A wet room bathroom in a Chicago home typically costs between $18,000 and $48,000 for a small to mid-size bathroom, and $45,000 to $75,000 or more for a primary bath. The price is driven less by square footage and more by what happens under the tile: recessing the subfloor so the floor sits level, sloping it to a linear drain, and waterproofing the entire room with a continuous membrane. In older Chicago bungalows, two-flats, and greystones, the condition of the floor joists is the single biggest cost variable.
Key Takeaways
- A wet room waterproofs the whole bathroom floor, not just the shower area, and removes the curb, tray, and enclosure.
- Expect a wet room to cost roughly 20 to 40 percent more than a comparable curbless walk-in shower in the same room.
- Linear drains are the most common choice because they allow a single-direction slope and larger floor tile.
- The waterproofing membrane must be continuous, bonded to the drain, carried up the walls, and flood tested before tile.
- Joist depth, joist condition, and deflection decide whether a true level-entry floor is possible in an older home.
Wet rooms have moved from European hotel bathrooms into Chicago homes for good reasons. They make small bathrooms feel larger, remove the step that becomes a hazard as people age, and give a clean, open look that a framed shower with a curb never will. They also carry more risk than any other bathroom layout if they are built poorly, because the entire floor becomes a shower pan.
This guide explains what a wet room actually is, how it compares to a walk-in shower, what it costs in Chicago, how the layout and drain choices work, how a full waterproofing system is installed, and what has to be checked in the joists and subfloor of an older Chicago home before anyone promises you a level, step-free floor.
What Is a Wet Room Bathroom?
A wet room is a bathroom where the shower is not a separate unit. There is no shower tray, no curb, and usually no full enclosure. The shower area sits on the same plane as the rest of the bathroom floor, the floor is sloped toward a drain, and the whole room is waterproofed as if it were one large shower.
In practice, most Chicago wet rooms use a single fixed glass panel to keep spray off the vanity and toilet, but water is still allowed to reach the floor outside that panel. That is the defining feature: the room is designed to get wet, and every surface below the tile is built to handle it.
There are two common versions:
- Full wet room: The entire floor is waterproofed and sloped, and the toilet, vanity, and shower share one continuous tiled surface.
- Wet zone or partial wet room: A defined area holds the shower and often a freestanding tub behind glass, while the rest of the bathroom stays a conventional dry floor with a membrane underneath for protection.
Wet Room vs Walk-In Shower: What Is the Difference?
The terms get mixed up constantly, so here is the plain comparison. A walk-in shower is a shower you enter without a door, and it can have a low curb or no curb at all. A wet room goes further by treating the entire bathroom floor as a wet area.
| Feature | Wet Room | Curbless Walk-In Shower | Standard Walk-In Shower |
|---|---|---|---|
| Curb or threshold | None | None | Low curb, usually 2 to 4 inches |
| Waterproofed area | Entire bathroom floor plus wall bases | Shower zone plus a margin outside it | Shower zone only |
| Glass | One fixed panel or none | Fixed panel or door | Panel, door, or full enclosure |
| Floor slope | Shower zone and often the whole room | Shower zone only | Shower pan only |
| Subfloor work | Recess or build-up across the room | Recess in the shower zone | Usually none |
| Relative cost | Highest | Middle | Lowest |
| Best fit | Small bathrooms, aging in place, modern design | Most remodels that want step-free entry | Budget-focused tub-to-shower conversions |
If your main goal is simply a step-free shower, a curbless walk-in may give you 90 percent of the benefit at a lower cost. If you want the whole room to read as one open, water-ready space, or the bathroom is too small for a separate shower footprint, a wet room is the stronger choice. Our article on building a curbless shower before you actually need one covers the accessibility side of that decision in more depth.
