Pre-Purchase Site Checklist

Why the site check comes first

A sauna is a fixed installation. Unlike a towel rack or a mirror, it cannot be adjusted after delivery. The most common reason a sauna order ends in a return or a frustrating install is a mismatch between the unit and the site: the footprint is a few inches too large, the ceiling is too low, the wrong circuit feeds the room, or the floor cannot tolerate the moisture. Every one of those problems is visible before you order, and each one is cheap to fix if you catch it early.

The site work breaks into three categories: measurements, power checks, and surface notes. With the measurements in hand, you can compare a 1-person versus a 2-person cabin, an indoor versus an outdoor unit, or a traditional versus an infrared model. With the electrical facts, you know whether you need an electrician before the delivery truck arrives. With the surface notes, you know whether to plan for a floor change.

This article walks through the checklist in the order you should complete it, so you can work through the items once and write down the answers.

Measurements to take before you order

The first numbers you need are the floor dimensions and ceiling height of the space where the sauna will go. For a traditional sauna, the sizing target is the room volume: length times width times height gives you cubic footage, and that volume determines which heater size can bring the room to temperature. If you are considering an outdoor cabin or an indoor sauna room, measure the interior space the same way, because the heater rating has to match the room it will heat.

Beyond the room itself, measure the path the sauna will take to get to its destination. Note the width of every doorway, the height of every ceiling, and the turning radius in hallways and staircases. Sauna kits and assembled cabins arrive in large boxes, and the delivery route matters as much as the final location. If the product comes in panels, check that each panel fits through the door; if it arrives assembled, the delivery access is a hard constraint.

Also measure the planned footprint of the sauna itself against the floor space you have, including a margin of a few inches on every side for leveling and adjustment. For indoor units, you will also want to know the ceiling height requirement, because some cabins and steam rooms need a ceiling above a minimum height. The preferred ceiling height for a steam room is about 7 feet to avoid temperature variation between floor and ceiling.

• Floor length and width of the room where the sauna will sit, plus a few inches of clearance on each side.
• Ceiling height of the room, to verify the sauna or steam room fits.
• Width and height of every door, hallway, and stairway along the delivery route.
• The path length and turning radius from the delivery entrance to the final location.
• The room volume in cubic feet, which you will need for heater sizing.

Power checks: what the circuit must provide

The electrical service is the second set of facts to gather, and it is the one that surprises buyers most often. A traditional sauna heater is a large electrical load. The heater needs a dedicated circuit, sized to the heater's draw, and that circuit has to be available at the sauna location. For most heaters above a small size, that means a 240V circuit on a breaker that matches the heater's rating.

For a steam generator, the same rule applies. A steam generator needs a dedicated 240V electrical circuit plus a cold water supply line at the generator's location, and a drain line if you want to flush it regularly. Those are three separate utilities that must exist or be installed before the generator runs. If you are planning the steam room in a bathroom that has no spare circuit, that is a construction task, not a plug-in task.

You can check the basics yourself: look at the main electrical panel, note the amperage of the main breaker, and count how many spare breaker slots are open. That tells you whether there is room for a new circuit. The actual wire size, breaker sizing, and code compliance are the electrician's call. If the panel is already full, or if the house wiring is older, plan for an electrician visit before you place the order.

For infrared saunas, the load is lower, and many plug into a standard household 120V outlet. Even so, the outlet must be on its own branch circuit or at least not share a circuit with other heavy loads. Check which outlets in the room share a breaker, and note which one you will use for the sauna.

• Main breaker amperage and the number of open slots in the panel.
• Whether a 240V circuit is available at the sauna location for heaters and steam generators.
• Whether a 120V outlet with a dedicated or lightly loaded circuit is available for infrared or portable units.
• Whether a cold water supply line and a drain line are available if the unit is a steam generator.
• Whether your local code requires a permit and an inspection for the new circuit.

Surface and floor notes

The third set of checks covers the surface under the sauna and the walls around it. The floor is the most important surface. A traditional sauna, where you can pour water on the stones to raise humidity, produces moisture that drips. The floor needs to handle that without absorbing water. Cement, tile, or another non-absorbing material is the right choice. Carpet should never be used, because it absorbs sweat and odors.

Infrared saunas are different: they do not use poured water, so humidity stays low, and a wood or tile floor is fine. A wooden floor under an infrared cabin is acceptable, provided you put a mat or barrier under the unit to make cleaning easier. The same rule applies to portable units: they go on a flat surface, and the surface should be easy to wipe down.

The walls around the sauna also matter. A sauna produces heat and some moisture at the seams and vents, so the wall surface behind and beside the unit should be cleanable and preferably moisture resistant. Tiles, painted drywall, or wood paneling are all workable. The key is knowing what is behind the finish, because you do not want a sauna up against a wall that traps moisture and grows mold.

For outdoor units, the surface check includes the foundation. An outdoor cabin needs a level, stable base that keeps the structure off the ground, and the base must stay level through freeze and thaw if you are in a cold climate.

• Floor material: non-absorbing (tile, concrete) for traditional saunas; wood or tile for infrared.
• No carpet under any sauna, including portable units.
• Wall surfaces near the sauna: cleanable and moisture resistant.
• For outdoor cabins, a level foundation that will stay level season to season.
• Access to a drain or a bucket for cleaning, if the sauna is traditional or a steam room.

Ventilation and clearance

Two more checks complete the site review: clearance and ventilation. Every sauna needs a minimum clearance around the heater and between the unit and the walls. A sauna heater has a listed clearance to combustible materials, and the same rule applies to the sauna itself against a room wall. If the room is tight, measure the clearance before you commit.

