Custom Porcelain Tile Shower
The 1990s fiberglass insert that has yellowed in the band where the showerhead runs every morning and has finally landed at the top of the punch list. The downstairs guest bath where a custom porcelain shower replaces a tub the family has not used in eight years. The master remodel where the new shower has to take aggressive cleaners, hold its design intent for two decades, and not require a re-seal every spring. Porcelain is the versatile, low-maintenance, design-flexible material that does most of the heavy lifting in residential custom shower builds — standard-format 4x4 through 12x12 on the walls, slip-resistant porcelain or a matched mosaic on the shower floor, set on a full Schluter KERDI sheet-membrane waterproofing assembly bonded to cement-board substrate. Mortar-bed pan with the slope built in (1/4 inch per foot to the drain) or a Schluter KERDI-SHOWER-T pre-formed tray on smaller alcoves. Niche and bench integration with full membrane wrap. Mapei Ultraflex 2 or Custom Versabond thinset on a 1/4-inch by 1/4-inch notched trowel, sanded grout matched to a 1/8-inch joint width, two coats of a penetrating sealer at the end. From $5,500 for a small alcove rebuild in 4x4 or 6x6 porcelain up to $11,000 for a three-wall walk-in with bench and recessed niche in 12x12 porcelain. Handis self-performs every tile-trade and membrane step; the in-wall mixer rough-in on a from-scratch build subs to a licensed Washington L&I plumber with the line item named on the quote.
Service
What a Custom Porcelain Tile Shower Build Includes
A custom porcelain tile shower is the from-scratch shower build in the versatile, low-maintenance, design-flexible porcelain material category — standard-format 4x4 through 12x12 porcelain on the walls, slip-resistant porcelain or a matched mosaic on the shower floor, full Schluter KERDI sheet-membrane waterproofing bonded to cement-board substrate, mortar-bed pan or pre-formed KERDI tray sloped 1/4 inch per foot to the drain, niche and bench integration with full membrane wrap, every tile set with Mapei Ultraflex 2 or Custom Versabond thinset on a 1/4-inch by 1/4-inch notched trowel, sanded grout matched to the joint width, and two coats of penetrating sealer at the end. Handis self-performs every step end to end. The in-wall mixer rough-in on a from-scratch build subs to a licensed Washington L&I plumber.
Why Porcelain for a Custom Shower
Porcelain is the residential tile category that absorbs less than 0.5 percent moisture (the ASTM C373 standard for impervious-grade tile), holds its design intent against aggressive cleaners (the way ceramic and natural stone do not), and is offered in every format, color, finish, and texture from every major tile manufacturer (Daltile, Bedrosians, Pental, Walker Zanger, Florim, Ann Sacks, Crossville). It costs less than natural stone, requires less special-case handling than large-format porcelain, and is the most common material category we set on a custom shower build. The 30-year shower install in a Seattle home is most often a porcelain build.
Substrate — Cement Board or KERDI-BOARD Over Studs
Existing shower walls demoed back to bare stud on every full custom build. Studs inspected for plumb and rot (sill plate especially — water tracks down inside a wall and rots the sill long before it shows on the surface). Subfloor inspected for soft spots and the pan slope verified before the new substrate goes up. Cement-board panels (1/2-inch HardiBacker or Durock) bonded to studs with screws and thinset at every panel seam, OR Schluter KERDI-BOARD pre-finished waterproof panels foamed at every seam. Cement-board substrate is the more common choice; KERDI-BOARD is the choice on curbless installs and on smaller alcoves where the substrate-and-membrane combination saves an install day.
Full Schluter KERDI Sheet-Membrane Waterproofing
Every cement-board surface gets bonded with Schluter KERDI orange polypropylene-fleece sheet membrane using unmodified thinset and a 1/4-inch by 3/16-inch notched trowel. KERDI-BAND on every seam between sheets. KERDI-BAND on every inside corner (wall-to-wall, wall-to-pan, wall-to-ceiling). KERDI-SEAL-PS flange around every penetration (mixer, showerhead, body-spray valves). KERDI-DRAIN at the drain with the bonding flange tied into the pan membrane. Curb wrapped on three sides (top, inside, outside). The membrane sits for 24 hours after the last bond before any tile goes up — you see the membrane assembly during this window if you want to walk it.
