Wet Room Design Guide (Twin Cities 2026)

Wet rooms are the single most-requested upgrade we're seeing in luxury Twin Cities primary baths in 2026. Five years ago, a client asking for a "wet room" usually meant they'd seen one on a UK home reno show and weren't sure if it would work in a Minneapolis Tudor. Today, we're building two or three a year in Edina, Wayzata, Linden Hills, and Kenwood, and the calls keep coming. This guide is what we tell every homeowner before we hand them a quote, because a wet room is the most unforgiving build in residential construction. Done right, it's the best room in the house. Done wrong, you're tearing out subfloor in three years.

What a wet room actually is

A wet room is a fully waterproofed bathroom where the shower area has no curb, no enclosure, and often no glass at all. The entire floor slopes to a drain (or multiple drains), and the walls, floor, and sometimes the ceiling are tiled and sealed as a continuous waterproof envelope. The whole bathroom is, in effect, the inside of a shower pan.

That's the part most homeowners get. The part they miss: a wet room is not just "a bathroom with a curbless shower." A curbless showerhas a defined wet zone, usually with a linear drain and a glass panel keeping water in. A true wet room treats the entire floor as a drainage plane. The toilet, the vanity, and sometimes the freestanding tub all sit inside the waterproof envelope. If you splash water across the room while showering, nothing bad happens. That's the point.

Why they're trending in luxury Twin Cities primary baths

We're building wet rooms almost exclusively in higher-end primary suites: Edina Country Club Tudors, Wayzata lakeshore new builds, the bigger Kenwood and Linden Hills renovations, and the occasional Crocus Hill Victorian where the owners gutted the second floor. A few reasons it's exploded here:

• The spa aesthetic. A wet room with a freestanding tub inside the wet zone, large-format porcelain on every surface, and a rainhead overhead reads as a five-star hotel bathroom. Clients have seen them at the Four Seasons or on European trips and want it at home.
• Aging-in-place that doesn't look medical. Boomers in Edina and Wayzata are renovating with a 20-year horizon. Curbless wet rooms are the most elegant version of barrier-free design. No curb to trip over, no shower door to maneuver around, room for a bench or a wheelchair if it ever comes to that.
• Older floor plans force the issue. A lot of South Minneapolis bungalows and St. Paul Tudors have tiny primary baths with awkward chimney chases and knee walls. Going wet-room-style is sometimes the only way to make a 50-square-foot bath feel open.
• Easier to clean. No shower door tracks, no curb to scrub, no glass to squeegee if you skip the panel. Sounds minor, sells more wet rooms than anything else.

Drainage and slope design

This is where wet rooms succeed or fail. The entire bathroom floor has to slope to a drain at a minimum of 1/4 inch per foot. In a 10x10 wet room, that's a non-trivial amount of slope to hide. We typically use one of three drainage strategies:

• Single linear drain at the perimeter. Best for rectangular rooms. The entire floor slopes one direction toward a 36-to-60 inch linear drain along a wall. Cleanest look, easiest to tile with large format.
• Linear drain at the shower zone plus a secondary point drain near the toilet. What we use most often in retrofits. The shower zone gets the serious slope, the rest of the room gets a gentler 1/8 inch per foot toward a backup drain.
• Center point drain with four-way slope. Old-school, rarely a good idea in residential. Hard to tile, harder to walk on, and visually busy.

In retrofits, the slope question gets ugly fast. Most Twin Cities homes built before 1960 don't have enough joist depth to drop the subfloor for proper slope without sistering or replacing joists. We've had Highland Park Tudors where we had to raise the rest of the bathroom floor two inches to get the slope we needed at the shower end. Budget accordingly.

Waterproofing: Schluter-Kerdi everywhere

We are Schluter-certified, and we will not build a wet room with anything else. In a normal shower, you can argue about hot mop vs sheet membrane vs liquid applied. In a wet room, where the toilet flange, the vanity drain, and the tub feet all penetrate the waterproof envelope, you want a system with proven, manufacturer-warrantied detailing at every penetration.

