A walk-in shower reads as the simplest bathroom upgrade there is — take out the tub, open the space, glass it in — and it's the one where the gap between how it looks and how it's built is widest. Everything that decides whether the shower lasts twenty years or leaks into the framing in two happens under the tile and behind the wall, in a layered waterproofing assembly the finished room never shows. On Collin County's slab-on-grade homes, getting there is a small, tightly sequenced build, not a fixture swap, which is why it belongs to one accountable team rather than a relay of trades each guessing at the last one's work.

Curbless on a slab is a real construction decision

The look everyone wants now is curbless — a zero-threshold floor that runs unbroken from the bathroom into the shower — and on a slab foundation that's the hardest version to build honestly. A true curbless entry needs the shower floor to sit lower than the surrounding tile so it can slope to the drain without a curb to hold water back. On these homes that means either recessing the pan into the slab, which is cut-and-re-pour structural work, or building up the rest of the bathroom floor to create the fall. A linear drain set against one wall solves much of it by letting the whole pan slope in a single plane toward a slot instead of pitching to a center point from four directions — cleaner for the large-format tile most of these conversions use, and far more forgiving on a curbless layout. A low-curb design, where a short threshold does the water management, is the pragmatic middle path when depressing the slab isn't worth it.

The waterproofing assembly the tile hides

Whatever the entry, the shower is a waterproofing system with tile stuck to the front of it. The pan has to slope its quarter-inch per foot to the drain; a continuous membrane — sheet or liquid-applied — has to seal the pan and carry up the walls with every seam and corner sealed; backer board replaces drywall inside the wet zone; and the whole thing gets flood-tested to hold water before a single tile goes up. Skip or rush that layer and the failure stays invisible for a season, then arrives as rotted studs and a stain on the ceiling below. This is exactly where low-bid work comes apart: the tile looks perfect, and the assembly behind it was never built to code. The frameless glass, the niche, and the bench are the easy part once the box behind them is sound.

Ventilation, because North Texas earns it

A sealed tile shower on a humid slab-on-grade home has nowhere to shed moisture but into the framing unless it's actively pulled out. Code wants an exhaust fan sized to the room and ducted all the way to the exterior — not dumped into the attic, where it only relocates the mold problem out of sight. On these tighter, well-sealed 1990s and 2000s homes, that fan and a real vapor plan are what keep new grout lines from going black within a couple of seasons. Waterproofing keeps water out of the wall; ventilation gets the rest of it out of the room. You need both.

Permits, drains, and the one team that owns the seams

The moment a conversion moves or alters the shower drain — and a curbless or relocated layout almost always does — it's cutting into the slab and pulling a plumbing permit, with a licensed plumber filing and a rough-in inspection before the walls close. Our bathroom remodeling crews run this the same way across the county, whether the job is in Allen through the city's Citizen Self-Service portal or in Plano through Building Inspections; the desk changes, the sequence doesn't, and our guide to building permits in Collin County walks through which counter you're standing at. On a room this compact the failures live in the handoffs — the slope that has to be right before the membrane, the flood test that has to pass before the tile — and a design-build general contractor exists to own every one of them.

Common questions

Can you build a truly curbless shower on a slab foundation? Yes, but it takes real structural work: either recessing the pan into the slab so the floor can slope without a curb, or building up the surrounding bathroom floor to create the fall. A linear drain against one wall makes it far more achievable by letting the pan slope in a single plane. It's very doable — it just isn't a cosmetic change, which is why the layout has to be locked before demo.

Do open walk-in showers leak more than an enclosed tub-and-shower? No, not when they're built to code. Leaks come from a skipped or shortcut waterproofing layer, not from the open design — a properly sloped pan, a continuous membrane, and a flood test before tile hold water regardless of whether there's a door. An open shower simply makes proper drainage and ventilation more important, not more likely to fail.

Do I need a permit for a walk-in shower conversion? If the work moves or alters the drain or supply lines — which most conversions do — yes. Relocating a drain on a slab pulls a plumbing permit and a rough-in inspection, and the electrical for the fan and any new lighting permits under the job too. A same-footprint re-tile that touches no plumbing is a lighter track, but a real walk-in conversion rarely stays that simple.

Is a walk-in shower a good aging-in-place choice? It's the natural time to make it one. A curbless entry, blocking set into the studs for future grab bars, a bench, and slip-resistant flooring are ordinary decisions while the walls are open and near-impossible retrofits once the tile is set. Building those in now costs little and keeps the room usable for decades.

The Remo Guys runs kitchens and baths as one design-build team — one crew owning the plan from the slope of the pan to the last pane of glass, remodeling homes across Collin County since 2019, insured and bonded, with that single line of accountability as the whole point.