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How To Build A Sauna In Your Basement: 5 Step Guide

Are you trying to build a sauna all by yourself? We know how difficult it is for you. Don’t you worry! With our proper guidance, we’ll have your sauna set up in no time.

How to build a sauna in your basement?

First, you’ve to find a spot in the basement to start. Then frame your wall and install the power units. After that, install the walls. And finally, set up your heater. Do keep in mind the measurements of your basement while doing so. 

This was only a little peek into the process. Interested in the entire segment? What are you waiting for, let’s jump in!

5 Steps To Installing A Sauna

A sauna will be a perfect addition to your lifestyle. The health benefits are uncountable and they are a great way to relax. 

Grab your safety gears and your toolbox. Let’s get started!

Essential Tools You’ll Need

Before we dive into the process, you’ll need a few tools to start off. Here’s a list of them:

  • Measuring tape
  • Heater
  • ½ Inch Plywood Pieces 
  • Bench Saw
  • Zinc Plated Screws
  • 13 or 8 Inches Flat Cedar Wood

Now, that we have our essentials, let’s get to the installation!

Step 1 of 5: Figuring The Right Spot For Your Sauna

We’ve already established our place, the basement. But where do we start? To make this a little simple, a corner will be perfect.

Why a corner you ask? This is because we already have two out of four walls there. This will therefore be cost-effective for you. Moreover, this will also save your time and energy. 

Furthermore, another benefit is that the exterior walls let the air escape. Hence, the corner will be your perfect spot.

Step 2 of 5: Measure And Frame Your Wall

Your sauna size will determine your material cost and amount. So you’ll have to measure your space. According to that measurement, buy your materials.

It can be a big one if it fits your budget. Or even a small one. Just like your shower measurement, go for whatever fits your purpose well!

Frame your wall vertically and line them horizontally. Leave off a 4-inch gap between your exterior wall and sauna wall. Then, set your walls and your ceiling accordingly. 

When hanging your sauna door, keep one thing in mind. Make sure your door frame has a 4-inch gap. That is, in between your basement floor and door’s bottom edge.

Step 3 of 5: Connect Your Power Lines

Let’s install the heater power lines. But first, decide on your heater size. After you’ve done deciding, run the power line through it. Maintain all the electrical requirements and you’ll be all set there.

To make this simpler we have a guideline mentioning all the necessary info.

Amps 240 VAC9.614.419.224.028.836.043.450.5
Wire Size#14#14#12#10#10#8#6#6
Room Volume (cubic feet)100150200250300375450525

Here we have summarised the voltage, wire, and room size to better facilitate you.

Step 4 of 5: Install Your Sauna Walls

For the walls, you’re going to need ½-inch plywood. It’ll be installed on the exterior walls, floors, and ceiling. Make sure to put those in tightly, because you don’t want your wall to fall out like your bed slats.

To customize it according to your style, you can paint or stain the wood.

Moreover, you can use panels from a sauna DIY kit to install your wall. After that, put up your plywood. This will make your sauna more robust. Next, install the cedar boards on your interior walls. 

Create tongue-and-groove edges on these boards. Use a bench saw to do this. Then use zinc plated screws to fasten them on. This will better hold the steam in your sauna as it’s a tighter fit.

We install this added layer to better protect the wall underneath. Even though we want a sauna, we can’t damage our walls. Just like how we should carpet tile without actually harming it.

Step 5 of 5: Install Your Heater

The best place to install your heater is in a corner of the sauna. Or in the middle of the floor. Before buying the heater, make sure it’s designed for a sauna.

To make your buying process a little easier, we have a list for you! Here are some of the most recommended sauna heaters:

Product 1
Product 2

We hope you love these as much as we do!

Now that you’ve made your choice, it’s time to install your heater. The temperature should be set to 185°F. Don’t set it anywhere over 220°F or else it’ll be a health risk. After you’re all done, just set back and start relaxing!

With our guide, the building process will be very easy. Go make your own sauna and enjoy!


Question: How long should you sit in the sauna?
Answer: It is recommended to use the sauna for 15 to 20 minutes. But no longer than 30 minutes. This is because any longer and we can risk dehydration. 

Question: Should I drink water in the sauna?
Answer: Yes! A full glass of water before and after is recommended. This is to avoid getting dehydrated. You can also drink a glass of coconut water after using the sauna. This will restore your electrolyte balance.

Question: Is it OK to sauna everyday?
Answer: Yep, for sure! It is definitely safe to use your sauna every day. But first, consult a doctor. Moreover, take your doctor’s advice if you have any medical condition. 


Ahh, that brings us to the end. You should know how to build a sauna in your basement. Hope you have a fun experience doing so.

If you face any trouble with the installation, be sure to contact a professional.

Good luck with your work!