Mortar-Bed Pan Sloped 1/4 Inch Per Foot
Curbed showers get a mortar-bed pan with a sloped pre-pan (deck mud over a vapor-barrier layer), a PVC pan liner (40-mil Oatey or Noble Company TS) with the liner running 6 inches up the walls behind the cement board, and a deck-mud topping with the slope built in at 1/4 inch per foot to the drain. The slope is verified with a 4-foot level in three directions before the membrane wraps over the topping. The deck-mud topping cures 24 to 48 hours before KERDI bonds over it.
Niche and Bench Integration
Recessed niches built with pre-formed Schluter KERDI-BOARD niche panels foamed into a cut-out in the stud bay and seam-sealed, OR framed in a stud bay with cement board on every face and KERDI bonded over every surface (back, sides, top, bottom, lower lip). Niche floor sloped 1/8 inch to the front so water sheds out. Brushed-nickel, chrome, matte-black, or matched-tile bullnose trim at the niche rim. Built-in benches framed with treated lumber, cement-boarded, KERDI'd on every face, and seat-tiled with the same field porcelain.
Tile Setting — Mapei Ultraflex 2 or Custom Versabond
Standard porcelain (4x4, 6x6, 8x8, 12x12) on a 1/4-inch by 1/4-inch notched trowel with Mapei Ultraflex 2 or Custom Versabond modified thinset. Back-buttering on every tile sized 12x12 and up to hit the TCNA 95 percent thinset coverage standard. Joints kept consistent with 1/8-inch tile spacers (1/16 inch for rectified-edge porcelain, 3/16 inch for tile with irregular edges). Tile beat to plane with a rubber float. Thinset cures 24 hours before grout.
Sanded Grout Matched to Joint Width, Sealed After Cure
Sanded grout (Mapei Keracolor, Custom Polyblend Sanded, Laticrete Permacolor Select) for the 1/8-inch standard joint width. Unsanded grout for 1/16-inch joints on rectified-edge porcelain. Color matched to the design intent — we run a sample swatch on the install before committing if the color choice is borderline. Grout floated into every joint at 45 degrees, struck with a damp sponge in two passes, hazed off with a soft cloth after the grout sets up. Two coats of TileLab SurfaceGard or Aqua Mix Sealer's Choice Gold after the grout cures 24 to 72 hours. Second coat after the first cures 24 hours.
How a Custom Porcelain Shower Build Works
Eight sequential steps from the on-arrival substrate inspection through the final sealer pass — the actual sequence Handis runs on every custom porcelain tile shower build.
Substrate Inspection and Demo to Stud
Existing shower walls and pan demoed back to bare stud. Studs inspected for plumb and rot (sill plate especially). Subfloor inspected for soft spots. Any framing repair surfaced as a change-order before substrate goes up. Hidden rot from a previously leaking shower is not a surprise — it is documented before any new work proceeds.
Cement Board or KERDI-BOARD Substrate Over Studs
1/2-inch HardiBacker or Durock cement board screwed to studs and seam-thinset, OR Schluter KERDI-BOARD pre-finished waterproof panels foamed at every seam. Substrate set plumb and square. Panel seams staggered. Subfloor cement-boarded as well before the pan goes in.
Mortar-Bed Pan Built and Sloped 1/4 Inch Per Foot
Sloped pre-pan in deck mud over a vapor-barrier layer. 40-mil PVC pan liner running 6 inches up the walls. Deck-mud topping with the slope built in to 1/4 inch per foot to the drain, verified with a 4-foot level in three directions. Cures 24 to 48 hours before the membrane goes over.
