Replacing a Tub-Shower Combo With a Walk-In Shower

The standard tub-shower combo — a 60-inch alcove with a tub basin below and a showerhead above — is the single most common bathing setup in the 1960s–80s ranch and tract homes that fill our region. It is also the most common thing our clients ask us to remove. Once the kids are grown, or the knees start to protest that 15-inch tub wall, that basin becomes an obstacle you step over twice a day for a bath nobody takes anymore. Converting it to a full walk-in shower is a tub-to-shower conversion that reuses the space you already have — and this guide is about the decisions that shape the result, not just the price.

The good news is that the combo is the ideal starting point. It already has a three-wall alcove, a showerhead, and drain plumbing roughed into the right zone. You are not building a shower from scratch; you are rebuilding an alcove you already own. That means the project is defined less by demolition and more by four clean choices: keep or change the footprint, curb or curbless, what kind of glass, and which finish tier. Get those right and the rest follows.

Why homeowners make this exact switch

A tub-shower combo conversion is driven by three motivations that usually overlap. The first is accessibility: a low-curb or curbless walk-in removes the tub wall you have to lift a leg over, which is the most common cause of bathroom slips as balance changes with age. The second is the look — a combo reads as dated the moment you walk in, while an open walk-in with large-format tile and a glass panel feels current and makes a small bathroom feel larger. The third, and the one people mention most after the fact, is cleaning: no tub basin to lean into, no sliding-door track full of grime, and no tub-to-surround caulk seam constantly growing mildew.

There is also a space dividend that surprises people. A tub basin forces you to stand inside a bowl; a walk-in gives you the full floor of the alcove to stand on. You feel the difference immediately, even though the room did not get one inch bigger. In a compact 5-by-8 bathroom — the standard footprint across so much of our older housing stock — that psychological gain is worth as much as the physical one.

Decision 1: Keep the 60-inch alcove or change the footprint

The easiest, most cost-effective conversion keeps the existing 60-inch-wide alcove exactly where it is. The framing is already there, the plumbing is roughed into the right wall, and a 60-inch walk-in is a genuinely comfortable size — wide enough for a bench at one end and a recessed niche without feeling cramped. For the large majority of our clients, keeping the footprint is the right call.

Changing it is possible but pushes you into a different project. Shrinking the opening to steal a foot for a linen cabinet, or widening it into an adjacent closet, means reframing walls and relocating supply and drain lines — more labor, more permit scope, and a longer timeline. That work can absolutely be worth it in a full bathroom remodel, but if your goal is simply "remove the tub, give me a great walk-in," the in-place 60-inch conversion delivers most of the benefit for a fraction of the disruption.

Decision 2: Curb or curbless

This is the choice that most affects both cost and feel. A low curb is the default: a modest threshold, typically 3 to 4 inches, that contains water simply and works in any bathroom with no structural changes. It is the value choice and it is what most combo conversions use.

A curbless (zero-threshold) shower is the aging-in-place and modern-design upgrade. The shower floor sits flush with the bathroom floor, so there is nothing to step over and nothing to trip on. The catch, on the slab-on-grade homes common across Roseville, Citrus Heights, and much of Sacramento County, is that a flush floor means recessing the slab or building up the surrounding floor so the shower can pitch to a drain below the finished surface. That is real concrete and waterproofing work, and it is why curbless carries a premium. If accessibility now or in the near future is a genuine priority — or you simply love the seamless look — it is worth it. If not, a low curb is the sensible default.

Decision 3: What kind of glass

A walk-in still needs something to keep spray off the vanity and floor, but you have a spectrum of options, and it drives both cost and the open feeling you are usually after.

• Fixed glass panel (walk-in panel). A single stationary panel, often 30–34 inches wide, that shields the wettest zone while leaving the alcove open at the other end. It keeps the airy, modern look most combo-converters want and has no track or door to clean.
• Framed sliding or hinged door. A metal-framed door set into the original alcove opening. It fully encloses the shower and is the most budget-friendly enclosure, though the frame and track need regular cleaning in our hard-water region.
• Frameless enclosure. Heavy tempered glass with minimal hardware for a clean, high-end finish. It is the premium option and the easiest to keep looking new, since there is little metal for mineral scale to cling to. Our companion guide on replacing shower glass with frameless covers that upgrade in detail.

