Shower Bath Remodel: Complete Guide for Homeowners

The 2025 NKBA cost survey put the median bathroom remodel at $13,800 for a midrange refresh and $36,500 for a higher-end gut. A shower bath remodel can range from a $4,500 weekend tub-surround swap to a $35,000 full gut with custom tile, heated floors, and a steam shower. The variance comes down to how much demolition you sign up for, what hides behind the existing walls, and how realistic the scope creep budget actually is. This guide walks the categories so you scope honestly before the first sledgehammer swing.

Three Remodel Tiers That Most Homeowners Choose

Tier one: surface refresh ($1,200 to $5,500). New vanity, replaced toilet, new lighting, painted walls, possibly an acrylic tub liner over existing tub. Two to four days of work. No tile, no plumbing relocations. Best for rental properties or homes you’ll sell within five years.

Tier two: shower replacement or tub-to-shower conversion ($4,500 to $14,500). Demo the existing tub and surround, waterproof properly, tile new walls and floor, install a new drain and trap. One to two weeks of work. Permits required in most jurisdictions. The right tier for the most common bathroom problem — a 1980s fiberglass tub-shower combo that nobody likes.

Tier three: full bathroom gut ($14,000 to $40,000+). Strip walls and floor to studs and subfloor, relocate plumbing as needed, replace tub or shower, retile, new vanity, new fixtures, new lighting and electrical, possibly heated floors. Three to six weeks of work. Required for any major layout change or any home older than 1985 where plumbing or electrical needs updating to current code.

Tub-to-Shower Conversion: The Most Common Remodel

Conversion of a standard 60 by 32-inch alcove tub to a curbless or curb-style walk-in shower runs $5,500 to $14,500. The variation traces to substrate, drain repositioning, and tile choice. The tub gets removed, the drain pipe relocated 12 to 18 inches toward the center of the new shower pan, and the walls and floor get waterproofed using a system like Schluter Kerdi or Wedi.

Material costs break down roughly: Schluter Kerdi shower kit with linear drain ($429 to $689), thinset and grout ($120), tile ($300 to $1,800 depending on selection), shower valve trim ($150 to $600), glass enclosure ($1,200 to $3,500), and miscellaneous trim and waterproofing ($200 to $400). Labor runs $3,200 to $7,500 for an experienced tile setter and plumber pair.

Curbless showers (no threshold) require dropping the subfloor 1.5 to 2 inches in the shower area, which means cutting joists or sistering on a 2×4 ledger. Budget another $800 to $1,500 if you want a true ADA-friendly zero-entry shower in an upper-floor bathroom.

Waterproofing: The Step Most Failures Trace To

Cement board (Durock, HardieBacker, WonderBoard) is water-resistant, not waterproof. Used alone behind tile, it lets moisture migrate to studs and subfloor over time. Every modern shower needs a full waterproofing system applied behind the tile.

Three systems dominate. Schluter Kerdi is a polyethylene membrane laminated to felt fleece that bonds to substrate with unmodified thinset. Wedi is foam panel construction that’s already waterproof — you tile directly on it. Laticrete Hydro Ban is a paint-on liquid membrane that builds up to a continuous waterproof layer. All three work when installed correctly. The failures come from shortcuts — incomplete corner banding, missed pipe penetrations, or skipping waterproofing entirely on “the wall opposite the shower head where water doesn’t hit.”

Insist on photos of the waterproofing layer before tile goes up. Any contractor who resists supplying them is hiding something.

Tile Selection That Survives

Floor tile in a shower needs a DCOF (dynamic coefficient of friction) of 0.42 or higher per ANSI A326.3 to meet residential wet-area code. Most porcelain wood-look planks meet this; many polished marbles don’t. For shower floors specifically, mosaic tile in 1 to 3-inch sizes is the easiest path — the grout-to-tile ratio gives mechanical grip even when DCOF is borderline.

Wall tile faces fewer requirements but matters aesthetically. Large-format porcelain (24 by 48 inches up to 32 by 96 inches) creates dramatic showers with minimal grout maintenance but requires medium-bed mortar and an experienced setter. Standard 12 by 24 subway and basket-weave looks remain the most timeless option and the easiest to install.

Pricing tiers run $2 to $5 per square foot for entry-level porcelain, $6 to $12 for designer porcelain and standard marble, $15 to $35 for high-end natural stone and decorative mosaics, and $40-plus for exotic stone slabs cut to size.

The Shower Valve and Plumbing Behind the Wall

Buy quality at the valve. Inside-the-wall components are nearly impossible to service once tile is set, and cheap valves leak or scale within 5 to 8 years. Moen U series, Delta MultiChoice Universal, Kohler Rite-Temp, and Grohe SmartControl all use widely-available parts and have been in production for decades. Pressure-balancing valves are required by code in most jurisdictions; thermostatic valves cost more but maintain water temperature when other fixtures are flushed.

For a spa-style shower with multiple shower heads, plan supply line sizing carefully. A standard 1/2-inch supply line delivers about 7 GPM at 50 PSI. Add a rain head plus body sprays and demand can exceed 12 GPM, requiring 3/4-inch supply lines back to the manifold and possibly a tankless water heater capable of 8-plus GPM at the temperature rise your climate demands.

Glass Enclosures and Doors

Frameless glass enclosures look luxurious and run $1,500 to $4,500 for a typical 60-inch shower. The 3/8-inch tempered glass is the visual standard; 1/2-inch is overkill for most residential applications. Semi-frameless designs at $800 to $1,800 use a slim metal frame on the wall side and frameless edges elsewhere — close to the frameless look at significant savings.

Sliding bypass doors fit alcove tubs and tub-shower combos where there isn’t room for a hinged door’s swing. Pivot and hinge doors need 22 to 28 inches of clear swing radius and work in standalone shower stalls.

Where Budgets Blow Up

• Subfloor rot: Discovered after demo. Adds $800 to $3,500 to replace joists and decking
• Galvanized supply pipe: In any home over 35 years old, plan on $1,200 to $3,500 to replace with PEX or copper
• Electrical that doesn’t meet code: GFCI requirements, AFCI requirements, and dedicated circuit needs for heated floors and lighting add $400 to $1,800
• Asbestos in old vinyl flooring or pipe insulation: Abatement adds $1,500 to $5,000 and 1 to 3 days of work
• Permits and inspections: Often forgotten in initial budgets. Plan for $300 to $1,200 depending on jurisdiction

Timeline Reality Check

A tub-to-shower conversion runs 7 to 14 calendar days under a single contractor with no surprises. Full bathroom gut runs 3 to 6 weeks. Multi-trade coordination is the main delay driver — the plumber needs to leave before the tile setter starts, the tile needs to cure before grout, grout needs to cure before glass measurement, and glass takes 7 to 10 days to fabricate after measurement. Plan the project before you start and confirm trade availability for the back-end work before demo begins.

ROI and Resale Considerations

Bathroom remodels recoup 60 to 75 percent of cost at resale on average, with tub-to-shower conversions on the higher end of that range in homes that already have a tub elsewhere. Houses with only one tub should keep at least one bathtub somewhere — buyers with young children rule out homes with zero tubs. Walk-in showers add value in master suites; alcove tubs maintain value in hall baths.

Bottom Line

Pick the tier honestly based on the scope you can afford including 20 percent contingency. Hire a single contractor accountable for all trades, not multiple sub-contractors you coordinate yourself. Verify waterproofing with photos before tile. Spend on plumbing valve quality and tile durability where you’ll never get a second chance to upgrade. Do that and a shower bath remodel becomes a 15-year improvement instead of a 5-year regret.