Wet Room Bathroom Cost in Chicago
The ranges below reflect typical 2026 pricing for professionally built wet rooms in Chicago and the surrounding suburbs, including demolition, subfloor work, plumbing, full waterproofing, tile, a glass panel, ventilation, and permits. They assume mid-range to upper mid-range finishes.
| Bathroom Size | Typical Square Footage | Full Wet Room Range | Common Situation |
|---|---|---|---|
| Small hall bath | 35 to 50 sq ft | $18,000 to $32,000 | Bungalow or two-flat bath replacing a tub alcove |
| Mid-size bath | 50 to 80 sq ft | $28,000 to $48,000 | Suburban second bath or condo main bath |
| Primary bath | 80 to 120 sq ft | $45,000 to $75,000 | Wet zone with shower and freestanding tub |
| Large luxury bath | 120 sq ft and up | $70,000 to $120,000+ | Natural stone, heated floors, multiple shower heads |
| Partial wet zone | Any size | $20,000 to $40,000 | Glassed shower and tub zone, rest of room stays dry |
Notice that a small wet room can cost nearly as much per square foot as a large one, and often more. A bathroom concentrates plumbing, drainage, waterproofing, electrical, and tile into a tight space, so the fixed costs do not shrink much when the room gets smaller. For a broader look at how scope drives price, see what a bathroom remodel costs in Chicago.
Line-Item Cost Breakdown
| Cost Item | Typical Chicago Range | What Drives It |
|---|---|---|
| Demolition and haul-away | $1,500 to $4,000 | Old mortar-set tile, cast iron tubs, building access |
| Joist and subfloor work | $2,000 to $8,000 | Recessing the floor, sistering joists, new sheathing |
| Drain relocation and plumbing rough-in | $2,500 to $7,000 | Distance to the stack, joist direction, venting |
| Linear drain assembly, installed | $800 to $2,500 | Length, grate style, tile-in versus standard grate |
| Waterproofing membrane system, full room | $2,000 to $5,500 | Room size, sheet versus liquid system, flood testing |
| Sloped mortar bed or pre-sloped foam board | $1,200 to $4,000 | Single slope versus multi-direction slope |
| Tile, materials and installation | $5,000 to $20,000+ | Porcelain versus natural stone, tile size, pattern |
| Fixed glass panel | $1,200 to $4,000 | Size, low-iron glass, hardware finish |
| Exhaust fan, electrical, GFCI protection | $800 to $2,500 | Venting route to the exterior, new circuits |
| Heated floor (optional) | $1,200 to $3,500 | Area covered, thermostat, dedicated circuit |
| Permits and inspections | $500 to $2,500 | City of Chicago versus suburban village rules |
What Pushes a Chicago Wet Room Toward the Top of the Range
- Undersized or damaged joists that need sistering or reinforcement before a recess is possible.
- Moving the toilet, which requires a 3 or 4 inch drain line at proper slope back to the stack.
- Natural stone floors, which need a much stiffer floor than porcelain and more careful installation.
- Condo and high-rise rules, including board approval, sound-rated underlayment, and limited work hours.
- Hidden water damage from decades of failed grout and leaking tub drains, which is common in older Chicago bathrooms.
Planning tip: In homes built before the 1960s, set aside a contingency of 10 to 15 percent of the project budget for what is found once the old floor comes up. Our article on what we find behind the walls in Chicago’s older bathrooms shows the most common surprises.
Wet Room Layout: Floor Slope and Drain Options
Every wet room layout decision comes back to one question: where does the water go, and how does the floor get it there? The answer sets the drain type, the tile size, and how much subfloor work is needed.
Full-Room Slope vs Zoned Slope
The shower area needs a consistent slope toward the drain. The standard plumbing code requirement for a shower floor is at least 1/4 inch of fall per foot toward the drain. Outside the shower zone, designers have two choices:
- Zoned slope: Only the shower area is sloped. The rest of the floor is flat but still fully membraned. This is the most common approach and keeps the floor comfortable to walk on.
- Full-room slope: The entire floor falls gently toward one drain. This suits very small rooms where the shower takes up most of the floor, but it makes vanity and toilet placement more complicated.
