How to Tile a Floor: Subfloor Check, Membrane, Layout, Setting, Grout
Tiling a 200 sq ft floor yourself: $1,480–$1,540 in tile, membrane, mortar, grout and a saw rental, 30–45 hours.
- Check the floor before buying tile: stiff enough (joists and subfloor), flat to 1/8 inch in 10 feet, dry. Cement board or an uncoupling membrane over plywood — never tile to bare wood.
- Lay it out dry first: center the room or the main sightline, avoid slivers at the walls and doorways, and use a 33% offset on 12 × 24 tile, not 50%.
- Mix thinset to peanut butter, comb it in one direction, back-butter anything 12 × 24 or bigger, set with leveling clips, and check coverage by lifting the first tile.
- Grout the next day, seal cementitious grout, silicone the perimeter and the changes of plane, and stay off it a day. A floor is 30–45 hours over a week; the mortar sets the pace.
Before you start
Read the cost comparison first. A floor is the tile job that pays to do yourself — about $1,510 for a 200 sq ft kitchen in materials, a saw rental and tools you keep, against $3,000 from a setter, and $545 against $850 for a bathroom floor. The time is 30–45 hours for the kitchen, spread over a week by cure times, and the technique is learnable in the first ten square feet.
This guide is for a floor in porcelain or ceramic, 12 × 24 or smaller, over a sound subfloor. A shower is a different project — it’s a waterproofing system with tile on it, and the site’s verdict is to hire it. So is 24 × 48 tile, natural stone, mosaics and patterns, and any floor that needs self-leveler or repair first.
What you need
Tile with 10% extra from one dye lot, an uncoupling membrane or cement board, the right thinset for each layer, grout and sealer, silicone, a leveling system of clips and wedges, spacers and transitions. Tools: a wet saw (rent it, or buy one past a single room), two notched trowels and a margin trowel, a grout float and sponges, a mixing paddle, nippers and a hole saw, knee pads, and the level, chalk line and drill you own. The priced list is on the cost page.
The three things that decide how the floor turns out
What’s under it. Stiff, flat, dry, and covered with board or membrane. Every cracked tile floor is a subfloor story.
Coverage. Combed mortar, a back-buttered tile, pressed and slid. Lift the first one. Hollow spots crack under a dropped pan two years from now.
Flatness across the joints. A 33% offset on big tile, clips and wedges, a straightedge while the mortar’s wet. Lippage is the difference between a floor that looks professional and one that looks like a first try, and it’s decided in the twenty minutes before each patch sets.
Step by step
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Check the floor and plan the height
Bounce test and a deflection check for the joist span; a 10-foot straightedge for flatness (1/8 inch in 10 feet, no hump over 1/16 in 2 feet for big tile). Measure how much height the tile, mortar and membrane add and check doors, the toilet flange, appliances and the transitions. Fix, sister or level now, not later.
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Demo, clean, and undercut the jambs
Old flooring out, staples and nails pulled, subfloor screwed down tight where it squeaks, swept and vacuumed. Undercut door jambs and casings with an oscillating tool on a scrap of tile plus membrane so the tile slides under.
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Install the membrane or backer board
Membrane: spread unmodified thinset with the notch the manufacturer specifies, roll the sheet into it, and embed it with a float or a roller, then tape the seams if it's a wet area. Cement board: thinset under it, screws every 8 inches, seams taped and mudded. Let it set.
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Dry layout and lines
Lay tile dry from the center or the main sightline, with spacers, in both directions; adjust so cuts at the walls are similar and none is a sliver. Snap chalk lines for the first row and a perpendicular. On 12 × 24, plan a 33% offset.
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Mix and set the first rows
Mix the right mortar, slake, remix. Comb a patch in straight lines, back-butter the tile, set it to the line, press and slide, and clip it to its neighbors. Pull one up early and check coverage. Work away from the room's exit; keep joints and surfaces clean as you go — mortar in a joint or on a face is much harder tomorrow.
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Cuts
Measure each cut in place, mark, and cut on the wet saw; nippers and a grinder for curves and the toilet flange. Cut edges go against walls and under trim. Set the cuts as you reach them so the field mortar doesn't skin over.
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Cure, then grout
Stay off it 24 hours. Snap off the clips, scrape any mortar out of the joints, vacuum. Grout in sections, scrape, wait, sponge, haze. Silicone at the perimeter and any inside corner. Seal cement grout after it cures, 48–72 hours.
