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How it's built

European-engineered.
Built on two continents.

The cabin is built at one of our production lines across Europe and the United States. The specification is identical at each. Orders route to whichever line minimises freight and lead time to the install address — never reverse.

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Europe · United States

The NOOK Outdoor Sauna at dusk — black thermo-treated cladding, panoramic glass lit from within

The wellnessbyNOOK production posture

Production

Where the cabin is built.

Each base is sized for the routes it serves. Specification, materials, tolerances, and electrical certification are identical at all three.

  • Europe Multiple lines

    Build slot
    4 weeks
    Routes
    Europe · UK

  • United States One line

    Build slot
    5 weeks
    Routes
    North America
Materials provenance

Every material comes with a chain-of-custody certificate.

Interior cladding
Canadian hemlock PEFC chain-of-custody certified. Sourced from British Columbia, kiln-dried at the production base, milled to 21 mm T&G on site.
Exterior cladding
Thermo-treated wood Heat-treated to ThermoWood-D class at 190°C. Treatment and finishing happen at the order’s assigned production base.
Insulation
Rock-wool, 80 mm Rockwool brand. λ 0.034 W/mK. Energy Rating A, officially verified.
Roof membrane
EPDM single-ply rubber Carlisle SynTec EPDM. 50-year manufacturer warranty.
Steel structural frame
Reinforced cold-rolled steel European-spec galvanised steel. Fabricated to the structural specification in the dossier.
Glazing
Tempered safety glass EN 12150 certified. Panoramic + sliding door. Toughened to 4× standard glass strength.
Hardware
Stainless steel 304-grade Marine-grade 316 for any coastal-exposure install (within 5 km of saltwater).
Heater
HUUM Drop 6 kW Estonian-engineered by a three-generation stove-making family. JSON API via HUUM UKU. Olivine stones (~30–35 kg).
Foundation
Helical-pile steel screw Six Ø 76 mm piles, 1.5–2.5 m embedment. Reversible — unscrews without leaving concrete behind.
Materials, asymmetric

Three materials carry the cabin.

Every material chosen for thirty-year heat-cycle survival. Every supply chain documented before the cabin leaves the production base.

Macro of the Canadian hemlock tongue-and-groove seam, warm light across the closed grain
PEFC certified

Canadian hemlock

Interior cladding. Closed-grain, low-resin, cool to the touch at 100°C. Industry benchmark.
Extreme macro of the black thermo-treated timber texture with a single water droplet
ThermoWood-D

Thermo-treated wood

28 mm shiplap, ThermoWood-D class. 30-year outdoor service life.
Macro of olivine stones stacked in the heater’s steel cage, faint steam rising
EN 60335-2-53

HUUM Drop 6 kW + olivine

Estonian-engineered heater. ~30–35 kg olivine stone load. JSON API via HUUM UKU.
Macro of the black EPDM roof membrane meeting the drip edge, rain beading on the surface
50-year warranty

EPDM membrane + steel frame

Carlisle SynTec EPDM with a 50-year warranty. Reinforced steel structural frame — full structural documentation in the dossier.
HUUM Drop 6 kW heater with olivine stones, mounted against Canadian hemlock cladding inside the NOOK Outdoor Sauna
HUUM Drop 6 kW — Estonian-engineered, JSON API via HUUM UKU, ~30–35 kg olivine stone load. Bench-tested at the production base before crating. NOOK Prefab, 2026
What is deliberately not in the cabin

The materials we will not specify, at any price.

MDF
Never. Off-gases formaldehyde at heat.
PVC
Never. Off-gases at heat.
Particle board
Never. Cannot survive the heat-humidity cycle.
Plywood
Never. Inferior to solid timber for sauna interiors.
Generic plastic moldings
Never. Stainless steel hardware throughout.
Next step

Read the full specification. Or walk a property with our team.

Drawings, materials provenance, install case studies, and ROI math in a single PDF. Inside one business day.

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Hospitality operators, private estates, and architecture studios.