Indoor saunas are the best for a regularly used health appliance that you just wouldn't get around to using as much if it was outdoors.
Whether you prefer the high intensity heat of the indoor traditional sauna or the body penetrating infrared waves of the indoor infrared saunas, there are many styles to choose from.
Sizes are available that can be accommodated into whatever space allowance you have. 2 person saunas are good for two or for one person that just wants a bit more room. 3 and 4 person saunas allow 2 more people comfortable space, but you can fit more people in if desired.
The larger units that are 5 to 8 person indoor saunas allow room to stretch out on benches, or benches to be modified, making room for wheelchair allowance.