Where to Put a Sauna in Your House

Start with the basics

Before choosing a room, think about what a sauna or steam unit needs. A traditional sauna generates dry heat, often between 150 and 195 degrees Fahrenheit, according to Cleveland Clinic. An infrared sauna runs cooler, usually between 110 and 135 degrees. A steam generator sends moist, hot air into an enclosed shower or steam room. Each type has different requirements for flooring, ventilation, and clearance. Your decision also depends on whether you prefer a traditional sauna or an infrared model.

The same practical limits apply to all rooms: a waterproof or water-tolerant floor, a way to manage heat and steam, enough space for the unit to operate safely, and a structure that can support the weight of a full sauna or a water-filled steam generator. The Finnleo FAQ is direct on flooring: for traditional saunas, use cement, tile, or anything that does not absorb water. For infrared saunas, wood or tile is fine. Carpet should never be used because it absorbs sweat and odors. If you are still weighing indoor versus outdoor, review the indoor vs outdoor decision factors before committing to a room.

Bedrooms: comfortable but watch the floor

A bedroom is a popular spot for a sauna cabin because it is usually a quiet, private space with enough wall area. The main problem is the floor. Most bedrooms have carpet, which you would need to remove under and around the unit. A water-resistant flooring like tile or a sealed wood floor is the better base. If you are placing a sauna on a second floor, check the joist orientation and consider the combined weight of the cabin, the heater, and the people inside. A smaller cabin, such as a 1-person sauna or a compact model for small spaces, is more forgiving on upper floors.

Ventilation is the second issue. A bedroom is designed for sleep, not for repeated hot, humid sessions. You need a window that opens, a ventilation fan, or at least a door that you can keep open after use to dry the room out. Without that, moisture can work into the drywall and cause mold over time.

• Remove carpet and use tile or wood under the sauna.
• Confirm the floor framing can handle the weight, especially on upper floors.
• Plan for post-session drying: open a window, run a fan, or leave the door open.

Basements: the default pick for traditional saunas

Basements are the most common place in the house for a sauna, and for good reason. The floor is usually concrete, which is the ideal base for a traditional sauna. You also get a lower ambient temperature, which makes it easier to heat up the sauna room itself relative to the surrounding space. And any drips or spills are easy to wipe up, especially if you also put in a small drain. The Finnleo FAQ notes that a drain is not required for a sauna, but it can be convenient for cleaning, particularly in a traditional sauna where you might splash water on the stones. For more on the specific challenges of a basement, read our basement sauna considerations and the heater sizing notes for basements.

The basement does come with caveats. You need to check for moisture problems first. A damp basement will fight against your sauna and your home at the same time. Make sure the space is dry, has a vapor barrier on the walls if the soil outside is wet, and has enough ceiling height. You also need ventilation to let the room dry after use. If the basement has no window, consider a mechanical fan that vents to the outside.

For a steam generator, a basement is a perfectly acceptable location, says the Amerec FAQ, as long as it is a dry, ventilated space that is not exposed to freezing temperatures. The generator itself goes in a closet, cabinet, or on a wall near the steam shower. You want it close to the shower to keep the copper steam line short.

Bathrooms and steam showers

A bathroom is the only room in the house that is already built to handle moisture. You have waterproofed walls, a floor drain, a ventilation fan, and a water supply. That makes it the obvious home for a steam shower system. Mr. Steam's remodeling guide says an opening as small as 3 by 3 feet is enough for a steam shower. That is a compact footprint, but the room has to be fully enclosed with a door that you can seal. For residential steam systems, browse our steam generators for a shower guide, and if you are unsure whether steam is right for you, compare steam showers vs saunas.

The key for a steam shower is the generator, not the sauna. The Amerec FAQ recommends placing the steam head 18 inches above the shower floor and on a wall as far as possible from where you sit. You also want the generator close to the shower to minimize the length of the copper steam line. If you are putting a dry sauna or an infrared cabin in a bathroom, it will work, but the bathroom is rarely the best spot unless you have a very large one. The shower area is taking up the floor space, and you are adding a hot box on top of an already humid room. Better to keep the dry sauna in a bedroom or basement and put your steam unit in the bathroom.