Kerdi membrane goes over the entire floor, up every wall to at least 7 feet (we usually run it to the ceiling), and across the ceiling if the shower has a rainhead or steam. Every seam gets Kerdi-Band. Every corner gets a preformed Kerdi corner. The drain is a Kerdi-Drain with the integrated bonding flange. Niches, benches, curbs (if there are any low thresholds), and pipe penetrations all get factory-made Schluter pieces.

The reason: in a wet room, water doesn't politely stay in the shower zone. It splashes, it pools, it tracks. The waterproof system has to survive 20 years of being wet five days a week. Liquid-applied systems can pinhole. Mud beds and traditional pans rely on a slope being perfect over a long timeline. Kerdi gives us a continuous, mechanically reliable membrane with documented warranty coverage. See our tile shower waterproofing guide for the deeper rabbit hole.

Tile choice: porcelain, large format, slip rating

Tile selection in a wet room is structural, not decorative. Three rules we don't bend on:

• Porcelain only on the floor. Natural stone (marble, travertine, limestone) is porous, etches with soap, and stains over time in a wet environment. Some clients still insist on marble walls, and we'll do it. But the floor is porcelain, always.
• Large format on walls, smaller format on floors. 24x48 or 24x24 porcelain on walls gives the seamless spa look. On the floor, you need smaller tiles (typically 4x4 to 12x12) so the grout joints can articulate around the slope. Try to put a 24x48 on a sloped floor and you'll lippage yourself into a callback.
• DCOF of at least 0.42 wet. That's the ANSI standard for slip resistance. Manufacturer spec sheets list it. Polished porcelain on a sloped wet floor is a lawsuit waiting to happen. Matte, textured, or honed finishes only.

Cambria isn't a tile, but since we get asked: yes, you can use a Cambria quartz slab as a wall surround in a wet room. We've done it in a Wayzata project with bookmatched Cambria Brittanicca behind the tub. It's spectacular and it's expensive. Cambria is made in Le Sueur, Minnesota, and lead times have been steady. More on slab vs tile in our countertops overview and quartz vs granite piece.

Glass panel vs fully open

About 60% of the wet rooms we build have a single fixed glass panel separating the shower zone from the rest of the room. The other 40% are fully open. Here's how we coach clients:

• Single fixed panel (10mm low-iron glass, no door, no track): controls overspray, keeps the toilet and vanity drier, makes the room more comfortable in winter when the rest of the bathroom is cold. This is what we recommend for most Twin Cities clients.
• Fully open: stunning, magazine-worthy, and slightly impractical. Only works if (a) the room is big enough that the shower zone is genuinely far from the toilet and vanity, (b) ventilation is excellent, and (c) you have heated floors so cold air at the ankles isn't a constant problem.

Heated floors are mandatory

We will not build a wet room in Minnesota without electric radiant floor heat under the tile. This is not optional. Three reasons:

1. Comfort. A 65 degree porcelain floor in February is brutal. Heated floors run at 80 to 85 degrees and turn the room into the place you actually want to be at 6am.
2. Drying. Wet rooms stay wet. Heated floors evaporate standing water and surface moisture in 20 to 30 minutes after a shower, which keeps grout and waterproofing cleaner and longer-lived.
3. Resale. In Edina, Wayzata, and Linden Hills, heated bathroom floors are now table stakes in the over-$1.5M segment. A wet room without them is a deduction.

We typically spec Schluter Ditra-Heat, which integrates with the Kerdi waterproofing and adds a decoupling layer, so it's a structural win as well as a comfort one. Wi-Fi thermostats with a programmable schedule are standard.

Ventilation requirements

A wet room generates roughly twice the airborne moisture of a standard bathroom because the entire floor area is evaporating water after every shower. Standard 80 CFM bath fans don't cut it.

We spec a minimum of 150 CFM, ducted in rigid metal (never flex) directly to the exterior. For wet rooms over 100 square feet or with steam showers, we go to 200 CFM or higher and often add a humidity-sensing controller that runs the fan automatically until the room hits a target relative humidity. We also recommend a timer override at the switch so the fan runs for at least 30 minutes after each shower.

