Checklists · Bathroom
Wet Room Discussion Preparation Checklist
Helps you describe your room accurately enough for qualified professionals to answer the drainage, build-up and waterproofing questions, rather than settling any of them yourself from a picture you liked.
7 sections · 42 planning prompts · educational owner-side preparation
https://www.builddesignhub.com/checklists/bathroom-planning/wet-room-discussion-preparation · Build Design Hub — educational planning resource. Requirements vary by project and location.
Scope
What this checklist covers
The preparation ground these prompts walk through.
- Establishing what each person in the household actually pictures when they say wet room
- The drainage and floor level questions to raise before an open floor is assumed
- Where water travels once a tray and a screen are no longer containing it
- Drying the room between uses and what the household would have to do daily
- Storage, cabinets and everything in the room that has to stay dry
- Photographs, sequencing and responsibility to agree before covering work begins
Audience
Who this checklist is for
- Owners attracted to a level shower floor who have not yet discussed what it involves
- Households replacing a tray and screen in a room that is used every day
- Anyone preparing for a first conversation about an open showering area
- Owners of upper-floor rooms who want to know what to ask about the floor below
Timing
When to use it
- Turning a vague preference for a wet room into specific questions
- Recording how water behaves in the current room before anything is stripped out
- Preparing for a discussion about drainage position and floor levels
- Deciding what storage and fittings would have to change in an open room
- Agreeing what records you want before any surface is covered up
Limits
When it is not sufficient
This is general planning preparation. These situations need a qualified professional, and often the relevant authority.
- Determining how a floor should fall or where a drain may be positioned
- Judging whether your floor or the space beneath it suits this kind of work
- Establishing what waterproofing approach applies to your room, which varies locally
- Interpreting the guidance a manufacturer issues with a drain, screen or shower fitting you have chosen
- Deciding whether the room would suit a person with particular mobility needs
The checklist
Work through the sections
Tick the boxes on paper or on screen — nothing is stored, so print the page if you want to keep your marks.
1.What the household means when it says wet room
The phrase covers several very different rooms. Settling what you actually mean is the single most useful thing you can do at this stage.
Write down what each person in the household pictures when they say wet room, since one may mean a level floor throughout and another simply a shower without a tray.
The disagreement usually surfaces only once a drawing exists, by which point one version has quietly become the assumption everybody is working to.
Note whether a screen, a half wall or nothing at all is what you have in mind between the showering area and the rest of the room.
This single choice changes how far water travels, what the room feels like and how much of it has to be treated as a wet area.
Decide whether you imagine the whole floor falling towards a drain or only the showering part of it, and ask what each approach would involve in your room.
Owners often assume these are the same idea, and the difference affects doorways, thresholds and every fixture in the room.
How a floor is formed and drained is for qualified professionals to establish against the requirements that apply where you live.
Consider who uses this room and whether anyone in the household would find a level floor easier or harder than stepping over the edge of a tray.
Household observations about how people actually move in the room are information only you can supply.
Whether a room suits a person with particular needs is for a qualified professional to assess, not something this checklist can indicate.
Write down whether this is the only bathroom in the home, because that changes how much disruption the household can absorb if anything unexpected appears.
The answer shapes what is realistic here far more than any preference about appearance.
Note what first attracted you to the idea, whether that was easier cleaning, the look of the room or stepping in without a step, so the reason survives the detail.
Once the technical conversation starts, the original motivation is easily lost and decisions drift away from it.
2.How water would leave the floor
Drainage is the part owners think about last and professionals think about first. You cannot resolve it, but you can bring the observations that let someone else resolve it.
Ask where a drain would sit and what decides that position, then note the answer alongside where the shower outlet itself would be.
The drain and the outlet are not always in the same place, and understanding why prevents a layout being built on a wrong assumption.
Note where the waste from the current shower or bath leaves the room, and ask what moving that point would involve before assuming anything can be relocated.
Existing waste positions quietly decide what is straightforward, and they are visible now in a way they will not be later.
Ask what would happen to water that reaches the far side of the room, and whether the floor there would carry it back or simply hold it.
An open room spreads water further than people expect, and the answer decides how the whole floor has to be treated.
Consider how the drain would be reached for cleaning, what lifts out of it and where the hair and residue actually collect.
This is the part of a wet room the household deals with routinely, and it is rarely discussed before anything is ordered.
Ask whether the drain position depends on what lies under the floor, and record what you are told before treating any layout as settled.
Answers about the floor tend to arrive late and change things, so it is worth asking the question while the plan is still a sketch.
What lies beneath your floor and what it allows must be established by qualified professionals before any drainage position is assumed.
Write down whether this room sits above another room, under a roof or on the ground, since that answer changes the whole conversation about the floor.
It is the first thing a professional will ask, and having it recorded saves a return visit.
