A deck is where most people picture their outdoor sauna: a few steps from the back door, with a view over the yard. Whether the deck can carry it is a question the listing won’t answer for you.
The good news is that a sauna is much lighter than a hot tub. The catch is that “lighter” still means close to the limit a standard deck is designed for. This article shows the arithmetic. For choosing a sauna, start with the home sauna buying guide.
Short answer: an outdoor sauna puts roughly 25 to 30 lbs on each square foot empty and over 40 with people in it. That is right at the standard deck design load, so get the deck checked before you order.
What a deck is designed for
The American Wood Council’s deck guide, DCA 6, sizes joists, beams, and connections for a live load of 40 pounds per square foot (psf), spread evenly, plus 10 psf for the deck’s own weight. The Council notes that the International Residential Code requires 40 psf for decks. It also says concentrated loads are beyond the guide’s scope and need a design professional.
Two things follow. A deck built to the standard has a known design figure you can compare against. And an older deck, or one built without a permit, may not meet it.
Four saunas compared
| Sauna | Weight | Footprint | Empty | With bathers |
|---|---|---|---|---|
| Redwood Outdoors barrel | 900 lbs | 35.9 sq ft | about 25 psf | about 45 psf (4 people) |
| SaunaLife Ergo E8 | 1,345 lbs | 48.9 sq ft | about 28 psf | about 49 psf (6 people) |
| Golden Designs Nora | 875 lbs | 29.3 sq ft | about 30 psf | about 42 psf (2 people) |
| SaunaLife Ergo E7 | 1,213 lbs | 39.9 sq ft | about 30 psf | about 48 psf (4 people) |
Weights and dimensions from manufacturer and dealer listings, checked September 2026. The E7 figure is its shipping weight. Per-square-foot figures are our arithmetic, using 175 lbs per bather as an illustration. Stones and any separately shipped heater add to these weights.
Compare that with a hot tub. The spas we list put 41 to 88 psf on their base before anyone gets in. A sauna is a far smaller load. It is still at or above 40 psf once people are sitting in it.
Why a barrel is a special case
Here’s what the spec sheet won’t tell you. The table divides each sauna’s weight by its whole footprint, as if the load were spread like a rug. A cabin with a flat floor comes close to that.
A barrel doesn’t. It rests on a few wooden cradles, so all of its weight lands on a few narrow strips. On a deck, those strips may sit across the joists or between them. The same 1,345 lbs is a very different load depending on where the cradles land.
That is what the Wood Council means by a concentrated load. For a barrel on a deck, I’d treat an engineer’s or experienced deck builder’s check as required, not optional.
What the listing leaves out
Several of the outdoor saunas we list publish no weight or no footprint:
- The Dundalk MiniPOD gives 1,403 lbs gross but no dimensions.
- The Dundalk Serenity gives 1,113 lbs but no dimensions.
- The Almost Heaven Salem and SaunaLife Model G2 give dimensions but no weight in our data.
You need both numbers. Ask the dealer for the assembled weight, the footprint, and, for a barrel, the number and spacing of the cradles. Add the heater and its stones if they ship separately.
Three more deck checks
Heat and fire. An electric sauna heater sits inside the cabin, and the maker’s manual gives clearances to walls and floor. A wood-burning stove is different: it needs a chimney, clearances to anything that burns, and often a permit. Ask your building department before putting a wood-fired sauna on or near a wooden deck.
Water. A traditional sauna drains a little water from the floor when you pour on the stones or rinse the benches. On a deck, that water drips through the boards. Make sure nothing is stored underneath.
Wiring. The cable for a 240V heater has to reach the sauna. On a deck it usually runs underneath in conduit. Plan the route with your electrician before the sauna is in the way.
Base options at ground level
If the deck doesn’t check out, the usual answer is a base beside it:
- Concrete pad. Level, permanent, and able to carry any sauna we list.
- Compacted gravel in a timber frame. Cheaper, drains well, and suits barrels and cabins.
- Pavers on a compacted base. Good under a flat-floored cabin.
A sauna at ground level next to the deck still gives you the short walk from the door.
My rule of thumb: a flat-floored cabin on a newer, permitted, low deck is a reasonable question to put to a builder. A barrel on a raised deck needs an engineer.
To see how three saunas compare on price and what’s included, read our home sauna comparison.
Bottom line: a sauna is light for its size and still enough to reach a deck’s design load. Get the weight, the footprint, and a qualified opinion before it ships.
Sources
- Showalter J. and Ross L. (American Wood Council), “Residential Wood Deck Design,” STRUCTURE magazine, April 2017: awc.org
- American Wood Council, FAQ on the 40 psf live load in DCA 6, September 30, 2021: awc.org
- Redwood Outdoors, SaunaLife, Golden Designs, Dundalk Leisurecraft, and Almost Heaven listings (weights, dimensions), checked September 2026