In older homes (Crocus Hill Victorians, Lowry Hill Tudors), getting a vent duct to the exterior can mean running through a roof gable or sistering it into an existing chase. Plan for it. A wet room with bad ventilation grows mildew on the grout and ruins the wood casing on every door within 15 feet.

Cost ranges: $25K to $70K+ in the Twin Cities

Wet rooms are not cheap. Here's how the numbers shake out in 2026 Twin Cities pricing:

Compared with a standard bathroom remodel (typically $25K to $50K, see our bathroom remodel cost breakdown), wet rooms add 30 to 50% to the budget. The drivers: waterproofing labor, joist or subfloor work to achieve slope, heated floors, larger fans, and higher tile counts because the entire room is finished surface.

When wet rooms work and when they fail

We turn down wet room projects when the conditions aren't right. Here's our internal checklist:

Good candidates:

• New construction or full gut renovation where we control the subfloor
• Primary baths over 60 square feet (smaller works but is less comfortable)
• Slab-on-grade or basement baths where slope is easy to engineer
• Homes where the owners have a 10+ year horizon and care about longevity
• Renovations where we're already doing structural work (sistering joists, raising floors)

Bad candidates:

• Tiny 35-square-foot half-bath conversions where slope eats the room
• Second-floor retrofits in 1920s bungalows with shallow joists and no access from below
• Homes the owners are planning to sell within 3 to 5 years (the ROI math is bad)
• Households with very young kids and no separate kid bathroom (a wet floor near a toilet at 2am is rough)
• Anyone who flinches at the budget. A "value engineered" wet room is the most expensive bathroom you can build because you'll redo it in five years

How a wet room differs from a curbless shower

This is the question we get most often, so a clean comparison:

A curbless shower is a feature inside a bathroom. A wet room is a category of bathroom. If you only want easier access and a cleaner look at the shower, you want a curbless shower. If you want the entire room to behave like a spa, you want a wet room. If you're converting an old tub alcove, our tub-to-shower conversion guide is the better starting point.

FAQ

Will the toilet and vanity get wet?

A little, if there's no glass panel. With a single fixed panel, almost not at all. The toilet and vanity are still inside the waterproof envelope, so even occasional splashing is fine. We use wall-hung toilets and floating vanities in most wet rooms, which keeps water off the bases and makes floor cleaning trivial.

Can I do a wet room in a second-floor bathroom of a 1920s Linden Hills bungalow?

Sometimes. The deciding factor is joist depth and access. If we can get into the ceiling below or if the joists are deep enough to drop the subfloor, yes. If neither is true, we'll usually steer you to a curbless shower instead and keep the rest of the bath conventional. We do a free in-home assessment before quoting anything in older housing stock.

How long does a wet room build take?

Eight to fourteen weeks from demo to final punch list, depending on scope and tile lead times. Slab walls (Cambria, natural stone) can add 3 to 6 weeks. Steam adds 1 to 2 weeks. We sequence the project with our general contractor team running all trades in house, so the schedule stays tight.

What's the warranty?

Schluter offers a 10-year system warranty on the Kerdi waterproofing when installed by a certified installer (which we are). We add a 2-year workmanship warranty on top of that, covering tile, grout, and finish carpentry. Plumbing fixtures carry manufacturer warranties (typically 5 to lifetime).

Does a wet room add resale value in the Twin Cities?

In the over-$1M segment in Edina, Wayzata, Kenwood, Linden Hills, Highland Park, and Crocus Hill, yes. A well-built wet room is a feature listing agents lead with. Below the $750K mark, the math gets thinner because buyers in that range value a second tub more than a spa shower. We'll tell you straight up if your home's comp set doesn't support the spend.

Wet rooms are the most demanding bathroom we build, and they're also the ones clients love most. If you're thinking about one in a Twin Cities primary suite (renovation or new build), we'd like to walk the space with you before you commit to a layout. Get in touch through our contact page, and in the meantime, the bathroom remodeling overview and our curbless shower guide are the best companion reads to this one.