Drain Options Compared
| Drain Type | How the Floor Slopes | Tile Size | Best Use |
|---|---|---|---|
| Linear drain at the back wall | One direction, a single plane | Large format tile works well | Most wet rooms and curbless showers |
| Linear drain at the entry | One direction, away from the shower head | Large format tile works well | Narrow rooms where the drain also catches water heading out |
| Center point drain | Four directions, like a shallow funnel | Small tile or mosaic needed to follow the slope | Traditional look, lower drain cost |
| Tile-in linear drain | One direction | Floor tile continues over the grate | Premium designs where the drain should nearly disappear |
Linear drains have become the default for Chicago wet rooms because a single-direction slope is easier to build accurately, needs less floor depth, and lets you run 12 by 24 inch or larger porcelain tile across the floor without awkward cuts.
Small Bathroom Wet Room Layout Ideas
Wet rooms shine in the 5 by 7 and 5 by 8 foot bathrooms found throughout Chicago bungalows and two-flats. A few layouts that work well:
- Shower at the far end: Put the shower where the old tub was, add a linear drain along the back wall, and use a short fixed glass panel to protect the toilet.
- Wall-hung vanity and toilet: Keeping fixtures off the floor makes the room feel larger and lets water run under them to the drain without obstruction.
- Recessed niches instead of shelves: Niches built into the wall framing keep the room clean and leave the floor open.
- Toilet farthest from the spray: Arrange fixtures so the toilet and toilet paper holder sit outside the direct splash zone.
Curbless Wet Room Waterproofing: The Full Membrane Process
Tile and grout are not waterproof. Grout absorbs water every time the shower runs, so the protection in a wet room comes entirely from the layer behind the tile. In a wet room, that layer covers the whole floor, which is why the process has to be done in the right order with compatible products. AMG Proline explains its own standard in why we won’t cut corners on waterproofing, and the steps below show how a full system comes together.
- Confirm the structure. Joists are inspected, reinforced where needed, and the floor is checked for stiffness before any slope is built.
- Install the subfloor and drain body. The recessed or rebuilt subfloor goes in, and the drain body is set at the correct height for the final slope.
- Build the slope. A sloped mortar bed or a pre-sloped foam board system creates a consistent fall to the drain with no flat spots or reverse pitch.
- Prepare the walls. Cement board or foam backer replaces drywall on wet walls, with all seams and fasteners treated per the manufacturer.
- Apply the membrane across the entire floor. A sheet or liquid membrane rated to ANSI A118.10 is applied continuously across the floor, with no gaps between the shower zone and the rest of the room.
- Carry the membrane up the walls. In the shower zone, it runs to full shower height or above the shower head. Around the rest of the room, it turns up the walls as a protective base.
- Seal corners, seams, and penetrations. Preformed corners, seam tape, and pipe collars are installed at every inside corner, valve, and shower head opening.
- Bond the membrane to the drain. The membrane is tied directly into the drain’s bonding flange so water on top of the membrane can only exit through the drain.
- Flood test. The floor is plugged and filled with water for at least 24 hours, and the water level is checked before any tile is set.
- Tile with care for the membrane. Tile is set with mortar compatible with the membrane, and movement joints are placed at perimeters and changes of plane.
Why single-system matters: Mixing a membrane from one manufacturer with a drain or board from another is one of the most common reasons wet rooms fail. A complete system from one manufacturer has been tested together and is typically required to keep its warranty valid.
Joist and Subfloor Checks in Older Chicago Homes
A wet room only works if the finished floor can sit level, or nearly level, with the hallway outside. In new construction, builders plan for this. In a 1920s bungalow, a 1910s two-flat, or a greystone, the floor was never designed for it. These are the checks that decide what is possible.
Joist Size, Spacing, and Direction
Many older Chicago homes have 2×8 or 2×10 joists at 16 inches on center. To recess a floor for a level entry, the tops of the joists are often lowered within the shower or wet zone and new support is added. Whether that is safe depends on joist depth, span, and which way the joists run relative to the drain. A drain line that has to cross joists is far more involved than one that runs between them.