For a steam shower, you also need a dedicated 240-volt circuit and a cold water supply line to the generator, according to the Amerec FAQ. The ceiling height matters too: the ideal ceiling height for a steam room is about 7 feet, as taller ceilings cause uncomfortable temperature differences, with hot air pooling up high and cool air near the floor.

Spare rooms: turn an unused room into a sauna

A spare room or a home office you do not use is a natural place for a freestanding sauna cabin. You get privacy, a window for ventilation, and usually standard 8-foot ceilings, which are fine for most cabins. The biggest consideration is the floor. If the room has hardwood or a wood subfloor, you can put an infrared cabin directly on it, but the Finnleo FAQ notes that for a traditional sauna, the best floor is cement, tile, or something that does not absorb water. A spare room often has a wood floor, so you would want to lay down tile or a water-resistant mat under the sauna. For a deeper look at converting a spare room, see our spare room conversion guide.

The room size also matters. A sauna heater should be sized to the cubic footage of the sauna room itself, not the room around it. Most freestanding cabins are sold with the heater already sized for that volume. If you are building a sauna room in the spare room, measure the length times width times height to get the cubic feet, then match that to a heater rating. You also need clearance around the heater for safety and airflow. For a wide selection of indoor cabins, check our indoor sauna gear list.

• Measure the room, not the cabin, for floor space and access.
• Plan for a wider doorway if the cabin arrives assembled.
• Check the window or fan to control humidity after sessions.

How to decide for your home

Start with the type of heat you want. If you want a traditional sauna, the basement is the easiest choice because of the concrete floor and the lower surrounding temperature. If you want a steam shower, the bathroom is the only realistic spot unless you build a dedicated steam room. If you want an infrared cabin and you want it close to a bedroom or living area, a spare room on a ground floor works well, provided you replace carpet with a hard floor and have a way to dry the room. For a compact installation, see our best saunas for small spaces.

Once you decide on the room, you can pick the right size and style of unit. A small cabin fits in a spare room or a large bedroom. A taller cabin with a lower bench suits a basement with higher ceilings. For a bathroom, look at steam generator systems rather than a cabin. Match your choice to the room's dimensions and the electrical situation: a 240-volt circuit for a traditional heater, or a 120-volt outlet for most infrared cabins, as the Finnleo FAQ notes.

Finally, think about what you will do right after the session. You will be hot, maybe wet, and you will want a shower. If the sauna is in the basement and the shower is two floors up, that is a long walk. If it is in a spare room next to the bathroom, you are closer to the rinse and the cool-down. Place the sauna where the after-session routine is easy, not just where the construction is easy. Weigh the pros and cons further in our indoor vs outdoor decision factors article.

What to pick for your placement

Questions

Can I put a sauna on carpet?

No. Carpet absorbs sweat and odors, and it holds moisture against the floor. Finnleo explicitly says carpet should never be used. You need to remove carpet and use a tile, wood, or concrete floor. For indoor cabins, see our indoor sauna gear for options that work on hard floors.

Does a sauna need a floor drain?

A drain is not required, but it is convenient, especially for a traditional sauna where you splash water on the stones. For a steam shower, a drain is essential because the room is wet at floor level. For a dry sauna, you can skip it if your floor is easy to wipe down.

Can I put a sauna in an upstairs bedroom?

Yes, but you need to check the floor structure. A traditional sauna with stones and a heater is heavy. An infrared cabin is lighter, but still requires a sturdy base. Place the cabin over joists rather than between them, and consider a smaller unit for upper floors. A 1-person sauna is a lighter option.

What is the best room for a steam generator?

Put it close to the steam shower, in a dry, ventilated space that is not exposed to freezing temperatures, according to Amerec. A closet, a cabinet under the bench, or a basement wall are all common choices. Keep the copper steam line as short as possible. More details are in our steam generator guide.

What ceiling height do I need for a steam room?

About 7 feet is ideal, as stated in the Amerec FAQ. Taller ceilings cause heat to pool near the top and leave the floor cooler. For a traditional sauna cabin, the ceiling height is part of the cabin itself, so you only need enough room in your house to fit the cabin.