Schluter KERDI Sheet Membrane Bonded to Every Surface
Orange KERDI polypropylene-fleece sheet bonded with unmodified thinset and a 1/4-inch by 3/16-inch notched trowel to every cement-board wall and the pan topping. KERDI-BAND on every sheet seam and inside corner. KERDI-SEAL-PS at every penetration. KERDI-DRAIN at the drain with the bonding flange tied into the pan. Curb wrapped on three sides.
Niche and Bench Wrapped Into the Membrane
Pre-formed KERDI-BOARD niches foamed into stud-bay cut-outs and seam-sealed, OR framed niches cement-boarded and KERDI-wrapped on every face. Niche floor sloped 1/8 inch to the front. Built-in benches framed with treated lumber, cement-boarded, KERDI'd on every face, seat-tiled with the field porcelain.
Set Porcelain Tile in Mapei Ultraflex 2 Thinset
Standard porcelain (4x4 through 12x12) on a 1/4-inch by 1/4-inch notched trowel. Back-butter every tile sized 12x12 and up to hit 95 percent thinset coverage per TCNA. Tile beat to plane with a rubber float, joints kept with 1/8-inch spacers (1/16 inch for rectified-edge porcelain). Cures 24 hours before grout.
Sanded Grout Matched to Joint Width
Sanded grout (Mapei Keracolor, Custom Polyblend, Laticrete Permacolor Select) for 1/8-inch joints, unsanded for 1/16-inch joints on rectified-edge porcelain. Color matched to the design. Floated into every joint at 45 degrees, struck in two damp-sponge passes, hazed off with a soft cloth after set-up.
Penetrating Sealer Applied in Two Coats
After grout cures 24 to 72 hours, two coats of TileLab SurfaceGard or Aqua Mix Sealer's Choice Gold wiped on with a clean cloth. Second coat after the first cures 24 hours. Sealer keeps soap film, body oil, and cleaning chemicals out of the grout pore network and extends the maintenance interval to multiple years.
Custom Porcelain Shower Pricing
Final pricing depends on the shower footprint (alcove vs walk-in vs three-wall), the porcelain format and material cost, the niche and bench scope, the pan style (mortar bed vs pre-formed tray), and whether the in-wall mixer is being replaced (licensed-plumber sub). Tile is line-itemed separately from labor on every quote so you see the material cost clearly. Request a free estimate for an accurate quote.
Tell us the shower footprint and the porcelain format you have in mind — we will quote the build with full Schluter KERDI waterproofing as standard.
Why Handis for Custom Porcelain Tile Showers
A custom porcelain shower is the project where the install detail decides the 30-year outcome. The pretty 12x12 porcelain field is what the project is about for the homeowner; the membrane assembly underneath is what makes it last a generation. Handis builds every porcelain shower with full Schluter KERDI sheet-membrane waterproofing on every cement-board wall and the pan, KERDI-BAND on every seam and inside corner, KERDI-SEAL-PS flanges at every penetration, niche and bench wrapped into the assembly, and a mortar-bed pan with the slope verified by a 4-foot level before the membrane goes over it. You see the membrane assembly before any tile bonds over it. The porcelain is what shows; the KERDI is what lasts.
Full Schluter KERDI sheet-membrane waterproofing on every build
Cement board is a substrate, not a membrane. Every Handis porcelain shower gets Schluter KERDI orange polypropylene-fleece sheet bonded to cement-board substrate with unmodified thinset and a 1/4-inch by 3/16-inch notched trowel, with KERDI-BAND on every sheet seam and inside corner, KERDI-SEAL-PS flanges at every penetration, and KERDI-DRAIN tied into the pan. You see the membrane assembly before any tile goes over it.
Mortar-bed pan with the slope built in and verified
Curbed showers get a mortar-bed pan — sloped pre-pan over a vapor-barrier layer, 40-mil PVC pan liner running 6 inches up the walls, deck-mud topping with the slope built in to 1/4 inch per foot to the drain. The slope is verified with a 4-foot level in three directions before any membrane wraps over the topping. The deck-mud topping cures 24 to 48 hours before KERDI bonds over it. The slope failure is a non-starter on a Handis install.