Deflection Limits for Tile
Tile floors need a stiff floor. The industry standard for ceramic and porcelain tile is a deflection limit of L/360, and natural stone requires a much stiffer L/720. Older joists that have been notched for past plumbing or weakened by long-term leaks often fall short. Sistering new lumber alongside the old joists is the usual fix.
Rot, Old Notches, and Previous Repairs
Once the old tile and mortar bed come up, it is common to find rotted subfloor around the toilet flange, joists cut deeply for old drain lines, or earlier repairs that were never properly supported. All of this is repaired before the new slope is built.
When a True Level Entry Is Not Possible
If the joists cannot be safely recessed, there are still good options:
- Thin pre-sloped systems that need far less depth than a traditional mortar bed.
- Building up the surrounding floor slightly so the bathroom and shower meet at the same height.
- A gentle transition at the doorway instead of a step, which keeps the room nearly level.
- Cutting a trench in a concrete slab for basement wet rooms, where the drain is set in the slab and the floor is patched to slope.
Permits and Code Points for Chicago Wet Rooms
Because a wet room almost always involves new or relocated drains, it will usually require a permit in the City of Chicago and in most suburbs. Key points that come up in inspections:
- Correct drain size, slope, and venting for any relocated fixture.
- An exhaust fan vented to the exterior, never into an attic or soffit, sized to clear moisture from an open-plan wet room.
- GFCI protection on receptacles and safe clearance between outlets and the wet area.
- Safety-rated tempered glass for the shower panel.
- The rough-in inspection must pass before the waterproofing and tile cover the plumbing.
For a room-by-room view of what needs a permit, see do you need a permit for a Chicago kitchen or bath remodel.
Is a Wet Room Worth It? Honest Pros and Cons
| Advantages | Trade-Offs |
|---|---|
| Makes small bathrooms look and feel larger | Costs more than a standard or curbless walk-in shower |
| Step-free access for aging in place and mobility needs | Towels, toilet paper, and the vanity need splash protection |
| Easy to clean, with no tray, curb, or track | Floor outside the shower can stay wet longer without good ventilation |
| Fewer seams and edges for mold to start | Unforgiving of poor workmanship, since the whole floor is a pan |
| Modern, high-end appearance | If it is the only bathroom, some buyers may still want a tub elsewhere |
A wet room makes the most sense for homeowners who plan to stay in the home for years, want step-free access, or are working with a tight bathroom footprint. It makes less sense when the budget is tight and a standard walk-in shower would solve the real problem.
How to Plan a Wet Room Project in Chicago
- Decide between a full wet room and a wet zone. This choice affects cost more than any finish selection.
- Get the floor structure assessed early. Joist depth and direction determine whether a level entry is achievable.
- Choose the drain before the tile. A linear drain opens up large format tile options. A center drain requires smaller tile.
- Select slip-resistant floor tile. Ask for tile rated for wet areas, and consider smaller formats in the shower zone for better grip.
- Plan the glass. A fixed panel is usually enough. Our glass shower door team can size it so spray stays inside the shower zone.
- Plan ventilation and heat. A properly sized exhaust fan and an optional heated floor help the room dry quickly after every use.
- Confirm permits and building approvals. In condos, start the association approval process before design is final.
Conclusion
A wet room bathroom is one of the most practical upgrades a Chicago homeowner can make, especially in the small, older bathrooms common across the city and its suburbs. It opens up space, removes the step into the shower, and gives the room a clean, modern feel. The real value of a wet room, though, is decided by work you never see after the tile goes down: a sound and stiff floor structure, a consistent slope to a well-placed drain, and a continuous, flood-tested waterproofing membrane across the entire room.
For budgeting, plan on roughly $18,000 to $48,000 for most small and mid-size Chicago wet rooms, and more for primary baths, natural stone, or homes where joists need reinforcement. Get the structure assessed before you commit to a design, choose a drain that suits your tile and layout, and insist on a single, tested waterproofing system. Done that way, a wet room will stay watertight and comfortable for decades.
Frequently Asked Questions About Wet Room Bathrooms in Chicago
How much does a wet room bathroom cost in Chicago?
