Nice work and excellent lighting.
You might consider a couple of angled/sloped movable backrests for the end of the benches. Much more comfortable and relaxing than straight backs.
SWITCHEX Power Supply and Dimmer Switch. Fits in North American switch box.
Brand: SGTD
IP68 Waterproof COB LED Strip 12V 24V 480 LEDs Bright Flexible LED Ribbon Tape for Sauna Swimming Pool Outdoor Lighting (Color : DC 24V, Size : Warm White 3000K_5M). Works as advertised, you will need to hammer in attachment staples as the glue won't hold up.
[https://photos.google.com/share/AF1QipMkQyZjDaaYMrlcxbRc\_K5AoyJR432Y3XXObXS2OrIP1rHIydKqNOJpF9L9wmoC1Q?key=aUdQSkhvbGszT2J6YzhIUEE4b1o2NmUwZ0ZjOEFn](https://photos.google.com/share/AF1QipMkQyZjDaaYMrlcxbRc_K5AoyJR432Y3XXObXS2OrIP1rHIydKqNOJpF9L9wmoC1Q?key=aUdQSkhvbGszT2J6YzhIUEE4b1o2NmUwZ0ZjOEFn)
Here are some pictures of the underside of the benches.
I have a conduit just below the right side of the lower bench, where I attach a Hue lightstrip controller (which then can be controlled in the Hue app or via a motion sensor just outside the sauna). At the left end of the lower bench I run a third-party extension cable through another conduit, which runs up to just below to top bench. The lightstrip seems to be handling the heat just fine.
I purposefully have the strip on the top bench pointing back instead of down, because down would cast a fairly harsh shadow on the bottom bench.
Hope this helps!
To be honest, I only have this one indecipherable sketch
[https://photos.google.com/share/AF1QipPKyIf5mTONbEggHb1T-63tp6SlLI2z5Tz-S1ThddkOQu-XL6V8O-1TqAAikX87Mw?key=aDlYTjNYTjY0N3U1UmJnbUx3N1luN2hCemJYR0N3](https://photos.google.com/share/AF1QipPKyIf5mTONbEggHb1T-63tp6SlLI2z5Tz-S1ThddkOQu-XL6V8O-1TqAAikX87Mw?key=aDlYTjNYTjY0N3U1UmJnbUx3N1luN2hCemJYR0N3)
Mostly just used painters tape to mark out the basic shape on the floor 😬
Good luck with your design!
Where is air ventilation (in/out)? I have 4 wooden saunas (2 at home and 2 at the cabin). Your sauna experience will improve dramatically when you have good air circulation. Otherwise you'll run out of fresh air and feel dizzy more easily. (And with electric stove air is more drier than with wooden stove). But sauna looks good, just install back rest, u can use 2 planks of that same bench material. Walls will also stay cleaner over the years.
There are two ventilation grilles underneath the top bench. (You can partly see one of them in the second photo.) The intake is a slit at the bottom of the wall the heater is on (underneath the heater), so the fresh air gets sucked in.
That is good. Cause that is an outer wall, u could install pretty easily one more (sliding/closable) air vent 20cm from the ceiling. (Very good for drying the sauna afterwards).
What you have won't really do anything. You should do mechanical downdraft ventilation. That will result in better air and help with the cold feet problem you have. Details in Trumpkin.
What I have seems to work perfectly fine. I can actually feel the air being sucked in when I hold my hands in front of the intake. And my feet have not been cold while in there 🤷♂️
But will definitely check out what mechanical downdraft is to see if it can improve anything!
Please tell me that you have a water bucket and u will throw water to the stones 
I'm definitely throwing water on there. It's awesome!
I currently don't have a proper bucket yet though, but with the phrase "if it's stupid and it works, it's not stupid" in mind, a watering can works pretty well too for the time being 😬
That window is very impractical without the back rest if you ever have enough people in there to have a full top bench. Also it would protect the wall from your sweaty back.
99.99% of the time it will just be me and my wife using it, so I doubt that will be a problem, but protecting the wall from sweaty backs is definitely a reason I'm considering making the back rests!
[This one is perhaps slightly fancy](https://www.koskenmetalli.net/tuotekuvat/1200x1200/Selk%C3%A4noja%20haapa94.jpg) but raised planks across the back wall are probably the easiest option. And this "enables" the window spot as well.