3.The floor build-up and the level at the door
Levels are where wet room plans meet the rest of the house. The doorway is the junction that causes the most trouble and gets the least attention.
Ask how the finished floor would sit compared with the floor today, and what that would mean at the doorway into the room.
A change of level at a threshold affects doors, flooring next door and how the room feels to walk into.
Note the floor level and finish in the adjoining space, and whether a change at the threshold would be noticeable underfoot or obvious to the eye.
The junction is easier to plan while the adjoining floor is still visible and undisturbed.
Ask what would stop water crossing the threshold into the adjoining floor finish, and record the answer instead of assuming a strip at the door resolves it.
Water reaching the floor next door is one of the most common regrets, and it is a question that can be asked at sketch stage.
How a threshold is formed in a room of this kind is for qualified professionals to establish against locally confirmed requirements.
Consider whether every door would still open and close once the floor build-up changes, and note which way each one currently swings.
Doors catching on a new floor are discovered at the worst possible moment, and the check is a simple one to make now.
Ask what the floor is being built on, what preparation the proposal assumes, and write down what you are told rather than trusting your recollection of the conversation.
Assumptions about the existing floor sit underneath every other decision in a wet room.
The condition of your existing floor and what it can carry is for a qualified professional to establish on site.
Note how skirting, architrave and the bottom of the door lining would meet the new floor, since those junctions are where trouble tends to show first.
Timber meeting a floor that gets wet is a detail nobody raises until it has already been formed.
4.Where water travels that nobody planned for
Without a tray and a screen the room behaves quite differently. Watching your current shower is the most useful research you can do.
Watch where water lands during a normal shower in the current room, including the wall opposite, the ceiling above and the floor beyond the tray edge.
Owners consistently underestimate spread, and an honest observation carries more weight than a description of the equipment you want.
Note what currently sits within reach of splash, such as a towel rail, a paper holder, a bin or the bottom edge of a cabinet.
These items are usually carried over into the new layout without anyone asking whether their position still works.
Consider whether a toilet and basin in the same open space would be regularly wetted, and decide whether the household finds that acceptable.
This is the single reality of open showering that people most often discover after the room is finished.
Ask what would keep water off the wall behind the basin, since that wall is used quite differently once there is no screen dividing the room.
Wall finishes chosen for a dry zone can end up in a wet one when the layout opens up.
Write down where somebody would put dry clothes and a towel before stepping in, and whether that surface would ever actually be dry.
Nowhere dry to put things down is the complaint most often heard about open showering areas.
Note whether the door itself would be within reach of spray, and what the face and back of that door are made of.
Doors are chosen for appearance and then exposed to conditions nobody described to the supplier.
Ask the manufacturer or supplier whether a door, screen or fitting is intended for the conditions in a room of this kind.
5.Drying the room between uses
An open wet floor is only pleasant if the room recovers between uses. That depends on air, warmth and what the household is willing to do each day.
Note whether the current room is still wet underfoot when the next person uses it, and who in the household that affects most.
This tells you what the room does today, which is better evidence than any claim about what a new one will do.
Ask what would move moist air out of this room and where it would go, without assuming the existing arrangement will cope with a larger wet area.
Ventilation is usually discussed after the layout is fixed, when the options have already narrowed.
How moist air should be dealt with in an open wet room is for qualified professionals to establish against the requirements that apply where you live.
Consider whether a warm floor is being discussed for comfort, for drying or for both, and write down which, since the reasoning behind each differs.
Being explicit about the purpose lets a professional answer the right question rather than a general one.
Note where towels would dry in a room where the floor may be wet, and whether that position is itself within reach of spray.
Towels in an open room often end up damp all the time, which quickly sours the household on the whole idea.
Ask what the household would need to do daily for the room to work as intended, then decide honestly whether anyone will do it.
Wet rooms that disappoint usually assume a squeegee habit nobody in the house actually has.
Write down whether the room has a window that opens and how often it is genuinely opened in cold weather.
A window nobody is willing to open in cold weather is not the drying arrangement people assume it to be.
6.Storage and everything that has to stay dry
In an open room the storage question changes completely. Everything either has a door in front of it or has to tolerate the conditions.
List what is stored in the current bathroom and mark the items that must never get wet, including paper, medicines and anything with a plug or battery.
The marked list is what shows whether a door in front of things is a preference here or a plain requirement.
Consider whether open shelving works in a room where spray travels, and note which items would need a door in front of them instead.
Open shelving photographs beautifully and is the first thing owners regret in an open showering room.
Ask what the underside and back of any fitted cabinet would be exposed to in this room, and put that question to the supplier before ordering anything.
Cabinet materials vary considerably in how they cope with moisture, and the supplier is the one who can answer for their product.
Cabinet materials vary, so ask the supplier directly what their product is intended to withstand in a room where the floor gets wet.
Note where the cleaning kit for this room would live, since an open wet floor usually needs one kept within reach rather than under a stair.
