Freestanding Baths: Acrylic, Cast Iron, or Composite?

A freestanding bath transforms a bathroom from functional to luxurious. But with prices ranging from £300 to £10,000+, understanding the material differences is essential before you invest.

Acrylic Freestanding Baths

Acrylic is the most common and affordable material for freestanding baths. A sheet of acrylic is thermoformed into shape and reinforced with fibreglass on the underside.

• Pros: Lightweight (easy to install, even upstairs), warm to touch, available in many shapes, affordable (from £300), repairable if scratched
• Cons: Can flex slightly underfoot, less heat retention than other materials, may discolour over time with certain cleaning products, lower-end models can feel plasticky
• Price range: £300 – £1,500
• Weight: 25 – 40kg (empty)

Best for: Budget-conscious renovations, upper-floor bathrooms where weight is a concern, and when you want design variety.

Cast Iron Freestanding Baths

The original freestanding bath material. Molten iron is poured into a mould, then coated with porcelain enamel. Cast iron baths have been made the same way for over 150 years.

• Pros: Exceptional heat retention (keeps bathwater warm for much longer), incredibly durable (can last generations), porcelain enamel is extremely hard-wearing, traditional aesthetic is authentic
• Cons: Very heavy (80-150kg empty — floor must support the weight), expensive, limited shapes (mainly roll-top and slipper), cold to touch initially, requires careful installation
• Price range: £800 – £5,000+
• Weight: 80 – 150kg (empty)

Best for: Traditional and period-style bathrooms, ground-floor installations, and homeowners who want a bath that lasts a lifetime.

Composite (Solid Surface) Freestanding Baths

Composite baths are made from engineered materials — typically a blend of natural minerals, resins, and pigments. Brands include Clearwater, BC Designs (Cian range), and Lusso Stone. The material can be moulded into organic, contemporary shapes impossible with cast iron.

• Pros: Excellent heat retention (better than acrylic, comparable to cast iron), warm to touch, available in matt and silk finishes, organic contemporary shapes, repairable
• Cons: Heavy (50-100kg), more expensive than acrylic, requires careful cleaning (no abrasive products), some composites can stain if not maintained
• Price range: £1,000 – £4,000
• Weight: 50 – 100kg (empty)

Best for: Contemporary luxury bathrooms where you want the thermal performance of cast iron in a modern shape.

Practical Considerations

Floor Strength

A cast iron bath full of water with a person in it can weigh 350-450kg. In Victorian houses, ground-floor joists typically handle this fine, but upper floors may need assessment. Acrylic and lightweight composite baths rarely pose structural concerns.

Plumbing

Freestanding baths require waste and water connections routed through the floor or wall behind the bath. Plan the pipework early — retrofitting concealed plumbing is difficult once the floor is tiled.

Size

A freestanding bath needs space around it to breathe — at least 100mm clearance on all open sides, ideally more. In a room under 2.5m wide, a built-in bath may work better.

Our Verdict

For most London renovations, we recommend composite for contemporary bathrooms and cast iron for traditional ones. Acrylic is the sensible budget option, and good-quality acrylic baths (Clearwater, Roper Rhodes) look and perform well above their price point.

Thinking about a freestanding bath? Get in touch and we'll help you choose the right one for your space and budget.

Frequently Asked Questions

Can my floor support a cast iron bath?

Ground floors and solid concrete floors are usually fine. Suspended timber floors (common in Victorian and Edwardian houses) should be assessed by a structural engineer or experienced builder before installing a heavy bath.

Do freestanding baths need a special waste?

Most freestanding baths use a standard 40mm waste. The key consideration is routing the waste pipe through the floor — plan this before tiling.

Can I have a shower over a freestanding bath?

Yes, using a freestanding bath/shower mixer with a handset. However, there's no shower screen, so water can splash onto the floor. A ceiling-mounted shower rail with curtain is one solution.

How do I choose between a single-ended and double-ended freestanding bath?

Single-ended (sloped at one end) is best for solo bathing — you lean against the slope comfortably. Double-ended (symmetrical) suits two bathers or a more formal look.

2026 Update

Reviewed for 2026. Fixture ranges and finishes move quickly, so use this as a guide and check current availability before you buy. Need help choosing for your bathroom? Get tailored advice and a fixed-price quote.