London’s leading bespoke sauna buildersHome saunas custom designed & installed
Saunas designed from the heat up and built by hand to your exact space – correct kiuas sizing, engineered ventilation and soft, even löyly.
Fully installed saunas from £9,995
We don’t sell sauna kits. We build saunas that actually work.
The Sauna Company designs and builds bespoke saunas across London and Surrey not from a catalogue, but from the ground up, fitted precisely to your space. Every project starts with the part most installers skip: the ventilation and heat engineering.
In 15+ years and 100+ bespoke installations across London and Surrey, we’ve never fitted the same sauna twice, because no two spaces or clients are the same. If you want it done properly, from the ventilation up, you’ve found the right builders.
Heat
Kiuas correctly sized to room volume, glass and stone mass.
Air
Engineered intake and exhaust – no stale, CO₂-heavy air.
Löyly
Stone bed and vent geometry tuned for soft, enveloping steam.
Timber
Thermo-aspen, cedar and alder chosen for how they behave at 90°C.
From a single room to a private wellness suite.
Send us photos and the dimensions of your space and we will come back with an honest assessment of what will work.
Bespoke New Sauna Design & Build
We build saunas the way they’re supposed to be built — designed around the room, the heat, and the person seated in it. Indoor conversions, basements, lofts and full spa builds.
Design & build
NEW FOR 2026Outdoor Saunas & Cold Plunge
Garden cabins, wood-fired saunas and complete hot–cold sanctuaries with cold plunge pools and ice baths.
Explore outdoor
Existing Sauna Upgrade & Renovation
Rotted timber replaced, heaters resized, ventilation corrected, controls upgraded and stone beds rebuilt – for homes, gyms, hotels and spas.
Upgrade a saunaEvery space presents a different challenge.
A disused WC in Notting Hill. A garden shed in Hammersmith. A basement gym in Virginia Water. A loft conversion in Golders Green. We’ve built saunas in corners that architects said couldn’t be done — and delivered the favourite room in the house.
Twelve ways to build a sauna.
Guide prices are for a fully designed and installed sauna, excluding VAT and builders’ preparatory work. Every project is quoted individually after we have seen your space.
Sauna prices in detailMost saunas fail before they’re even built.
Not because of the timber. Not because of the heater. Because the person who designed them didn’t understand ventilation. A sauna that isn’t properly ventilated fills with CO₂, the heat becomes stifling, sessions get cut short — until it becomes expensive storage.
We start where most installers stop: with the air. We calculate air volumes, model heat distribution and design a ventilation system that keeps your sauna performing at its best, every session — then build it on site, to your exact space, with the finest Scandinavian timbers and premium HUUM and Harvia equipment.
The science of a good sauna
Four steps to your sauna.
- 01
Send photos & sizes
Share pictures and dimensions of the space, and how you want to use the sauna.
- 02
Design & heat engineering
Layout, timber, heater and ventilation specified for your room and your ritual, with drawings and 3D visuals.
- 03
Built by hand on site
Our own craftsmen fit every board to your exact space – no flat-pack kits.
- 04
Commissioning & aftercare
We tune the löyly, set up controls and stay on hand for servicing.
Ready to design your sauna?
Tell us about your space and attach a few photos with rough dimensions. We will reply with ideas, a guide price and the next steps.