A different way of building
Most saunas are built in layers: a timber lining fixed to a frame, insulation behind it and cladding outside. Done carefully, it's a durable method and one Heritage uses often, because it lets a sauna match the house it sits beside.
Solid timber takes a different approach, and it's the other method Heritage Saunas builds with. The walls are solid interlocking timber that forms both the interior and the exterior. The result is a building in its own right.
Which method suits depends on the site, the house and how the sauna will be used. This piece looks at the solid timber build in detail.
Layers and solid walls
In a layered wall, each material does one job. The frame carries the load, the insulation holds the heat and the cladding keeps the weather out. With good materials and careful detailing, that wall lasts for decades.
A solid timber wall does all of those jobs at once. What you see from inside is what holds the building up, so the joinery is on show in every corner.
The integrity of solid timber
Log construction relies on the strength of the timber itself. Each wall is made of interlocking Redwood logs, cut with dovetail joins that lock corners seamlessly. The wall is both inside and outside, unlined, unhidden, and uncompromised.
The benefits are immediate. Solid timber provides natural insulation, retaining heat without the need for synthetic layers. The mass of the logs creates stability, settling over time into a structure that strengthens with age. Every cut and joint is visible, meaning the craftsmanship is part of the experience.
When you sit in a log sauna, you are not leaning against a layer over a frame. You are held by the very structure itself.
Sustainability through simplicity
Solid timber also simplifies the material list. A layered wall needs framing, insulation, membranes, cladding and lining, and each has its own footprint.
Log construction reduces this to a single material. One wall serves all purposes. No wasteful doubling, no unnecessary layers. By sourcing New Zealand Redwood, a timber grown locally and sustainably, the footprint is reduced even further.
In a time where sustainability is often used as a slogan, true responsibility comes from building in ways that last. A log sauna is not a short-term product to be replaced. It is a structure that endures for decades, even generations.
The human element
Solid timber is also a test of craftsmanship. It demands patience and skill. Each joint must be cut precisely, each log aligned, each roof settled.
This is not a process that can be hidden. Every mistake would be visible. This level of exposure requires a builder who is not only skilled but attentive. It is why each Heritage sauna is built by hand, one at a time.
For those who use these saunas, the human element is felt in every detail. The walls themselves speak of care and permanence.
Permanence as stress relief
It may seem unusual to connect construction with stress relief, but the two are linked. Stress is amplified by environments that feel temporary, fragile, or insincere. Calm comes from spaces that are stable, grounded, and authentic.
A log sauna offers this. When heat rises and silence settles, the knowledge that the walls around you are the very structure itself creates trust. Nothing is concealed. Nothing is false. The permanence of the build reinforces the permanence of the ritual.
A building, not a product
The clearest difference is between a sauna built on site and one shipped as a finished product. A prefabricated pod is made quickly and replaced often. A sauna built into place, whether in solid timber or framed and clad to match the house, is rooted in craft and intended to endure.
Where a site suits solid timber, it is slower and harder to build, and it results in something worth keeping.
Choosing solid timber is about building a sauna whose craft you can see from the bench.
A sauna built from solid timber is both structure and experience. It provides heat, shelter, and silence in one form. It stands without pretence, without layers, without compromise.
A sauna is a place to belong as much as a space to sit, and in a solid timber build, the structure itself is what you lean against.
Let’s Design Your Sauna
From coastal sites to alpine settings,
we help create saunas that feel grounded in their surroundings.