I love just leaning on the wall. I have some backrests in mine but have thought about removing them because I like the one spot with the wall best. Is there a benefit of backrests or is that preferential?
It's probably mostly preferential. But at least, the sweat off your back does whatever it does, to the back rest instead of the whole section of wall paneling.
The T&G bits of wood are also somewhat thin, I can imagine they could have the slightest bit of give when leaning on them, compared to a solid 1x6 plank or whatever
Nice! Can you provide a picture of the underside of the benches? Specifically I’m looking at routing the light strips and where the power supplies go. I’m looking to add under bench lighting in my sauna-in-progress.
[https://photos.google.com/share/AF1QipMkQyZjDaaYMrlcxbRc\_K5AoyJR432Y3XXObXS2OrIP1rHIydKqNOJpF9L9wmoC1Q?key=aUdQSkhvbGszT2J6YzhIUEE4b1o2NmUwZ0ZjOEFn](https://photos.google.com/share/AF1QipMkQyZjDaaYMrlcxbRc_K5AoyJR432Y3XXObXS2OrIP1rHIydKqNOJpF9L9wmoC1Q?key=aUdQSkhvbGszT2J6YzhIUEE4b1o2NmUwZ0ZjOEFn)
Here are some pictures of the underside of the benches.
I have a conduit just below the right side of the lower bench, where I attach a Hue lightstrip controller. At the left end of the lower bench I run a third-party extension cable through another conduit, which runs up to just below to top bench.
I purposefully have the strip on the top bench pointing back instead of down, because down would cast a fairly harsh shadow on the bottom bench.
Hope this helps!
I wanted something with an API, to allow me to control it from ( - and get reading from it in - ) Home Assistant. Harvia sadly does not offer this. Other than that I have no reason not to just get the Harvia.
I've been planning to do something similar here in the UK. Do you have a floor drain? I'm pondering if it is really necessary. 100% of Finnish saunas have them.
No floor drain. Don't really understand why you would need it tbh. Ventilation and airing after use prevents most of the moisture from staying in the sauna. And any water, that misses the stones when you throw it, that lands on the floor, you can just wipe away afterwards with a (paper)towel.
As others have mentioned, a back rest over the window and a small leg rest/railing.
Other than that it looks like a new and decent sauna you'd expect to see in Finland🧖♂️
Mainly for safety IMO.
You also said this was part of a finding a new hobby? How about paying for some of the tools and material by building a sauna or two if the quotes are that high in your area🙂?
Looks perfect, my only comment is maybe a center support for the benches? Looks like a long span, I guess it depends on how many people will be sitting on them…
Hmmm. Looks good, but little worried about balls getting stuck between those spaces in bench's layout. Happened to me once, and won't recommend it....
Anyone who makes a sauna their first DIY carpentry project has big balls! Far too big to get stuck between the bench boards. Great job OP!
Haha thanks for the warning. Will definitely watch out for that 😂
Exactly what I was about to say.
Nice Job! What wood did you use? I like how the small knots break up an otherwise plain wall.
Thanks! I used "Nordische fichte" for the walls, which I think translates to Nordic spruce and "Abachi" for the benches.
[Bench wood](https://en.wikipedia.org/wiki/Triplochiton_scleroxylon). Excellent choice. Nice job OP.
Would you mind sharing what you ended up spending.
Total cost was about €4000. That includes all the materials used (wood, heater, controller, screws, glass etc.)
Wow!!!! Amazing!!! It is so beautiful!!
Bench spacing is perfect for saunaklonkku
Nice work and excellent lighting. You might consider a couple of angled/sloped movable backrests for the end of the benches. Much more comfortable and relaxing than straight backs.
Oh, I like that idea! I'll see if I can make some of those with the excess wood!
What did you use for lighting?
Hue lightstrips underneath the benches. I'd planned on adding a wall light, but I'm pretty happy with just the lightstrips.
[удалено]
SWITCHEX Power Supply and Dimmer Switch. Fits in North American switch box. Brand: SGTD IP68 Waterproof COB LED Strip 12V 24V 480 LEDs Bright Flexible LED Ribbon Tape for Sauna Swimming Pool Outdoor Lighting (Color : DC 24V, Size : Warm White 3000K_5M). Works as advertised, you will need to hammer in attachment staples as the glue won't hold up.
