Bathtubs

Bathtubs are an architectural product. The cost of buying one is dwarfed by the cost of fitting one into an existing bathroom — and the cost of fitting one is dominated by the install location, the framing requirements, and the drain plumbing. This page is structured around the install reality first, then the material and form factor decisions.

The four install types

What determines almost everything else about your purchase:

Alcove tub (the US standard)

Three sides enclosed by walls (typically tile surrounded), one side exposed (the apron). 60-inch length is the de-facto US standard. The cheapest, easiest, and most common install. About 80% of US residential tubs are alcove.

Price: $200–$1,200 for the tub itself. Install: $400–$1,200 (no major framing changes if replacing an existing alcove).

Drop-in tub

Tub sits inside a built-in surround (deck) that you (or the builder) construct. Looks like a freestanding tub but is supported by the surround structure. Common in primary bathrooms where the homeowner wants more space than alcove allows.

Price: $400–$2,500 for the tub. Install: $1,500–$5,000 because the surround framing and tile work is bespoke.

Freestanding tub

Sits on the floor as a standalone sculptural object. Claw-foot, slipper, oval, rectangular. Trending strongly in primary-bath remodels since 2018.

Price: $700–$8,000+ for the tub. Install: $800–$2,200 in plumbing because the drain and supply lines come up through the floor in the middle of the room rather than from a wall.

Walk-in tub

Sealed door allows the user to walk in rather than step over the rim. Aging-in-place product. Slow to fill and drain because the door must be closed before water can be added and opened before exiting.

Price: $2,500–$10,000. Install: $1,500–$4,000 because of the larger drain demands.

Material decisions

The material affects weight, heat retention, durability, repairability, and price.

Acrylic (the modern default)

Reinforced acrylic sheet over a fiberglass backing. Lightweight (50–80 lb), warm to the touch, retains heat reasonably well. Most common modern material — covers 70% of new residential tubs.

Pros: light enough for upper-floor installs, available in every shape and color, repairable with patch kits, warm to bare skin.

Cons: scratches more easily than enamel, can dull over time with abrasive cleaners.

Lifespan: 10–20 years depending on care.

Enameled steel

Steel base with porcelain enamel coating fused at high temperature. Common in older homes (1940s–1970s installs). Still available as a budget new-construction option.

Pros: durable enamel surface resists scratching, classic look, low cost ($150–$400).

Cons: heavy (60–100 lb), cold to the touch, enamel can chip if hit with a heavy object, exposing rust-prone steel underneath.

Lifespan: 25–40 years on the enamel if not chipped.

Cast iron

Solid cast iron coated with porcelain enamel. The premium traditional material.

Pros: extraordinary heat retention (water stays warm 30% longer than acrylic), nearly indestructible, classic look, premium feel.

Cons: extremely heavy (250–400 lb empty, 600+ lb full). Often requires floor reinforcement. Cold to the initial touch (warm-up is slow). $700–$3,500.

Lifespan: 50+ years routinely. Cast iron tubs from the 1920s are still in service.

Stone resin / solid surface

Cast composite of stone particles and resin binder. Trending in freestanding installs.

Pros: matte stone-like finish, excellent heat retention, sculptural appearance, durable.

Cons: heavy (150–300 lb), expensive ($1,500–$6,000), can stain if not sealed properly.

Lifespan: 25+ years.

Copper / brass

Sculptural premium freestanding tubs. Almost exclusively a design statement; the patina changes over time.

Price: $4,000–$15,000.

Maintenance includes oxidation control unless living patina is the goal.

Standard dimensions and why they matter

Most adults are surprisingly tall in a bathtub. A 60-inch alcove tub gives an average-height adult 50 inches of internal length — comfortable for sitting upright, tight for full-body soaking. A 5'10" adult genuinely needs 65–67 inches of internal length to lie flat.