Decision 4: Finish tier and what it costs

Where your conversion lands on price depends mostly on the wall material and how much changes behind the wall — not on brand names alone. These are honest 2026 planning ranges for the Sacramento–Placer market, estimates rather than quotes, for a conversion that keeps the existing 60-inch alcove.

• $7,000–$10,500 — Basic acrylic walk-in. Acrylic wall panels and a low-threshold pan built into the existing alcove, often reusing the drain zone and a new valve. Fast, watertight, and the value leader.
• $12,000–$19,000 — Mid-range tiled walk-in. Custom tile on a waterproof membrane, a sloped pan, a relocated center drain, a new pressure-balanced valve, and a fixed glass panel or framed door. This is the most popular tier and where design choices start to matter.
• $20,000–$34,000 — Curbless / luxury build. A zero-threshold walk-in with a linear drain, large-format or specialty tile, frameless glass, a bench and niche, and the slab-recessing and heavier waterproofing a flush floor requires.

If you want the number broken down line item by line item — demolition, drain relocation, waterproofing, tile, glass, permits — our cost to replace a bathtub with a shower guide walks the full itemized breakdown and the hidden costs that catch homeowners off guard.

What the process looks like

A permitted tiled combo conversion moves through a predictable sequence. Knowing it helps you understand where the days go and why waterproofing sets the pace.

1. Demolition. The tub basin, surround, and any water-damaged backer or framing come out. This is when hidden mold behind an old combo surround gets discovered — the caulk seam at the tub lip is a classic slow-leak point.
2. Rough plumbing. The tub-spout line is capped, a new shower valve is set at standing height, the drain is relocated toward center (or to a wall for a linear drain) and upsized to the code-required 2 inches, and the inspector signs off before anything is closed up.
3. Waterproofing & pan. The membrane goes on, the pan is sloped to drain, and the assembly is flood-tested. On a curbless build the floor is recessed first. This step cannot be rushed.
4. Tile & grout. Walls and floor are set, grouted, and given cure time.
5. Glass, fixtures & final inspection. The panel or enclosure and trim go in, and the final inspection closes the permit.

What changes behind the wall

Because a combo already has a showerhead, homeowners sometimes assume the plumbing carries over untouched. It rarely does. A combo runs on a tub-and-shower valve with a diverter and a tub spout, and a walk-in needs none of that — the tub-spout line gets capped and a proper shower valve, usually pressure-balanced to meet current code, takes its place at a higher position. The drain almost always moves, since a tub drain sits at one end of the 60-inch run while a shower drain belongs near the center. And in pre-1990 homes, whatever we find behind the surround — original copper, galvanized pipe, marginal venting, or hidden rot — dictates how much rough plumbing the job actually needs. That is why an honest estimate always starts at demolition-readiness, not from a photo.

The resale rule: keep one tub in the home

The one caution worth repeating is about your last tub. A walk-in conversion is almost always a win for daily life and for resale — unless it leaves the house with no bathtub at all. Buyers with young children frequently filter listings for at least one tub, and a home without one can quietly lose part of its market. Our standing advice is simple: keep one bathtub somewhere in the house — typically a hall or kids bathroom — and convert the primary suite or a secondary full bath to the walk-in you actually use. Follow that rule and you get the shower you want without giving up the buyer you will eventually need. You can compare this against every other option in our full shower replacement guides before you commit.

Getting an accurate estimate

The ranges and decisions in this guide are honest planning tools, but your real cost depends on your drain location, the age of your plumbing, whether your home is on a slab, and what a demolition reveals behind the combo surround — none of which a price chart can see. As a 5.0★-rated, licensed bathroom-only remodeler (#1125321) based in Rocklin, Oakwood Remodeling Group has converted hundreds of bathrooms across Placer and Sacramento counties, and every estimate we give starts with someone standing in your bathroom. When you are ready for a firm number tailored to your alcove, request a free in-home estimate and we will walk the space, talk through the curb, glass, and footprint choices, and put a real range in writing before any work begins.