Luxury Bathrooms · Specification
The specification, quietly detailed
A short, opinionated spec sheet for a premium residential bathroom — dimensions, materials, lighting, and the exact place a hydrogen bath appliance belongs.
Dimensions and geometry
- 01
Room area
8–15 sq m. Below eight, the ritual feels compressed. Above twenty, intimacy is lost. Twelve is often the quiet sweet spot.
- 02
Ceiling height
2.8–3.2 m. Taller than a corridor, not institutional. The room's calm is partly a function of this ratio.
- 03
Tub
Freestanding. Inside length 1600–1750 mm. Depth 450–500 mm. Long side facing the room's most beautiful surface. 400 mm of empty space on every side.
- 04
Vanity
One or two basins on a solid stone slab. Recessed storage below. Fittings wall-mounted, not deck-mounted, to keep the slab clean.
- 05
Storage
Recessed into a full-height cabinet. Never floor-mounted. Ideally not visible from the tub.
Materials and finishes
The short list, in order of frequency
Honed limestone or oiled oak
Both read warmer than tile. Both are forgiving in wet-room conditions when detailed correctly.
Micro-cement or honed stone
One long stretch of an uninterrupted surface behind the tub. The wall becomes the room's inhale.
Brushed brass or patinated bronze
Used sparingly, on wall-mounted fittings only. Nothing electroplated.
“Every specification decision is quietly a decision about the ritual the room will hold.”
Lighting
The two-circuit rule
- 01
Perimeter circuit
Wall washes, sconces and a low pendant. Warm 2400–2700K. CRI ≥ 90. On a dedicated dimmer.
- 02
Function circuit
One or two carefully placed downlights, kept away from the tub, for cleaning and evening use. Warm 2700K. On a separate dimmer.
- 03
Never above the tub
No downlight, ever, directly over the bath. The room's whole atmosphere is lost the moment cold light hits the water.
The appliance in the spec
Bath One™, as furniture
In the specification we hand to architects, Bath One™ is treated as a permanent piece of small furniture at the side of the tub. A low plinth at 350mm high, in the same stone as the wall or the floor, with a dedicated 10A power point recessed into its rear face. The plinth is included in the joinery drawings, not the plumbing ones.
This is not because the appliance needs to be featured — it doesn't — but because a permanent home for it is what quietly holds the ritual in place across years of use.
Engineering & specification
The engineering brief lives on HydrogenMachines.com.au
Cell architecture, hydrogen output, certifications, service intervals and commercial specifications are documented in full on our sister site — written for architects, spas and buyers who want the technical depth.
Visit HydrogenMachines.com.au →Questions
Considered answers
- What tub size is best?
- Inside length between 1600 and 1750mm. Long enough to submerge; short enough to hold heat. Deeper tubs (450–500mm depth) are quietly preferred over wider ones.
- Which stone is easiest to live with?
- Honed limestone or unfilled travertine. Warmer under bare feet than marble, more forgiving of water spots, and softer under low light.
- Where does the Bath One™ appliance sit in the spec?
- As a fixed object at the side of the tub, on a low plinth, with a dedicated 10A power point. Treated in the specification as a permanent piece of furniture.
The Pillar
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