How Much Does a Curbless Shower Cost in Boise? (2026)

The short answer

Fixr (2025) prices walk-in shower installation nationally at $5,000–$11,000, averaging $8,000, with premium builds running up to $20,000 — and notes that going curbless or barrier-free "doesn't usually add much to the cost," pricing that configuration at an average of $6,000 within its overall walk-in range.

This Old House (2026) frames it differently: its walk-in shower range runs $4,000–$20,000 (average $12,000), and it states plainly that a curbless design "requires subfloor modification to create a proper drainage slope," and that the added structural work and expanded waterproofing "typically increases labor costs and pushes the project into a higher pricing tier." The two sources aren't contradicting each other so much as describing different scopes of curbless build — a straightforward pan swap versus a full subfloor rework — which is exactly why the range is wide.

Why the floor construction changes

A standard shower pan sits on top of the subfloor behind a curb, which contains water within the pan itself. Remove the curb and the floor has to do that job instead: the pan area gets recessed into (or built up around, on the room side) the subfloor so the finished shower floor and the surrounding bathroom floor end up level, with slope built into the recessed section to carry water to the drain.

On a home with a framed floor over a crawlspace or basement, that recess is typically cut into the floor joists — which is a job for a licensed contractor, not a tile setter, since it touches structural framing. On a slab-on-grade floor, the equivalent work means cutting into the concrete slab itself. Either way, this framing or slab work is the main reason This Old House frames curbless as pushing a project into a higher pricing tier: it is added structural labor that a standard curbed shower never requires.

Cost by shower type

Bob Vila's 2023 shower installation guide prices an accessible, curbless-entry shower meeting ADA no-threshold requirements separately from a standard walk-in build.

Linear drains and waterproofing

Curbless showers are almost always built with a linear drain rather than a central point drain, and that choice affects both labor and finish. Schluter, a waterproofing and drain manufacturer, explains that a linear drain lets the shower floor slope in a single plane toward one edge, rather than sloping down from all four directions toward a center drain — which in turn makes it possible to use large-format tile that would otherwise need to be cut to fit a multi-directional slope.

Because the curbless floor sits flush with the rest of the room, waterproofing has to extend further than it would behind a curb. This Old House (2026) prices a waterproofing system at $800–$1,500 installed and notes that curbless designs in open, wet-room-style layouts require full waterproofing of the bathroom floor, not just the shower pan. Bob Vila (2023) separately prices drain line installation at $1,000–$7,000 and general plumbing fixture modifications at $600–$1,600 per fixture — costs that apply whether or not the shower is curbless, but that scale with how much of the existing drain layout has to change.

• Linear drain: enables single-plane floor slope and supports large-format tile (Schluter, manufacturer)
• Waterproofing system: $800–$1,500 installed; curbless/open layouts need full-floor coverage, not just the pan (This Old House, 2026)
• Drain line installation: $1,000–$7,000, depending on routing (Bob Vila, 2023)
• Plumbing fixture modification: $600–$1,600 per fixture (Bob Vila, 2023)

What Boise Bath publishes

Boise Bath doesn't publish a standalone rate for a curbless shower — it's built as a configuration of a Walk-In / Custom Tile Shower, which is published at $12,000–$22,000. Based on the national data above, the curbless entry itself is not usually the largest line item; the floor recess or joist work, the linear drain, and the extended waterproofing are what typically move a given project toward the upper end of that published range rather than the lower end. For the underlying shower build cost, see our walk-in shower cost guide and our Boise bathroom remodel cost guide.