Ventilation is the second item. A traditional sauna room needs a vent, usually high and low, to keep the air fresh while you sit in heat. An infrared cabin can run in a closed room, but you still want some airflow for comfort during the session. A steam room typically has no ceiling vent inside; the moisture clears when you shower after the session. That means the room around a steam shower, outside the door, needs an exhaust fan to pull the humidity out.

• Heater clearance to walls and benches, from the spec sheet or the manual.
• Sauna unit clearance to walls and ceiling in the room.
• A way to bring fresh air into the room during a session.
• An exhaust fan outside a steam room door to remove moisture after use.

Use the checklist that fits your plan

The three sets of checks lead to different buying decisions. If the floor is carpet, you are narrowing your options to infrared or portable units that can sit on a mat, or you are planning a floor change. If the panel has no spare capacity, you are budgeting for a panel upgrade or a subpanel, which is an electrician's job. If the room volume is on the small side, you are looking at compact cabins or a 1-person unit. If the room is tall, you have room for a taller cabin.

The measurement work also feeds the heater sizing decision directly. The room volume in cubic feet is the number you bring to the heater comparison. If you already know the volume, you can read the heater specs and match the kilowatt rating to the space.

When the site check is done, you can order with confidence. The unit you choose will fit, the power will be there or will be scheduled, and the surface under the sauna will handle the moisture. That is the position every buyer wants to be in before the delivery truck arrives.

If you are still choosing between a traditional sauna, an infrared cabin, or a steam shower, the site check narrows the field. A steam generator needs the water supply and drain lines, which pushes you to a bathroom or a space with plumbing access. A traditional sauna needs the 240V circuit and a non-absorbing floor. An infrared model needs the least from the site. Start with the site, and the right type of sauna for your home becomes clear.

When to call in a professional

Most of the checklist is straightforward measuring and noting what is already there. Two items deserve a professional: the electrical circuit and, for outdoor units, the foundation. A sauna heater draws enough current that the wire size, breaker size, and local code compliance matter. That is an electrician's decision, not a DIY guess. The same applies to the steam generator's plumbing connections.

Your local codes may require a permit for the new circuit. Check with the building department before the electrician starts, because the permit affects the timeline. If the unit goes outside, check the setback rules and any homeowner association restrictions before you order an outdoor cabin.

The cost of a professional site visit is small compared to the cost of a sauna that arrives and cannot be connected. If you are unsure about the electrical panel, the floor load, or the foundation, book a consult before the order date. That one visit answers every open question on the power and surface side of the checklist.

The complete checklist

Use this list as your final review before confirming any order. Each line should have a written answer, not a mental note, and the answers point you to the product category that fits.

Once the checklist is complete, you can move on to selecting the unit. The measurements match you to the right size sauna, the power check tells you whether to look at portable setups or a permanent cabin, and the surface notes tell you whether you need floor preparation before delivery.

• Room floor dimensions and ceiling height recorded in writing.
• Delivery route measured (doors, hallways, stairs, turn radius).
• Room volume in cubic feet calculated for heater sizing.
• Electrical panel: main amperage, open slots, spare capacity for a new circuit.
• 240V circuit available or scheduled for traditional heaters and steam generators.
• 120V outlet available and on a light circuit for infrared or portable units.
• Cold water supply and drain line confirmed for steam generators.
• Floor material verified as non-absorbing for traditional saunas.
• No carpet under any unit, including portable.
• Wall surfaces around the sauna are cleanable and moisture resistant.
• Outdoor foundation plan is level and seasonal stable.
• Heater and sauna clearances to walls and benches are confirmed.
• Ventilation plan exists for the room (vents or an exhaust fan).
• Code requirements and permits for the circuit and outdoor structures are checked.

What to check for your site

Questions

What measurements do I need before ordering a sauna?

You need the floor length and width of the installation area, the ceiling height, the room volume in cubic feet, and the dimensions of every doorway, hallway, and stair along the delivery route. The room volume determines heater sizing for a traditional sauna, and the delivery path determines whether the unit can physically arrive.

Do I need a 240V circuit for a sauna?

Most traditional sauna heaters and all steam generators need a dedicated 240V circuit, sized to the heater or generator rating. Infrared saunas typically plug into a standard 120V outlet. Check your electrical panel for spare capacity and a compatible circuit before ordering, and have an electrician confirm the sizing and code compliance.

Can a sauna go on carpet?

No. Carpet absorbs sweat and odors and is not a suitable floor for any sauna. Traditional saunas need a non-absorbing floor like cement or tile. Infrared saunas can sit on wood or tile, and portable units can sit on a mat placed over a cleanable floor.

What floor is best for a traditional sauna?

Cement, tile, or any floor that does not absorb water is the recommended surface for a traditional sauna, because you may add water to the stones, and moisture will drip. Infrared saunas do not use poured water, so wood or tile is acceptable.

Do I need a drain for a sauna?

A drain is not a requirement for a sauna. It can be convenient in a commercial setting for cleaning. A steam generator does need access to water: a cold supply line for operation and a drain line if you want to flush the tank regularly.

Should I hire an electrician before or after I order?

Before. The electrical panel capacity, the availability of a 240V circuit, and the need for a permit and inspection are all questions the electrician answers, and the answers determine whether your chosen sauna can be connected. A professional site visit before ordering avoids the situation where the unit arrives and cannot be wired.