For apartments, bedrooms, and solo practitioners. These units fit in spaces as small as 35 x 35 inches while delivering the full thermal protocol.
A 1-person cabin needs roughly 35x35 inches of floor space. A 2-person cabin needs roughly 47x47 inches - about 80% more floor area at 30-50% higher cost. If space is the real constraint, 1-person is the answer. If you have the room and plan to use your sauna solo every day for years, the additional interior space of a 2-person unit is worth considering - sessions are more comfortable, and you can lie down if the bench allows it.
Ranked by overall value: footprint-to-performance ratio, electrical flexibility, EMF, build quality, and price.
The interior sitting area - the bench dimensions, not the exterior cabinet - is what determines how comfortable a 40-minute session will be. Under 30x30 in is genuinely tight and difficult to sit comfortably for a full session. 36x36 in is comfortable for most adults. Under 30x30 in is a hard pass for regular use. Check the interior spec, not the exterior cabinet spec, when comparing models.
120V plug-in models work in any standard North American outlet - no electrician and no permit required. This is critical for apartments, condos, and rentals. 240V models need a dedicated circuit (typically 30-60A) and usually cost $200-600 in electrician fees on top of the unit price. Most Amazon-tier 1-person saunas offer 120V. Clearlight Sanctuary 1 requires 240V. If you are not certain you can install a dedicated circuit, filter by 120V first.
Basic configurations cover the rear wall only. Better configurations add side panels. Floor heaters add a meaningful thermal dose to the lower legs and feet - Clearlight includes an under-bench floor heater standard, which most competitors skip. JNH's 360-degree layout covers back, both sides, and below the bench simultaneously. More coverage area means a more even thermal dose and faster core temperature elevation per session.
Most 1-person saunas use tongue-and-groove panel assembly - the walls interlock without screws or special tools. Typical assembly time is 2-3 hours for one person working alone. The main variables are heavier models (Clearlight is 250+ lbs) that benefit from two people, and whether the electrical connection is a simple plug-in (Dynamic, JNH) or requires wire connection to a breaker box (Clearlight at 240V).
Most 1-person saunas rate 265-300 lbs bench capacity. A small number of budget models rate lower at 220-250 lbs. If your weight approaches the rated capacity, check the spec sheet and not just the Amazon listing title - manufacturers sometimes list maximum capacity in fine print. The bench is typically the limiting structural component.
Every unit ran daily sessions in a controlled 22°C ambient room in Helsinki. We logged EMF at three positions (panel face, mid-cabin, and seated body position), heat-up curves, surface temperature uniformity, and energy draw on calibrated meters.