Typical sizes:

• 60" × 30" alcove: the US standard. Compatible with most existing bathroom layouts.
• 60" × 32" or 60" × 36": deeper bathing experience, requires wider alcove framing.
• 66" × 32": mid-size freestanding. Comfortable for tall adults.
• 72" × 36": larger freestanding. Two-person capable but uses substantial floor space and 50+ gallons per fill.
• Japanese soaking tubs (ofuro): shorter but deeper (typically 27–30" deep). Encourages upright seating with full-shoulder submersion. Niche in US market but growing.

Brand landscape

• Kohler: the breadth leader. Underscore alcove ($800) is a popular mid-market choice. Tea-For-Two soaking tubs and Vintage cast iron are recognizable premium options.
• American Standard: value-oriented. Princeton series at $300–$500 for alcoves; reliable basic builds.
• Sterling (Kohler-owned, value brand): $200–$500 alcoves. Common in builder-grade installs.
• MAAX: Canadian-made acrylic specialist. Above-average build quality for the price.
• Mansfield: US-made traditional enameled steel. Budget tier ($250–$500).
• Signature Hardware: freestanding-focused retailer. Aelius, Tubby, Ackley series are popular cast-iron and stone-resin freestanding pieces. $1,500–$4,500.
• Cheviot: cast-iron freestanding specialist. Premium pricing ($2,000–$6,000) for traditional clawfoot designs.
• Wyndham Collection / Vanity Art: import freestanding brands. Wide selection at moderate price ($800–$2,500), some quality variance from unit to unit.
• Bain Ultra / Aquatica: specialty premium air-jet and Japanese-style soaking tubs. $3,000–$15,000.

Install considerations buyers underestimate

• Floor loading. A 250-lb cast iron tub holds 60 gallons of water (500 lb) plus a person (150–200 lb) — about 950 lb concentrated in a small footprint. Most floor framing handles this, but second-floor installs over cantilevered framing or wide-spaced joists may need reinforcement.
• Door clearance. A freestanding tub may be deliverable into your bathroom only by removing a door, sometimes by removing a wall. Measure the path before ordering. A 60×30 acrylic alcove fits through every doorway; a 72×36 freestanding cast-iron rarely does.
• Drain location. Replacing an alcove with another alcove keeps the drain where it is — minimal plumbing change. Replacing alcove with freestanding requires moving the drain inboard, which means floor framing work and substantial plumbing. Budget $800–$2,000 for the drain relocation.
• Faucet location. Freestanding tubs typically use a floor-mount or wall-mount faucet positioned at one end. The faucet drilling alone can be a $400–$800 plumbing job if done correctly with shut-off valves and proper rough-in.
• Filling time. A 60-gallon freestanding tub from a standard 2.2 GPM faucet takes 27 minutes to fill. Premium tub fillers (5–8 GPM) cut this to 10–15 minutes. Most US home water heaters cannot deliver 60 gallons of hot water without cycling — the bottom third of the bath may be lukewarm. This is the silent disappointment behind many large-tub purchases.

The hot-water budget question

A standard 50-gallon water heater holds 50 gallons of hot water. Filling a 60-gallon tub with 105°F bathwater requires roughly 35 gallons of hot water (mixed with 25 gallons of cold). That uses 70% of the heater's reservoir — fine.

A 72-inch freestanding tub holds 80–90 gallons. Filling it requires 50–55 gallons of hot water — more than the 50-gallon heater holds. The tub will start hot and finish lukewarm.

For households planning large soaking tubs, the right answers are: a larger water heater (75–80 gal), a tankless heater (delivers continuously), or accepting that the tub is a luxury rarely used to capacity.

Decision shortcut

If your bathroom has an existing alcove and you are replacing the tub: stay with alcove. The math on switching to freestanding is rarely worth it given the plumbing rework.

If you are doing a primary-bath remodel and have the floor space: freestanding cast iron or stone resin is the install that holds value at resale and feels like a real upgrade daily.

If you are aging in place or planning for a parent: walk-in tub is the right product, despite the install cost.

If you are renovating a guest bath, vacation home, or rental: budget alcove acrylic ($300–$500) hits the right balance of cost and visible quality.