final product can follow if the dimensions hold.
Before rough-inBefore orders are placedGoes on a customer decision
Ask
Be ready to answer
Which flooring options suit our expected splashes, cleaning and barefoot use?
What subfloor checks, leveling or stiffening does each option need?
Is waterproofing planned outside the shower, and where will it end?
How will the finished floor meet the tub, toilet, doorway and adjoining floor?
A useful answer includes
A product suited to the exposure and cleaning
Subfloor prep and water-management decisions
Finished heights, edges and transitions
The answer that should make you ask again
The answer not to give
Example answer“Tile is the only real bathroom floor.”
What it leaves unconfirmed: Whether another covering suits this room and what each needs underneath.
Ask for: The options compared for this bathroom.
Give instead: The families compared for this room, with the prep and edge details.
Where does the tile stop, and can we approve the layout first?
Tile layout: approve it before setting
Ask where the tile starts and stops, what the pattern, joints, trim and visible cuts will be, and where the required water protection extends, which may be beyond the decorative tile. A drawn or laid-out sample before setting avoids the cuts you would otherwise see every day.
Mark the tile extent on elevations, show the pattern, joints, edge trim and where the cuts fall, and show where the waterproofing extends separately. Lay out a sample before setting. Plan the movement joints.
Before orders are placedBefore tileGoes on a customer decision
Ask
Be ready to answer
Can we approve the tile layout before setting starts?
Where does the tile start so the cuts at corners, niches and edges look intentional?
Should the grout and caulk blend or stand out, and can we see them with the tile?
Have we seen the floor tile, wall tile, vanity top and paint together in this room's light?
Where does the tile stop on each wall, and what edge trim finishes it?
A useful answer includes
Marked elevations
A sample or dry layout
The selected materials
The answer that should make you ask again
The answer not to give
Example answer“We usually center the tile on the main wall.”
What it leaves unconfirmed: The layout and the decorative limits.
Ask for: The marked elevations and a dry layout.
Give instead: Elevations with the extent and cuts, and a layout to approve.
Which paint and other wall finishes belong on the bathroom walls and ceiling?
Bathroom walls and ceiling: finishes for the humidity they get
Choose the paint and other finishes for bathroom walls and ceilings outside the shower or tub enclosure. Compare washable paint, wallpaper, wainscot, paneling and any specialty finish for the humidity, splashes and cleaning expected in each location. Write down the colors, coatings, sheens, exact boundaries and surface preparation. Treat a steam enclosure as a separate system, not as a painted bathroom wall.
Write the bathroom finish schedule: products, primers, colors and sheens matched to each surface's humidity and splash exposure, with the boundaries and prep. Keep steam enclosure surfaces out of it; they belong to the steam system.
Before orders are placedGoes on a customer decision
Ask
Be ready to answer
Which walls and ceilings will be painted, and which get another finish?
What paint, primer and sheen suit each surface and its humidity or splashes?
Where will wallpaper, wainscot, paneling or specialty finishes start and stop?
What preparation is needed under each finish?
If there's a steam enclosure, which surfaces belong to its own system?
A useful answer includes
A paint and wall-finish schedule
Exact boundaries and prep
Finishes matched to exposure, steam handled separately
The answer that should make you ask again
The answer not to give
Example answer“We use bathroom paint in bathrooms.”
What it leaves unconfirmed: Which product and sheen, on which surfaces, and where each stops.
Ask for: The finish schedule for this bathroom.
Give instead: Products, colors and sheens per surface, with boundaries and prep.
Which trim and cabinet products suit the water exposure at each location?
Wet exposure: pick materials by where the water goes
List the trim, vanity parts and cabinet bases that can get splashed or sit next to a wet floor, especially at tubs, showers and sinks. Compare the actual products for each spot by their intended use and stated moisture limits, whatever the material. Distinguish ordinary humidity, occasional splashes and repeated wetting, and ask what can be reached or replaced if water gets behind.
Name the actual product for each wet location and its manufacturer's moisture limits, the expected exposure there, and how cut edges, attachment and joints are handled. Edge treatment helps but doesn't make an unsuitable product suitable for repeated wetting. Fix water sources separately, and note what is replaceable.
Before orders are placedGoes on a customer decision
Ask
Be ready to answer
Which baseboards, casing, vanity parts and toe kicks could get splashed or sit against a wet floor?
For each spot, is it ordinary humidity, occasional splashes or repeated wetting?
Which actual products suit each spot, and what do their makers say about moisture?
How are cut edges and joints handled, and what can be replaced if water gets behind?
A useful answer includes
The exposure level per location
Named products with their moisture limits
Edge, joint and replacement details
The answer that should make you ask again
The answer not to give
Example answer“We use the same trim throughout the house.”
What it leaves unconfirmed: Whether that trim holds up at the tub and the wet floor.
Ask for: The material for each wet location.
Give instead: Materials chosen per location, with edges sealed and replaceable parts named.
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