Sauna Dekor Spa Solutions engineering team, Istanbul · project and press enquiries: Alican Aykaç, Managing Partner

Last updated: 22 October 2026

Short answer: a two-person sauna starts from 1 straight bench about 1,200 mm long, 600 mm per seated person on Harvia’s guidance, with the upper bench 1,100 to 1,200 mm below a ceiling of 2,100 to 2,300 mm. Sauna Dekor Spa Solutions builds saunas of every size, and this guide sets out the 6 decisions that make the smallest cabin work: bench, depth, ceiling, heater, place and build type.

Every figure below comes from a heater or sauna maker’s published guidance, Harvia and Tylö, and each source is linked at the end. Where a maker publishes no figure, we give the decision rather than a number of our own.

How big is a two-person sauna?

Big enough for 1 bench of about 1,200 mm, the room around it and an outward-opening door. Harvia gives 600 mm of bench length per seated person, so 2 people sitting side by side need 1,200 mm. The room’s other dimensions follow from the bench depth, the ceiling height, the heater’s clearances and the door swing.

That makes the bench the starting point, not the floor area. A cabin is drawn around its benches: the length that seats 2, the depth that lets them sit or lie, a step below if the upper bench is high, and the free space the heater’s manual asks for around it. Only then is the outside size known.

Two people who want to lie down rather than sit need a longer bench, long enough for an adult, and that changes the room more than any other choice. Decide at the start whether the sauna is for sitting or for lying; our guide to choosing the right sauna room walks through the same choice for larger cabins.

Which bench layout works for two people?

A straight bench on 1 wall, in 2 tiers: an upper bench to sit on and a lower bench or step below it. Harvia’s guidance favours straight benches in small saunas, gives upper bench depths of 500 or 600 mm, and puts each step at about 350 mm, so 2 tiers fit in the height of a normal room.

The upper bench is where the heat is, so it is the one sized for the 2 guests. The lower tier is a step and a footrest; in a small cabin it can be shorter or partly cut back to leave floor space at the door. An L-shaped bench gives a third seat but costs floor, and its corner seat is cramped for 2 adults.

Facing benches need a wider room. Harvia gives 2,200 mm as the minimum room width for 2 benches facing each other, which is more than most two-person cabins have. For 2 people, 1 wall of benches with the heater on the opposite or side wall is the efficient plan.

How high should the ceiling be?

Between 2,100 and 2,300 mm in Harvia’s installation manual, with the upper bench 1,100 to 1,200 mm below the ceiling. A lower ceiling keeps the hot air close to the bench in a small room; a higher one leaves heat above the guests’ heads that the heater still has to produce.

The ceiling and the upper bench are fixed together. With a ceiling at the lower end of Harvia’s range, a 2-tier bench with steps of about 350 mm still leaves the upper bench at the right distance below it. Raising the ceiling means raising the bench, which means adding a step, which takes floor.

This is one reason small saunas are rarely built to the full height of a modern villa room. Where the room is higher, the sauna gets its own lowered, insulated ceiling, and the void above it carries the ventilation duct and the lighting cables. Our article on sauna ventilation covers the air path; Harvia sizes it at 6 air changes an hour.

Which heater size does a two-person sauna need?

The one whose published volume range contains the room’s calculated volume. Harvia’s base rule is about 1 kW per m³ of an insulated timber room, plus about 1.2 m³ for every m² of glass or stone. Tylö’s table puts its 6.6 kW Sense Combi at 4–8 m³; EOS gives each heater its own range for a standard timber cabin.

The steps are the same for any size of room:

1. Measure the inside volume after lining: width × depth × height.
2. Add the glass correction: each m² of glass door or glass wall, multiplied by Harvia’s 1.2 m³ factor, is added to the volume.
3. Read the maker’s table: choose the heater whose minimum and maximum volume range contains the calculated figure.
4. Check the clearances: the manual sets the distance from the heater to the bench, the walls and the ceiling, which in a small cabin decides where the heater can go.

A small room is where the glass correction matters most. A glass door is a large share of the wall area in a two-person cabin, so it can move the calculated volume into the next heater’s range. EOS states that its ranges assume a standard timber sauna and are a non-binding suggestion; the room’s materials decide. Our overview of types of sauna heaters covers the heater families.

The electrical supply follows the heater, not the room. Even a small heater needs a dedicated circuit, a correctly rated breaker and cable, and the residual-current protection the local code and the maker’s manual set. Our note on sauna electrical requirements sets out what goes to the electrician first.

Where does a two-person sauna fit: bathroom, bedroom or terrace?

All 3 work, and each sets 1 condition. In a bathroom it is the door swing and the shower nearby. In a bedroom suite it is the air path and noise. On a terrace it is the weather: an outdoor cabin needs its own roof, a weatherproof skin and a power supply rated for outdoor use. Harvia requires the door to open outward.

The bathroom is the most common place, because the shower is next door and the floor already drains. Our guide to the bathroom sauna covers the 3 checks that decide it: the outward door swing, the distance to the shower and the electrical supply. A bedroom suite adds a dressing area and a quieter room, but needs a planned exhaust so warm air does not go into the bedroom.

A terrace sauna takes the same bench and heater rules outdoors. What changes is the shell: a roof that sheds rain, walls insulated against the outside temperature as well as the inside heat, and a door that seals against wind. In every place, the heater’s manual sets the clearances, and the room is drawn around them.