Niche and bench wrapped into the membrane
Recessed niches built with Schluter KERDI-BOARD pre-forms foamed in place and seam-sealed, OR framed in a stud bay with cement board on every face and KERDI bonded over every surface (back, sides, top, bottom, lower lip). Niche floor sloped 1/8 inch to the front for water shedding. Bench wrapped on every face with the seat-tile bonded to the KERDI. Every penetration into a wet wall becomes a potential leak path without the membrane wrap; every penetration on a Handis install has the wrap.
Mapei Ultraflex 2 or Custom Versabond thinset on every tile
Standard porcelain (4x4 through 12x12) set with Mapei Ultraflex 2 or Custom Versabond modified thinset on a 1/4-inch by 1/4-inch notched trowel. Back-buttering on every tile sized 12x12 and up to hit the TCNA 95 percent thinset-coverage standard. The thinset and trowel match the format on every install — no one-bag-for-everything compromise.
Honest in-wall plumbing handoff, named on the quote
The in-wall mixer or shower valve rough-in on a from-scratch porcelain shower build subs to a licensed Washington L&I plumber. Their hours and their portion of the cost are named line by line on the quote. On a re-tile project where the existing valve stays in place, no plumbing sub is needed and Handis handles the project Handis-only. Permits are pulled by the plumber as the responsible licensed party.
Estimate
Tell us the shower footprint (alcove, single-wall walk-in, two-wall walk-in, three-wall walk-in), the porcelain format you have in mind (4x4, 6x6, 8x8, 12x12), the niche and bench scope (none, single niche, niche plus bench, multi-niche), the pan style (curbed standard or curbless), whether the in-wall mixer is staying or being replaced, and any known issues with the existing shower (active leak, soft floor, ceiling stain below). We send a clear estimate with full Schluter KERDI waterproofing as standard and the licensed-plumber portion named line by line on any new-mixer scope.
Customer Reviews
Recent custom porcelain shower reviews from verified Handis customers.
Custom porcelain walk-in shower in our 1985 split-level master remodel. Handis demoed the old fiberglass insert, found rot in the sill plate from a slow leak we did not know about, repaired the framing, set Schluter KERDI on the walls and the pan, and tiled in 12x12 porcelain. The membrane assembly sat for 24 hours before tile went up — they showed it to us, walked us through every seam. Two years in, dead-tight install.
Two-wall porcelain walk-in in our Bellevue downstairs guest bath. We had a tub there that the family had not used in eight years. Handis demoed the tub, framed the new walk-in opening, set the full KERDI assembly, installed 8x8 porcelain on the walls and slip-resistant porcelain on the pan, hung a frameless glass panel at the entry. Eight working days, on schedule, on budget.
Three-wall porcelain shower with a built-in bench and recessed niche in our Mercer Island remodel. The bench was for aging-in-place even though we did not need it yet. Handis built the bench framed and treated, KERDI'd on every face, seat-tiled in the same 12x12 porcelain as the walls. The niche has brushed-nickel Schluter trim that matches the shower mixer. Looks like a designer shower; built like a contractor shower.
Small alcove porcelain shower rebuild in our 1925 craftsman hall bath. The original tub was rusted out and not worth saving. Handis put in a standard 60-inch alcove shower with a pre-formed KERDI-SHOWER-T tray (saved us a day on the build) and 6x6 white porcelain in a stacked pattern. Came in at $5,800 with the niche add-on. Period-appropriate without the period-appropriate maintenance.
Porcelain master shower with a mosaic shower floor upgrade. The 12x12 porcelain on the walls and a small penny-round mosaic on the floor for slip resistance plus the design accent. Handis used a sloped mortar pan with the mosaic over the slope, no lippage anywhere, drain centered cleanly. The mosaic was the upgrade I went back and forth on — glad I did it, the floor is the design moment of the shower.
Frequently Asked Questions
Common questions about Handis custom porcelain tile shower builds — material choice, waterproofing, niche options, scheduling, and pricing.