BATHROOM & EN-SUITE SAUNAS

Bathroom & En-suite Saunas — A Full Sauna in a Small Space

Some of the best saunas we have built in London sit in rooms most people would write off: a spare WC, the end of an en-suite, a cupboard under the stairs, the dead corner of a family bathroom. A properly designed compact sauna needs far less floor area than people expect — a single-person sauna can work in around a metre square, and a couples sauna in a little more. Built on-site to the millimetre and finished to match your bathroom, our bathroom and en-suite saunas start from £9,995 fully installed.

Why a bathroom is a natural home for a sauna

The sauna ritual is heat, then cool down, then rest. In a bathroom the shower is already a step away, the floor is already waterproof and the room is already designed to handle moisture. That makes the en-suite one of the most practical places in a house for a daily sauna — you use it because it is right there, not because you have to walk to the bottom of the garden in January.

Keeping the sauna and the wet room apart

A Finnish sauna is a dry, timber room that gets brief bursts of humidity from löyly; a shower is a wet zone. We keep them separate: the sauna sits on its own insulated, vapour-sealed shell with the bench timber clear of the floor, a toughened glass front or door seals it from the shower area, and every electrical component is placed and rated for its zone. Your tiling and waterproofing stay untouched behind the sauna build.

Ventilation and heat in a small room

Compact saunas fail when they are treated as a box with a heater in it. A small cabin needs the same planned air path as a large one — fresh air in low near the heater, out high on the far side — and the extract has to work with the bathroom fan rather than against it. We size the heater precisely to the cabin volume, allowing for any glass, and often use bench-integrated or slimline wall heaters so the space goes to you, not the equipment.

Finnish, infrared or hybrid?

Traditional Finnish saunas give the deepest heat and real löyly. Infrared suits the very smallest spaces and lower temperatures. Hybrid saunas combine a compact heater with ceiling infrared panels for quick warm-up and flexibility. We will recommend the one that works best for your room size, electrics and how you like to bathe.

Compact saunas we have built

WC converted to a sauna – Notting Hill, London. Under-stairs sauna – Clapham, London. Thames-view sauna in a flat – Wapping, London. See all our sauna case studies.

Bathroom & En-suite Sauna FAQ's

Can you put a sauna in a bathroom or en-suite?

Yes. We build saunas into bathrooms and en-suites regularly. The sauna is constructed as its own insulated, vapour-sealed cabin with a glass front, kept separate from the shower zone, with ventilation designed to work alongside the bathroom extract.

How small can a home sauna be?

A single-person sauna can work in around 1.0m × 1.0m, and a couples sauna from about 1.2m × 1.2m. Ceiling height and the position of the door matter as much as floor area, so we always check photos and dimensions first.

How much does a bathroom or en-suite sauna cost?

Compact bathroom and en-suite saunas start from £9,995 fully installed for a single-person sauna and £10,995 for a couples sauna. Glass fronts, premium timbers and hybrid heaters add to the cost; we give a fixed quote after reviewing your space.

Will a sauna damage my bathroom?

No. The sauna has its own vapour barrier and insulation, so heat and moisture stay inside the cabin, and the bathroom's tiling and waterproofing are left intact. The ventilation removes moist air to outside.

What electrical supply does a compact sauna need?

Most compact saunas run on a dedicated circuit from the consumer unit. Installation must comply with BS 7671, including its bathroom zones and its section on sauna installations, and a new circuit is notifiable to building control under Part P of the Building Regulations. We coordinate the certification with your electrician or ours.

Bathroom & En-suite Sauna Prices

*Prices include:

• FF-PIR Sauna Insulation
• Sauna Vapour Barrier & Joining Tape
• ALDER / ASPEN Sauna Wall Panelling with Discrete Mounting Clips
• ALDER / ASPEN Sauna Bench Timber
• One or Two Sauna Headrests (depending on sauna size)
• Ceramic Sauna Light with Frost Diffuser
• Standard Sauna Door with Wooden Door Knob (specify left or right opening)
• Wall Mounted or Free Standing Sauna Heater with Built in Controls
• Sauna Thermo-Hygrometer

**Installation excludes preparation work or builders work (to be done by others based on our drawings)

***ALL PRICES EXCLUDE VAT