Prefabricated kit or built in?

A kit is the quicker route when a standard size fits the room; a built-in sauna is the route when the room is not standard. Kits come in fixed outside sizes with the bench, the door and the heater chosen by the maker. A built-in cabin is drawn to the measured room, so the bench, the door and the glass follow the space.

In a two-person sauna the difference is usually a matter of centimetres. A kit that is a little too wide for a bathroom niche cannot be trimmed; a made-to-measure cabin uses the full width and puts the door where the swing is free. A kit also fixes the heater, while a built-in cabin lets the heater be chosen from the maker’s table for the room’s real volume and glass.

Service follows the same line. A kit’s parts come from its maker, and a built-in cabin’s timber and joinery come from us, while in both cases the heater, the control panel and their certification belong to the heater’s manufacturer.

What changes in a Gulf villa?

3 things: the air conditioning, the glass and the power. A villa sauna in the Gulf sits in a cooled house, so its exhaust must not pull conditioned air from the next room; its glass door counts against the heater as anywhere else; and its supply is often coordinated with a full villa electrical plan rather than added later.

The air conditioning is the one that catches owners out. When the sauna’s exhaust runs into a cooled corridor or bedroom, the room next door feels warm and damp after every session. We route the exhaust to an extract or to outside, as the heater maker’s manual and the villa’s mechanical design allow, and keep the sauna’s door away from the AC return grilles.

Glass is the second. Gulf villa owners often want a glass door and a glass side panel even in a small sauna, and in a two-person cabin that glass can be a large part of the wall area. It is counted in the heater calculation from the first drawing. Our page on saunas in Dubai shows how we plan villa saunas in the UAE.

Who builds this

Sauna Dekor has designed, manufactured and installed saunas, steam rooms, hammams, pools and cold plunges since 1987: 40 years of manufacturing in Istanbul, in our own facility in İkitelli OSB, with a team of 19 employees and 5,000+ projects in 35+ countries. We work under TS EN ISO 9001:2015, certificate no. 202025106. Our offices are in Istanbul (İkitelli OSB), Dubai (Latifa Tower, World Trade Centre), Bodrum (Bodrum Çarşı), Germany (Monheim am Rhein) and Boston (66 Long Wharf, Unit 4B). We also have representative offices in Haarlem and Doha.

We build the sauna cabins, benches and linings in our own workshop. We do not make sauna heaters: EOS, Harvia and Tylö heaters are their manufacturers’ products, and their CE marking and conformity belong to those manufacturers. On the work we deliver, the terms are a 24-month warranty on workmanship and manufacturing; 24-month manufacturer’s warranty on electrical and mechanical equipment; 5-year warranty on structure and waterproofing.

Frequently asked questions about two-person saunas

How long should the bench be in a two-person sauna?
About 1,200 mm for 2 people sitting. Harvia gives 600 mm of bench length per seated person, so 2 seats need 1,200 mm. If the 2 guests want to lie down, the bench must be long enough for an adult, which makes the room longer.

How high should a two-person sauna be?
Harvia’s installation manual puts the ceiling between 2,100 and 2,300 mm, with the upper bench 1,100 to 1,200 mm below it. A lower ceiling within that range keeps the heat near the guests in a small room, and steps of about 350 mm reach the upper bench.

What size heater does a two-person sauna need?
The heater whose volume range in the maker’s table contains the room’s calculated volume. Harvia’s rule is about 1 kW per m³ plus 1.2 m³ for each m² of glass; Tylö’s 6.6 kW Sense Combi, for example, is rated for 4 to 8 m³.

Does a glass door change the heater for a small sauna?
Often, yes. Harvia adds about 1.2 m³ of design volume for every m² of glass, and in a two-person cabin the door is a large share of the walls. The corrected volume can move the room into the next heater’s range in the maker’s table.

Can a two-person sauna go in a bathroom?
Yes, if the door can open outward into free floor, the shower is close and the electrical supply can be brought to the heater. Harvia requires an outward-opening door, so the swing must not hit the vanity, the shower screen or the bathroom door.

Is a kit or a built-in sauna better for two people?
A kit suits a room that matches one of its fixed sizes. A built-in cabin suits a room that does not, because the bench, the door and the glass are drawn to the measured space and the heater is chosen for its real volume.

Sources

• What to consider when choosing sauna benches: frequently asked questions — Harvia. 600 mm per seat, the 1,100–1,200 mm upper bench to ceiling distance, 500 and 600 mm bench depths, the 350 mm step and the 2,200 mm minimum width for facing benches.
• How to design a sauna? — Harvia. The 60 cm seat width and straight benches in small saunas.
• Harvia Spirit — owner’s and installation manual — Harvia, dealer-hosted copy. The 2,100–2,300 mm ceiling height, six air changes an hour and the outward-opening door.
• How do I select the correct heater power? — Harvia support centre. About 1 kW per m³ and about 1.2 m³ per m² of glass, stone or other non-insulated surface.
• Sense Combi Elite / Pure installation manual — Tylö. Table 1: 6.6 kW for 4–8 m³.
• Technical downloads — EOS Saunatechnik. Installation manuals with the volume range of each heater for a standard timber cabin.