ᐅ Converting a Basement Room into a Wellness Area – Assessment

I would like to convert a roughly 25 square meter (270 square feet) room in the basement into a wellness area. I have no knowledge of construction or renovation and don’t know anyone who does, so I can't really estimate if or how this would be possible.

Step 1 would be to get some assessments or opinions on whether this is realistically feasible, what would need to be done, and what kind of costs I might expect (just a general idea of the scale, not exact figures).

The room at the moment

This isn’t a typical cold or damp basement room; it was used for a long time as a bedroom and office.
There is a door, a double casement window, some electrical outlets, a chimney damper, a radiator, and tiled flooring.
No water or wastewater connections, no high-voltage electrical supply, no ventilation.

What I would like

• a small sauna (for 2 people)
• a shower, possibly with an integrated steam bath (otherwise maybe a separate steam room, or none at all)
• something like a fountain (fixed to the floor) – the sound of trickling water is very relaxing for me; ideally, it should be possible to sit on the edge or rest your feet
• ventilation (exhaust system?) – partly to prevent mold, but also because I find the sound of airflow relaxing (as long as it is a steady white noise)
• indirect lighting along the ceiling around the entire room

What matters to me is that everything looks cohesive, with a design that is well coordinated, almost like a small hotel’s wellness area. Because of this, I assume I would need an expert who offers a comprehensive service or coordinates everything and takes care of details (like hiding cables properly, making the sauna appear integrated into the floor and tiles rather than “just placed” there, etc.).

My questions

• Are there experts who provide this kind of full-service or complete coordination? What should I be looking for?
• Is it feasible to retrofit water and wastewater connections into an existing room? The main water supply is also in the basement. I imagine it might be “simple” to connect a branch off the existing pipe and lead it into the room. But how does wastewater work? Would the floor have to be broken up and dug out?
• If the sauna requires high-voltage power, is it easy to install that afterwards?
• The floor is tiled (although I would like to use different tiles), but the walls and ceiling are not plastered. Do the walls and ceiling need special treatment to prevent moisture problems?
• For a room this size (about 25 m² [270 square feet]), is a ventilation unit that is partially or fully wall-mounted sufficient, or would something installed in several places on the ceiling be necessary?
• What am I not considering?
• Am I crazy?
• How would you estimate the cost? (Feel free to comment on individual parts if you have knowledge about them.)

Neyla89 schrieb:

Are there specialists who offer this as a complete service (or manage the entire coordination)? What should I look for?

Look for high-end bathroom designers or sauna builders.

Neyla89 schrieb:

Is it feasible to retrofit a room with water supply and drainage? The main water connection is also in the basement. I can imagine that you could "simply" connect a new line to the existing pipe and run it to the room. But how does drainage work? Does the floor have to be broken up and excavated?

That depends on the exact situation. Keywords here are sewage lifting station or sump (with a pump).

Neyla89 schrieb:

If the sauna requires three-phase power – is that easy to install afterwards?

Again, it depends. Three-phase power (400V) is suitable for many quality (more powerful) sauna heaters. Where is the electrical panel? How can the cables be routed?

Neyla89 schrieb:

The floor is tiled (though I would prefer different tiles), but the walls and ceiling are unfinished. Do the walls and ceiling need special treatment to avoid moisture problems?

A wellness area with bare walls? That won’t work. Good ventilation is key, regardless of whether you use tiles, plaster, wood paneling, or anything else.
Is the basement insulated from the outside? Otherwise, humidity might still condense on the cold basement walls.

Neyla89 schrieb:

For the room size (about 25 m² (270 sq ft)), is a single unit mounted on/in the wall sufficient, or do you need something installed in multiple places under the ceiling?

What do you mean by "a single unit"?

Neyla89 schrieb:

Am I crazy?

Great idea!!! Who wouldn’t want something like that. Even though a home sauna consumes a lot of electricity, and you could probably spend your evenings twice a week at a great commercial sauna for the price of your investment for the rest of your life.

Neyla89 schrieb:

How would you estimate the costs? (Even partial estimates for specific parts are welcome if you know about them)

No idea. For high-end equipment — since you want it to look nice — I would guess around €30,000 (±€10,000).

Jo, everything sounds doable. I agree with the previous speaker. I think the costs will be around 30,000 to 50,000 euros.

Neyla89 schrieb:

Are there experts who offer this as a complete service (or coordinate everything)?

You can get anything for the right price.
How much are you willing to invest? Some figures have already been mentioned for reference.

The budget is one thing.
I hardly know any wellness areas in basements that are actually used. Such facilities make more sense on the garden level, sleeping level, or bathroom area.
You will need 400V power, water, and drainage...
With 30,000 to 50,000 (depending on currency) you can certainly do something. There is no upper limit.
However, you will require wall openings and will also need to break up the floor.
Since I am not a sauna user, I would rather build a small pool in the garden.