Sauna Interior Size Guide: How Big Should Your Sauna Be?
A well-sized sauna gives you space to spread out, lie down, and share the steam with friends and family. If the room is too small, it feels crowded and uncomfortable. Too large, and you’ll spend time and energy heating space you don’t use. The goal is to find the sweet spot between a cramped torture chamber and an oversized oasis.
This guide will help you decide which sauna size is right for you and how you want your sessions to feel.
How Big Should My Sauna Be?
For most home saunas, a 6’ D x 8’ W interior works beautifully. It offers enough space for four bathers to sit together, or for one person to lie down and stretch out. However, you may be better off going bigger or smaller depending on how you plan to use your sauna.
If the plan is daily solo sessions, you don’t need a ton of room. Weekly sauna parties with family and friends call for a bigger cabin.
Ask yourself the following three questions to get an idea of how big your sauna should be.
The Three Sauna Size Questions
Question #1: How many people will be in the sauna together?
This question is about weekly use, not annual family gatherings. Answer it based on how many people will be in your sauna at the same time every week.
- Each bather should have a 2’ x 2’ square of bench space to sit comfortably.
Question #2: Do you like to sit or lie down?
If you think you might want to lie down, give yourself the option to do so. A sauna is about comfort, relaxation, and restoration. Make it a place you want to be.
- To lie down during sessions, your bench should be 4” - 6” longer than your height.
Question #3: Which bench layout do you prefer?
A single I-bench doesn’t take much space, but it’s less social than an L-bench or double I-bench layout. Pick a sauna size that can fit your preferred layout so you don’t end up with quiet sessions when you’re hoping for conversation.
- The more benches you want, the bigger your sauna needs to be.
Common Sauna Sizes
| Type | Size | Capacity | Bench Layout | Best For |
| Small | 5’ D x 7’ W | 2 Bathers | I-Bench / Small L-Bench | Couples and compact spaces |
| Medium | 6’ D x 8’ W | 4 Bathers | I-Bench / L-Bench | Most common home sauna size |
| Large | 7’ D x 10’ W | 6 Bathers | Double I-Bench / U-Bench | Large families and social sessions |
Sauna Size Examples
Learn about three common sauna layouts from Anton, our resident sauna expert. He’ll explain why each one works, what bench layouts they use, and why you might want them.
The Next Steps
Now that you know how big your sauna should be, it’s time to calculate your sauna’s ceiling height. Read through our Sauna Ceiling and Bench Height Guide to discover the final dimension for your sauna interior.
Frequently Asked Questions
Q: Is a bigger sauna better?
A: Not always. As a sauna gets bigger, it becomes harder to find electric heaters and wood-burning stoves with enough power to heat it properly.
Q: How small is too small for a sauna?
A: A compact sauna can be cozy, but you want to make sure you’re far enough away from the heater so it doesn’t feel like you’re sitting next to a campfire. You also want to have enough space to sit or lie down comfortably. Feeling cramped and roasted is going to leave you with a sauna that never gets used.
Q: What is the best home sauna size?
A: In Finland, one of the most common sauna sizes is 6’ D x 8’ W. This creates enough room for four bathers to sit comfortably, or a single bather to lie down fully.