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Transitions, trim, and the toilet
Set transition strips at each doorway, reinstall baseboard or shoe molding to hide the perimeter gap, trim doors. Reset the toilet on a flange extender if the floor rose more than 1/4 inch, with a new wax ring. Walk on it lightly for a day; furniture after two.
What would this cost you? The tile installation calculator prices the DIY version with the tools you already own and a value on your time, next to a pro quote.
Frequently asked questions
How do I know if my floor is stiff enough for tile?
The industry limit is deflection of L/360 — the span in inches divided by 360 — under load, which for a 12-foot joist span is 0.4 inches. In practice: 2 × 10 joists on 16-inch centers with 3/4-inch plywood is fine for ceramic and porcelain; 2 × 8s on a long span, or a floor that bounces when you walk on it, isn't, and needs sistering or a second layer of plywood. Natural stone needs L/720. Deflection calculators are online; a floor that flexes cracks grout first and tile second.
Cement board or an uncoupling membrane?
Either works over plywood; the membrane is faster and thinner. Cement board (1/4 inch on floors) is screwed down over a bed of thinset with the seams taped and mudded, adds stiffness, and is cheap. An uncoupling membrane (Ditra and its equivalents) is bonded with unmodified thinset, adds 1/8 inch, isolates the tile from subfloor movement better, and doubles as a vapor barrier over concrete. On a floor with a lot of doorways and height concerns, the membrane; on a budget, the board.
How do I lay out the tile?
Dry-lay a row each direction from the center of the room, or from the most visible line — a hallway, a doorway you look through, a long wall — and see where the cuts land. Shift the layout so the cuts at opposite walls are similar and no cut is under a third of a tile. On 12 × 24 tile, offset the joints by a third, not half; big tiles bow in the middle and a 50% offset puts the high center next to the low end. Snap chalk lines for the first row and work off them, not the walls.
How do I mix and spread thinset?
Use the mortar the bag says for your tile and substrate — unmodified under and over most membranes, modified elsewhere, large-and-heavy-tile mortar for anything over 15 inches. Add powder to water, mix with a paddle to a peanut-butter consistency, let it slake ten minutes, remix. Spread with the flat side, then comb with the notched side in one direction — straight lines, not swirls — so air can escape when the tile is pressed in. Work in patches you can tile in 15–20 minutes before it skins.
What's back-buttering and do I need to do it?
A thin skim coat of thinset on the back of the tile before setting it, which fills the texture and guarantees contact. Do it on anything 12 × 24 or bigger, on all porcelain, and always in a wet area. Set the tile, press and slide it slightly across the trowel lines to collapse the ridges, then pull up the first one and look: 80% coverage on a dry floor, 95% in a wet area or on large tile. If you see trowel lines with gaps, you need more mortar or a bigger notch.
How do I keep the tiles level with each other?
A flat substrate first — a leveling system corrects lippage between tiles, not a hump in the floor. Then clips under each edge with wedges or caps tightened as you go, on any tile 12 inches or bigger. Check across joints with a straightedge before the mortar sets; an eighth of an inch at a joint is what a toe catches and a sock snags on. Snap the clips off the next day.
When do I grout, and which grout?
After the mortar's cured — 24 hours for most, or per the bag. Cement grout, sanded for joints over 1/8 inch, is cheap and needs sealing; pre-mixed or urethane is easier and pricier; epoxy is the most stain-proof and the hardest to work. Push it in diagonally with a float, scrape off the excess, wait until it firms, wipe with a barely damp sponge in light passes, then haze off with a microfiber. Silicone, not grout, at the perimeter and at every corner where two planes meet. Seal cement grout after it cures.
Sources
- Tile and Stone Setters (SOC 47-2044), Occupational Employment and Wage Statistics , U.S. Bureau of Labor Statistics, 2026-04
- How Much Does Tile Installation Cost? , HomeGuide, 2026-09
- How Much Does It Cost to Install a Tile Floor? , HomeGuide, 2026-09
- How Much Does Tile Installation Cost? , Angi, 2026-09
- How Much Does Ceramic or Porcelain Tile Installation Cost? , HomeAdvisor, 2026-09
- Cost to Install Ceramic Tiles , This Old House, 2026-09
- TCNA Handbook for Ceramic, Glass, and Stone Tile Installation , Tile Council of North America, 2026-09
- Certified Tile Installer Program , Ceramic Tile Education Foundation, 2026-09
Figures last reviewed . See how we estimate.