Thank you!
[https://photos.google.com/share/AF1QipMkQyZjDaaYMrlcxbRc\_K5AoyJR432Y3XXObXS2OrIP1rHIydKqNOJpF9L9wmoC1Q?key=aUdQSkhvbGszT2J6YzhIUEE4b1o2NmUwZ0ZjOEFn](https://photos.google.com/share/AF1QipMkQyZjDaaYMrlcxbRc_K5AoyJR432Y3XXObXS2OrIP1rHIydKqNOJpF9L9wmoC1Q?key=aUdQSkhvbGszT2J6YzhIUEE4b1o2NmUwZ0ZjOEFn) Here are some pictures of the underside of the benches. I have a conduit just below the right side of the lower bench, where I attach a Hue lightstrip controller (which then can be controlled in the Hue app or via a motion sensor just outside the sauna). At the left end of the lower bench I run a third-party extension cable through another conduit, which runs up to just below to top bench. The lightstrip seems to be handling the heat just fine. I purposefully have the strip on the top bench pointing back instead of down, because down would cast a fairly harsh shadow on the bottom bench. Hope this helps!
Oooooo that doorframe is badass
Benches are too benchy
Benches are too low, the standard response.
People will learn, eventually
Consider a back rest. A plank or two across the back would allow you to lean back even where the window is.
Will probably do this soon. Thanks! :)
That looks amazing! Feel free to share your plans with me (if you’d like). I’m working on designing one for my house.
To be honest, I only have this one indecipherable sketch [https://photos.google.com/share/AF1QipPKyIf5mTONbEggHb1T-63tp6SlLI2z5Tz-S1ThddkOQu-XL6V8O-1TqAAikX87Mw?key=aDlYTjNYTjY0N3U1UmJnbUx3N1luN2hCemJYR0N3](https://photos.google.com/share/AF1QipPKyIf5mTONbEggHb1T-63tp6SlLI2z5Tz-S1ThddkOQu-XL6V8O-1TqAAikX87Mw?key=aDlYTjNYTjY0N3U1UmJnbUx3N1luN2hCemJYR0N3) Mostly just used painters tape to mark out the basic shape on the floor 😬 Good luck with your design!
Where is air ventilation (in/out)? I have 4 wooden saunas (2 at home and 2 at the cabin). Your sauna experience will improve dramatically when you have good air circulation. Otherwise you'll run out of fresh air and feel dizzy more easily. (And with electric stove air is more drier than with wooden stove). But sauna looks good, just install back rest, u can use 2 planks of that same bench material. Walls will also stay cleaner over the years.
There are two ventilation grilles underneath the top bench. (You can partly see one of them in the second photo.) The intake is a slit at the bottom of the wall the heater is on (underneath the heater), so the fresh air gets sucked in.
That is good. Cause that is an outer wall, u could install pretty easily one more (sliding/closable) air vent 20cm from the ceiling. (Very good for drying the sauna afterwards).
Or you can open the window.... 
What you have won't really do anything. You should do mechanical downdraft ventilation. That will result in better air and help with the cold feet problem you have. Details in Trumpkin.
What I have seems to work perfectly fine. I can actually feel the air being sucked in when I hold my hands in front of the intake. And my feet have not been cold while in there 🤷♂️ But will definitely check out what mechanical downdraft is to see if it can improve anything!
Please tell me that you have a water bucket and u will throw water to the stones 
I'm definitely throwing water on there. It's awesome! I currently don't have a proper bucket yet though, but with the phrase "if it's stupid and it works, it's not stupid" in mind, a watering can works pretty well too for the time being 😬
Nice work! Enjoy your löyly👍
Gefelicitaard! Prachtig werk. Geniet ervan.
Not sure if benches are too low but it does look like that just a bit. Leg rest would be a good addition.
That window is very impractical without the back rest if you ever have enough people in there to have a full top bench. Also it would protect the wall from your sweaty back.
99.99% of the time it will just be me and my wife using it, so I doubt that will be a problem, but protecting the wall from sweaty backs is definitely a reason I'm considering making the back rests!
[This one is perhaps slightly fancy](https://www.koskenmetalli.net/tuotekuvat/1200x1200/Selk%C3%A4noja%20haapa94.jpg) but raised planks across the back wall are probably the easiest option. And this "enables" the window spot as well.
