Can I put a shower under my stairs?

[Houseplantmad]

Is it possible to install a shower under my stairs in a mid-terrace house i.e. no outside wall for ventilation please? How could I deal with the steam. The water supply, drainage etc is already there. Any experience gratefully received, perhaps @pigletjohn may be able to advise also please?

We have an internal bathroom, somehow it has a vent to the outside but it’s hidden, so that is possible.

Do you already have a loo and sink next to it? Seems a bit strange to have a shower with no sink or loo accessible.

www.godownsize.com/toilets-bathroom-built-in-under-staircases/

You will need a powerful and quiet extractor fan, which needs to run during and after every shower until the enclosure is dry. This may take quite a long time.

Is there an external wall?

Oh, I see there isn't.

You can perhaps run a 100mm diameter rigid duct under the ceiling of the adjacent rooms until it can exit through an external wall. Sometimes it can be concealed above or inside wall cabinets in a kitchen. If planned into house construction it might be possible to put it between joists if they run that way. Sometimes it can go in a garage.

At enormous expense you could plumb in a split-unit air conditioner or dehumidifier

Had some friends as a student who had this in their (admittedly hovel-like) student house. It was grim. You had to keep the door open whenever it wasn’t being used, in the hope of getting it aired - so that’s a door left open blocking the hallway all the time.

Thank you all. Yes there will be a loo and basin, even if we don't go ahead with a shower. Thanks @PigletJohn that's interesting re ducting. I will investigate the possibilities of this with the builder.

We had a downstairs loo put in at the back of the garage with no access to the outside. Building regs insisted on an extractor which had to be fed through the garage to the outside and totally boxed in. I imagine you'd need something similar.

You certainly need an extractor for a WC, and a solid sound-muffling door.

Curiously our builder didn't seem to think we needed an extractor so had to retrofit it at their own expense!! As for the sound muffling door, I've never known a bathroom to have a door any different to the other internal doors in the house.

Well you have now.

Not sure we have a toilet downstairs wit no window
Terraced house is only 8 years old has extractor that goes up through bathroom and out that way.
How big is your understairs to fit all that in though ?