Walk In Tub vs Roll In Shower: Walk-In Baths and Level-Access Wet Rooms Compared (UK)

Most people reach this decision after a fall, a hospital discharge letter or a visit from an occupational therapist — so it gets made in a fortnight, from a brochure, under pressure. That is how a household spends £5,000 on a bathroom no safer than the one it replaced.

A note on words, because the quotes landing in your inbox will not agree. A walk-in tub is sold here as a walk-in bath; a roll-in shower is a level-access shower, or a wet room once the floor is tanked and falls to a drain.

Before comparing prices, work out which problem you actually have. Answer these six about the person who will use the room daily, not the household.

• •Can they step over a 150mm threshold unaided on a wet floor? A walk-in bath still has a 100–170mm door step, and borderline now means impossible later.
• •Can they lower onto a 430–480mm seat and stand up again with wet hands? Failing sit-to-stand is the commonest reason walk-in baths stop being used.
• •Do they use a wheelchair, rollator or transfer board, or is that likely within five years? Only level access takes wheeled equipment; a bath cannot be adapted later.
• •Will a carer assist? A wet room gives a helper 700–900mm beside the user; a walk-in bath puts a 600mm wall between them.
• •Has a physiotherapist recommended warm-water immersion for arthritis or chronic pain? That is a real argument for the bath. Habit is not.
• •How do they cope with being wet and cold for 8–12 minutes? That is the fill-and-drain window in a walk-in bath.

Two discouraging answers in the first four and the decision is made for you. These are the figures we specify to; our guide to making a bathroom accessible covers the rails and door widths around either.

• •Threshold: walk-in bath 100–170mm; level-access shower 0–15mm, or 25–45mm with a low-profile tray and ramped edge.
• •Water per use: 170–230 litres to fill a walk-in bath above seat level; 60–90 litres for an eight-minute shower.
• •Time in the room: 22–35 minutes for a bath once filling and draining are counted; 10–15 for a shower.
• •Footprint: a walk-in bath drops into a standard 1700 × 700mm bath space. A shower a carer or chair can use wants 1200 × 900mm clear.
• •Adaptability: a wet room takes a perching stool today and a mobile shower chair later. A walk-in bath is a fixed answer to a changing question.
• •Resale: buyers read a wet room as a modern bathroom, a walk-in bath as a medical fixture.

Hot water is where walk-in baths quietly fail. A 24kW combi giving 12 litres a minute takes 15–19 minutes to put 200 litres in the bath, and in January it will not hold 40°C at that flow. A 210-litre unvented cylinder is emptied by one bath, leaving the next person waiting 60–90 minutes. Test the flow rate with a bucket and stopwatch before anyone measures up.

Showers are kinder to UK plumbing, and the controls matter more than the tray. Fit a TMV2 thermostatic mixer at 41°C with a lever handle, 900–1000mm up at the dry end, and a riser rail so a seated user can drop the head. Electric instead? An 8.5kW unit is feeble in winter; 9.5–10.5kW on its own Part P–certified circuit.

On a ground-floor slab, level access is straightforward: a former bedded into a chased recess, a tanking membrane, falls of roughly 1:50 to a gulley. Two days, no structural argument.

First-floor timber is the cost driver and the reason quotes diverge. Victorian and inter-war joists run 175–220mm deep; a recessed former plus trapped gulley wants 90–120mm of that, and notching rules cap you at an eighth of the joist depth. That leaves trimming between joists with a shallow-trap gulley, a 40–60mm platform with a 1:20 ramp, or a 25mm tray with a bonded threshold ramp. Add £600–£1,500 upstairs; our shower installation cost guide breaks the labour down.

A walk-in bath fits faster, into the existing footprint, but bath, water and occupant total 300–330kg over about 1.2m² — fine on sound joists, not on a floor that bounces. Either way the extractor must shift 15 litres a second, or you will be fighting bathroom mould within two winters.

Walk-in baths run £1,700–£4,500 supply-only and £3,500–£7,000 fitted; powered doors and air-spa systems push £6,000–£10,000 and rarely earn it. Level access starts lower than people expect — a low-profile tray, half-height screen and welded safety vinyl is £2,500–£4,500 fitted; a fully tanked, retiled wet room is £6,000–£12,000.

Running costs favour the shower without settling it. On a meter, a filled walk-in bath costs £1.10–£1.40 in water, sewerage and gas: four a week is £230–£290 a year against £165–£220 for a daily shower. Ten years, roughly £700 apart.

Two things move the number far more. The Disabled Facilities Grant covers up to £30,000 in England, £36,000 in Wales and £25,000 in Northern Ireland, with Scotland run through the Scheme of Assistance. Get the council occupational therapist's assessment before ordering anything, because buying first can disqualify the work. Then VAT: adaptations for a chronically sick or disabled person are zero-rated on goods and labour with a signed eligibility declaration — £1,200 off a £6,000 job. Raise it with the usual questions to ask a contractor.

On a walk-in bath it is always the door seal: 5–10 years, then £120–£300 for a gasket, assuming the manufacturer still trades — not a safe assumption here. In hard-water areas dry the sealing face after every bath, because limescale turns a weep into a floor repair.

On a wet room, silicone at the screen-to-floor junction needs renewing every three to five years at £60–£150, and the gulley trap wants clearing monthly. The failure that hurts is the tanking membrane, usually at the gulley flange or where a fitter skipped the upstand behind the former — £1,500–£3,500 to redo, plus the ceiling below. Get the tanking guaranteed in writing, separately from the tiling.

Flooring does quiet work here. Welded safety vinyl with a wet pendulum value of 36 or above, coved 100mm up the wall, is the care-sector specification, and it copes with wet dog paws too — see our bathroom flooring picks. Tiles instead? R11 or better, small format.

For roughly eight in ten UK households facing this, the level-access shower is the better buy: cheaper at the lower specification, workable with carers and wheelchairs, adaptable as needs change, and still a bathroom rather than a piece of equipment. The walk-in bath earns a narrow but real case — reliable sit-to-stand, no wheelchair on the horizon, a clinical reason to soak, and someone who will not use a shower.

Can you have both? In a typical 2.4 × 1.8m bathroom, not well. Fit it yourself? Setting a former on a slab suits a confident DIYer, but the waste, the guarantee and the electrics do not, and a self-installed wet room rarely satisfies a grant inspection. Do it before other work: bathrooms top most ageing-in-place modification lists because falls happen there first.