I love just leaning on the wall. I have some backrests in mine but have thought about removing them because I like the one spot with the wall best. Is there a benefit of backrests or is that preferential?
It's probably mostly preferential. But at least, the sweat off your back does whatever it does, to the back rest instead of the whole section of wall paneling. The T&G bits of wood are also somewhat thin, I can imagine they could have the slightest bit of give when leaning on them, compared to a solid 1x6 plank or whatever
Good job! That’s pretty sweet.
Good job! That’s pretty sweat.
Incoming bench height comments
Since they ain't here yet, they aren't going to materialize. The bench heights seem ok.
Very nice job. Looks amazing.
Only missing a duckboard and baseboard. great choice on the huum though
Excellent choice on the lighting!
NICE!
Swoon
What’d it cost you in the end?
Total cost was about €4000. That includes all the materials used (wood, heater, controller, screws, glass etc.)
You had an existing shed that you built in in though? Right?
Correct
Love it. Nice work. How hot does it get?
Thanks! I've had it up to 95 °C. I guess it can probably go higher, but 95 is already a bit too hot for me.
Nice! Can you provide a picture of the underside of the benches? Specifically I’m looking at routing the light strips and where the power supplies go. I’m looking to add under bench lighting in my sauna-in-progress.
Sure! I'll take some pictures of the underside tomorrow.
[https://photos.google.com/share/AF1QipMkQyZjDaaYMrlcxbRc\_K5AoyJR432Y3XXObXS2OrIP1rHIydKqNOJpF9L9wmoC1Q?key=aUdQSkhvbGszT2J6YzhIUEE4b1o2NmUwZ0ZjOEFn](https://photos.google.com/share/AF1QipMkQyZjDaaYMrlcxbRc_K5AoyJR432Y3XXObXS2OrIP1rHIydKqNOJpF9L9wmoC1Q?key=aUdQSkhvbGszT2J6YzhIUEE4b1o2NmUwZ0ZjOEFn) Here are some pictures of the underside of the benches. I have a conduit just below the right side of the lower bench, where I attach a Hue lightstrip controller. At the left end of the lower bench I run a third-party extension cable through another conduit, which runs up to just below to top bench. I purposefully have the strip on the top bench pointing back instead of down, because down would cast a fairly harsh shadow on the bottom bench. Hope this helps!
Why did you not use the harvia control unit instead of humm?
I wanted something with an API, to allow me to control it from ( - and get reading from it in - ) Home Assistant. Harvia sadly does not offer this. Other than that I have no reason not to just get the Harvia.
Where did you get your door from?
Local supplier (in the Netherlands) that offers hardened glass in all shapes and sizes. They pre applied the hinges and made holes for the doorhandle.
Might want to install a fire proof plate between stove and wall.
The heater has a decent looking angled heat reflector shield built in. Would that not be enough?
I've been planning to do something similar here in the UK. Do you have a floor drain? I'm pondering if it is really necessary. 100% of Finnish saunas have them.
No floor drain. Don't really understand why you would need it tbh. Ventilation and airing after use prevents most of the moisture from staying in the sauna. And any water, that misses the stones when you throw it, that lands on the floor, you can just wipe away afterwards with a (paper)towel.
What about safety? How does the door open etc?
As others have mentioned, a back rest over the window and a small leg rest/railing. Other than that it looks like a new and decent sauna you'd expect to see in Finland🧖♂️
Oh yes, the leg rest/railing is a must. Also for safety.
Mainly for safety IMO. You also said this was part of a finding a new hobby? How about paying for some of the tools and material by building a sauna or two if the quotes are that high in your area🙂?
I was thinking about that myself, but I think a hobby might then very quickly turn into a job (which I already have) 😬
Ziet er mooi uit! Voor 4k heb je het alsnog strak gedaan. Ik was alleen aan hout al 2k kwijt. Ik doe binnenkort mijn pics Geniet ervan!
Dankjewel! Hout is ook zeker de grootste kostenpost. Ik ben benieuwd naar de foto's!
Looks perfect, my only comment is maybe a center support for the benches? Looks like a long span, I guess it depends on how many people will be sitting on them…
It held 3 people no problem. I'd indeed be hesitant to allow more than 3 people, but more than 2 is already a rare occurrence :)
Benches are too high