Most small to mid-size wet rooms in Chicago cost between $18,000 and $48,000, while primary bathroom wet rooms usually run $45,000 to $75,000 or more. The biggest variables are subfloor and joist work, whether drains or the toilet move, the tile you choose, and how much hidden damage is found once the old floor is removed.
Is a wet room more expensive than a walk-in shower?
Yes. A wet room typically costs about 20 to 40 percent more than a curbless walk-in shower in the same bathroom. The difference comes from waterproofing the entire floor instead of just the shower zone, extra subfloor work to keep the whole room level, and more careful slope planning across the room.
Can I put a wet room in a small bathroom?
Yes, and small bathrooms are often where wet rooms work best. Removing the tub and shower enclosure frees up floor space, and a single fixed glass panel keeps the room open. A 5 by 7 or 5 by 8 foot bathroom can become a comfortable wet room with a linear drain, a wall-hung vanity, and careful placement of the toilet away from the spray.
Does a wet room need a linear drain?
No, but a linear drain is the most common choice. It lets the floor slope in one direction, which is easier to build accurately and allows large format tile. A center point drain also works, but it requires a four-way slope and usually smaller tile or mosaic to follow the angles.
How is a wet room waterproofed?
A wet room is waterproofed with a continuous membrane, rated to ANSI A118.10, across the entire floor and up the walls. The membrane is bonded to the drain flange, sealed at every corner and pipe opening, and then flood tested for at least 24 hours before any tile is installed. Using one manufacturer’s complete system helps prevent failures at the joints between products.
Will a wet room work in an older Chicago bungalow or two-flat?
Usually yes, but the floor structure has to be checked first. Older homes often have 2×8 or 2×10 joists that may be notched or weakened by past leaks. Joists may need sistering before the floor can be recessed. If a full recess is not possible, a thin pre-sloped system or a gentle transition at the doorway can still deliver a nearly level wet room.
Do I need a permit for a wet room in Chicago?
In most cases, yes. Wet rooms almost always involve new or relocated drains, and plumbing changes require a permit in the City of Chicago and in most suburbs. The rough-in plumbing inspection must pass before waterproofing and tile cover the work, and licensed plumbers file their portion of the permit under their own license.
Can a wet room be built in a Chicago condo or high-rise?
Often yes, but with extra steps. Most associations require board approval, a certificate of insurance, and sound-rated underlayment under new tile. Many buildings restrict moving drains because the shared stack cannot move, and recessing a concrete floor may not be permitted, so condo wet rooms often rely on thin pre-sloped systems and existing drain locations.
Does the whole bathroom floor get wet in a wet room?
Not usually. A well-designed wet room keeps most water inside the shower zone using a fixed glass panel and a correctly placed linear drain. The rest of the floor is waterproofed so occasional splashes cause no harm, and good ventilation lets the room dry quickly after each use.
Do wet rooms add resale value in Chicago?
A well-built wet room can make a bathroom more appealing, especially to buyers who value accessibility and modern design. The main caution is the only-tub question: if the wet room replaces the only bathtub in the home, some families with young children may prefer a tub elsewhere. If the home has a second bathroom with a tub, that concern largely goes away.
How long does a wet room remodel take?
Most Chicago wet room projects take about four to eight weeks on site, depending on structural work and permit inspections. Design, selections, and permit review usually happen before demolition. Custom glass is measured after the tile is finished, which can add one to two weeks at the end of the project.
Can a wet room be built over a concrete basement slab?
Yes. In a basement, a trench is cut in the concrete slab to set the drain and connect it to the existing drain line, then the slab is patched and sloped to the drain. Basement wet rooms also need careful attention to moisture coming up through the slab, so a vapor-tolerant membrane system and strong ventilation are important.
Planning a Wet Room or Curbless Shower in Chicago?
AMG Proline assesses the floor structure, plans the slope and drain, and builds the full waterproofing system with one crew from our Crestwood showroom. Learn more about our walk-in and curbless shower installation or call (708) 979-3298.
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