Strong option
Concrete slab
Durable, stable and straightforward to level when properly constructed.
Learning Center · Outdoor Planning
What Goes Under an Outdoor Sauna?
The foundation is not the glamorous part of a backyard sauna, but it is one of the most important. The sauna needs a stable, level base that supports the structure and keeps it properly aligned.
The goal
Flat. Level. Solid. Permanent.
Those four words are a good starting point. Hekla’s current outdoor guidance specifically calls for a flat, level, solid and permanent base and identifies a concrete slab as an ideal option. Reinforced patio or paving over a proper solid sub-base can also work for its outdoor products.
Potential option
Reinforced paving
Can work when installed over a suitable solid sub-base and when permitted by the sauna manufacturer.
Verify first
Existing patio
An existing surface may be usable if it is structurally appropriate, level and large enough for the exact sauna.
Grass, loose soil and an improvised soft base are not a shortcut.
A structure that settles or twists can cause alignment problems with walls, doors and glass. Build the base for the sauna you are actually buying.
Plan more than the footprint
The sauna has to be delivered and assembled too.
01
Choose model
Get the exact footprint and installation manual.
02
Check access
Confirm a clear route for components and installers.
03
Allow workspace
Some builds require clear working space around the footprint.
04
Plan utilities
Coordinate electrical routing before build day.
Hekla’s current pre-delivery guidance asks for roughly 1 meter—about 39 inches—of clear space around its outdoor sauna footprint for assembly. Requirements can vary by model and manufacturer, so confirm before building against a fence, wall or property feature.
Pittsburgh weather
Think about water and winter too.
The finished site should not encourage water to collect around the sauna. Drainage, snow management, roof runoff and a safe walking path all matter when the sauna is going to live outdoors year-round.
Do not pour the pad from a catalog picture.
Choose the exact sauna first. Then use its current footprint, clearance requirements and utility entry locations to finalize the site.
Planning an outdoor sauna?
We can help you get the footprint before you build the base.
That is much easier than trying to make the sauna fit a pad that was poured for the wrong dimensions.
Explore Outdoor Saunas →Indoor vs. Outdoor