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How it's built

European-engineered.
Built across three bases.

The cabin is built at one of three production bases. The specification is identical at each. Orders route to whichever base minimises freight and lead time to the install address — never reverse.

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Valencia · Black Forest · Sarasota

The wellnessbyNOOK production posture

Three production bases

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.

  • Valencia Spain

    Lead time
    4 weeks
    Routes
    Iberia · France

  • Black Forest Germany

    Lead time
    4 weeks
    Routes
    DACH · Benelux

  • Sarasota Florida

    Lead time
    5 weeks
    Routes
    US East Coast
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
Thermowood pine Heat-treated to ThermoWood-D class at 190°C. Spruce sourced from Northern Europe; treatment at the Black Forest base, finishing at the order's assigned 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 ISO 17654 (sauna structural).
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.

Canadian hemlock cladding inside the NOOK Outdoor Sauna — 21 mm tongue-and-groove
PEFC certified

Canadian hemlock

Interior cladding. Closed-grain, low-resin, cool to the touch at 100°C. Industry benchmark.
Thermowood pine exterior cladding on the NOOK Outdoor Sauna
ThermoWood-D

Thermowood pine

28 mm shiplap, ThermoWood-D class. 30-year outdoor service life.
HUUM Drop 6 kW heater with olivine stones
EN 60335-2-53

HUUM Drop 6 kW + olivine

Estonian-engineered heater. ~30–35 kg olivine stone load. JSON API via HUUM UKU.
Detail of cabin interior showing benching against cladding
50-year warranty

EPDM membrane + steel frame

Carlisle SynTec EPDM with a 50-year warranty. Reinforced steel structural frame to ISO 17654.
HUUM Drop 6 kW heater with olivine stones, mounted against thermowood 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.

Read the specification Talk to our team

Hospitality operators, private estates, and architecture studios.