What Size Sauna Do I Need? A Capacity Guide by Use Case

Getting the size right is the difference between a sauna you use three times a week and one that gathers cobwebs. Too small feels claustrophobic with friends. Too big takes forever to heat and wastes energy. Here's how to choose.

Sauna Capacity Guide

Capacity	Best For	Typical Footprint	Heater Size	Our Models	From Price
2 person	Couples, solo use, small gardens	1.2m × 1.2m	3–6kW	Infrared saunas	£2,395
4 person	Families, regular entertaining	2m × 2m	6–9kW	M-Sanctuary	£11,499
5 person	Most popular — families + a guest	2.2m × 2.2m	9kW	Heat Quad, Sanctuary, Fort Soleil	£9,990
6 person	Social saunas, wellness businesses	2.4m × 3m+	9kW+	The Hideout	£19,995
8+ person	Commercial, mobile sauna businesses	3m+ × 4m+	12kW+	Bespoke builds	Quote

How to Decide: Key Questions

1. How many people will actually use it at once?

Not how many people could use it — how many will, on a typical weekday evening? Most customers tell us they use their sauna as a couple 80% of the time, with friends joining once or twice a month. If that's you, a 4–5 person sauna is the sweet spot: comfortable for two, big enough for occasional groups.

2. Where is it going?

Measure your intended spot. Allow for: the sauna footprint + 50cm clearance on all sides for ventilation and maintenance + the door swing. Our M-Sanctuary at roughly 2.2m × 2.2m fits on a standard patio. The Hideout at 5m length needs a dedicated area.

3. Do you want a changing room?

A vestibule or changing area adds 1–1.5m to the total length. It's worth the extra space if you sauna regularly — somewhere to leave clothes, towels, and a drink without getting them damp. Both our Hideout and bespoke builds include changing room options.

4. Bench layout matters as much as square footage

A well-designed bench layout can make a 4-person sauna feel spacious while a poorly designed 6-person sauna feels cramped. L-shaped or U-shaped benches are the most space-efficient. Two-tier benches give you temperature zones — hotter at the top, milder below.

The Most Common Mistake

Buying too small. We hear it regularly: "I wish we'd gone one size up." A sauna that fits 4 people comfortably will feel tight with 4 people plus towels, buckets, and the inevitable friend who wants to try it. If you're between sizes, go up.

Frequently Asked Questions

What size sauna do I need for 2 people?

A 2-person sauna typically measures around 1.2m × 1.2m. However, many couples prefer a 4-person model for the extra comfort and space. Our infrared models start from £2,395 for a compact unit.

What size sauna do I need for a family?

A 4–5 person sauna is ideal for most families. The Heat Quad (from £9,990) and Sanctuary (from £14,995) comfortably seat a family of four with room for guests.

How much space do I need in my garden for a sauna?

The sauna footprint plus 50cm clearance on all sides. A 5-person sauna like the Heat Quad needs approximately 3m × 3m of garden space including clearances. You'll also need a level, load-bearing base (concrete slab or paving).

Can I get a bespoke size?

Yes. Our bespoke saunas are built to your exact dimensions, capacity, and specification. Request a custom quote or call 0330 133 6617.

Not sure which size? Call 0330 133 6617 — we'll help you match the sauna to your space and how you'll use it.