Bathroom floors take water from every direction: drips from the shower, splashes at the sink and the occasional toilet overflow. Cracked tile, vinyl lifting at the edges, grout that won’t come clean and a soft spot near the toilet are all signs the floor is telling you something about what’s underneath.

What’s under the floor matters most

A bathroom floor sits on either a concrete slab or a wood subfloor over joists, and each fails in its own way. On a slab, cracks in the concrete can telegraph through tile unless an uncoupling or crack-isolation membrane goes down first. On a wood floor, a slow leak at the toilet’s wax ring can soften the subfloor long before you notice.

The toilet comes up during any floor replacement, so the flange and subfloor around it are checked at that point. Damage that reaches into the floor framing is evaluated before the new floor goes down.

Tile also needs a stiff floor, and natural stone needs a stiffer one than ceramic or porcelain. A wood subfloor that’s fine for porcelain may not be ready for marble, so that’s worth assessing in person before you settle on a particular stone.

Older homes and old flooring

In older homes, vinyl flooring and the adhesive under it can contain asbestos. You can’t tell by looking, and EPA advises having suspect material sampled by a trained, accredited professional before remodeling disturbs it. Our guide to remodeling older Fresno homes covers this and other common surprises.

Older bathrooms may also have original tile set on a thick mortar bed, which affects how the new floor meets the hallway. Transition height is planned so the doorway doesn’t end up with a lip and the toilet flange sits at the right height for the new floor. A higher floor can also mean trimming the door, and it’s worth leaving a gap: the Home Ventilating Institute suggests at least 3/4 inch of clearance under a bathroom door so the exhaust fan can pull in replacement air.

Choosing a floor material

Porcelain and ceramic tile

Porcelain is dense and absorbs very little water, so it works on bathroom floors and shower floors alike. Ceramic is softer and suits bathroom floors when it’s rated for floor use. Both come in wood-look planks and stone looks. Color-body porcelain, tinted through more of its thickness, hides small chips better than tile whose color sits only in the glaze.

Natural stone

Marble, travertine and slate need sealing, gentle cleaners and a stiffer floor. Polished stone is slick when wet, while honed or tumbled finishes give more grip.

Luxury vinyl plank

LVP is warmer and softer underfoot, and many products are waterproof on the surface. Water that sits can still work through seams and edges to the subfloor, so it suits a half bath or a bathroom with a separate shower better than a floor that gets soaked every day, and it doesn’t go inside the shower. Our LVP vs tile comparison goes deeper.

Base and edges

Where the floor meets the wall, a tile base or a well-sealed painted baseboard handles mop water better than bare wood trim. At the doorway, a stone or solid-surface threshold makes a clean transition to hallway flooring of a different height.

Grip, tile size and warmth

For bathroom floors, look for tile with a wet DCOF of 0.42 or higher, the tile industry’s benchmark for level indoor floors that get walked on when wet. Matte and textured finishes help, and glossy tile is better kept to the walls.

Large-format tiles show fewer grout lines but need a very flat floor. Small tiles handle minor unevenness and give more traction, which is why they’re common on shower floors.

Electric radiant heat goes under tile or stone as a thin mat or cable system on a thermostat, and it takes the chill off a tile floor on winter mornings. In most bathrooms it’s used for comfort rather than as the main heat source, and a programmable thermostat can warm the floor before you’re up. It needs ground-fault protection and often a dedicated circuit, and adding a circuit involves licensed electrical trades and gets assessed at the in-home consultation.

Floors in the estimator, and what they add

Floors are handled through the tile question in the bathroom estimator: “Standard Tile & Flooring” covers quality ceramic, porcelain and flooring options, and “Custom / Specialty Tile” covers handcrafted, imported, natural stone and specialty tile. If the floor is the main change, choose “Keep Existing” for the shower or tub and the vanity if they stay. A heated floor that needs a new circuit belongs in the plumbing and electrical answer, at “Minor Changes” or above.

Floors are priced within the whole bathroom rather than as a separate line. Most bathroom projects with us start around $15,000, and about $25,000 is typical for a full bathroom remodel. Natural stone, intricate patterns, subfloor repair and heated floors add to a range, while porcelain in a simple layout keeps it down.

Installation order, and timing it with other work

The toilet and usually the vanity come out so the new floor runs continuously under them. The old floor is removed, the slab or subfloor is repaired and prepared, a membrane or underlayment goes down, then tile and grout, and the fixtures go back with a new wax ring. The setting material and grout need time to cure before heavy use, so the toilet goes back only when the floor is ready for it.

If the vanity, toilet or shower will need replacing soon, doing the floor first means cutting into new tile later. Planning the floor with the rest of the room usually makes more sense, and our pages on shower tile and waterproofing and accessible bathrooms cover related upgrades. The bathroom remodeling overview shows the full scope.