Upkeep that requires a trip to another room happens far less often than upkeep that does not.
Decide whether a bench or a seat is wanted in the showering area, and write down what it would actually be used for by whom.
Seats are often added for appearance and then found to be in the wrong place for the person who needed one.
Write down which items currently sit on the bathroom floor and would need a new home once that floor becomes a drainage surface.
Bins, baskets, scales and toy boxes rarely appear on a layout drawing, but they all have to go somewhere.
7.What to agree before covering work begins
Once surfaces close, the arrangement beneath them is invisible for the life of the room. These are the things to settle in writing beforehand.
Ask who is responsible for the waterproofing arrangement as a whole, and write that role down rather than assuming the tiler or the fitter owns it.
In many projects responsibility is split between trades, and the split is only discovered when something needs attention.
Ask for photographs at each stage before surfaces are covered, and agree in writing when those photographs will be taken and who keeps them.
This is the only record you will ever have of what is behind the tiles, and it is easy to request at the right moment.
Ask what the sequence of trades would be, and which of your decisions have to be final before that sequence begins.
Wet room work locks decisions earlier than a conventional bathroom, and knowing which ones prevents a change arriving too late.
Write down what you are told about how the arrangement is looked at before tiling starts, and who would be present when that happens.
Knowing the stage exists lets you ask to be told when it is happening rather than hearing about it afterwards.
Any testing and its result is a matter for the qualified people carrying out the work; nothing here specifies what should be done.
Ask what would happen if something unexpected is found once the floor is opened up, and how a change would be agreed and recorded at that point.
Opening a bathroom floor reveals things regularly, and agreeing the route in advance keeps the conversation calm.
Note what written information you would receive about the products used in the room, and who issues each part of it.
Product information is needed long afterwards by whoever attends to the room, and it disappears with the packaging.
Ask the people carrying out the work and the relevant local authority what records are expected for work of this kind.
Preparation
Documents and information to gather
Having these to hand usually makes the first conversation shorter and more useful.
- A sketch of the room showing where the existing waste leaves it and where the shower outlet sits today
- Photographs of the current room taken during and just after a shower, showing where water genuinely reaches
- Notes of the floor level and finish in the adjoining space, and the way every door into the room swings
- Anything you hold describing what the floor of this room is built on or what sits below it
- Manufacturer information for any drain, screen or fitting already under consideration
- A written list of what is stored in the room now, marked with the items that must stay dry
Records
Decisions to record before work begins
Write these down in your own words, with the date, so everyone is working from the same version.
- Whether a screen, a half wall or nothing is wanted between the showering area and the rest of the room
- Whether the whole floor or only part of it is intended to fall towards a drain
- Whether the toilet and basin being regularly wetted is acceptable to the household
- Whether a warm floor is wanted for comfort, for drying or for both
- What storage has to sit behind a door rather than on open shelving in this room
- Who you will treat as responsible for the waterproofing arrangement as a whole
Professional review
Questions to discuss with qualified professionals
Bring these to the relevant qualified professional, supplier or authority. Requirements vary by project and location.
- Where would a drain sit in this room, and what decides that position?
- What would the finished floor level be at the doorway compared with the floor next door?
- What does this floor need to be built on for the approach you are describing?
- How would moist air leave this room, and what would you want to know about the existing arrangement?
- Which of my decisions have to be final before the covering work begins?
- What photographs will be taken before anything is covered, and who will keep them?
- What happens if something unexpected is found once the floor is opened up?
- What written information will I receive about the products used in this room?
Blind spots
Commonly overlooked items
- The bottom of the door and its lining, meeting a floor that is now a drainage surface
- A paper holder left in the path of spray once the screen disappears
- Nowhere dry to put clothes and a towel down before stepping into an open area
- A drain that turns out to be awkward to lift and clean once the room is in daily use
- Bins, baskets and scales that used to sit on the floor and now have nowhere to go
- Assuming the existing ventilation will cope with a much larger wet area
- Nobody being named as responsible for the waterproofing arrangement as a whole
What this checklist does not do
- This checklist prepares a conversation about a wet room; it does not indicate how one should be formed, drained or waterproofed.
- Falls, drainage positions and floor build-ups depend entirely on your room and must be established by qualified professionals on site.
- Nothing here tells you what your floor can carry or what lies beneath it, which only a suitably qualified person examining the property can establish.
- Whether any waterproofing or ventilation approach suits your room is governed by requirements confirmed locally, not by anything written here.
More preparation
Related checklists
Inspiration
Related Ideas Library pages
Design directions to explore once the preparation is done.
Go deeper
Related Build Design Hub guides
Explanatory planning guidance behind the decisions on this page.
Bathroom Planning Checklists
Bathroom preparation checklists — fixture and layout decisions to discuss, moisture and ventilation questions to raise, and information to gather before professional review.
Browse all Bathroom Planning checklists →