# Basement apartment as AirBnB
**URL:** https://forum.mustachianpost.com/t/basement-apartment-as-airbnb/17676
**Category:** Real Estate
**Created:** [November 15, 2025, 5:34am UTC](https://forum.mustachianpost.com/t/basement-apartment-as-airbnb/17676 "2025-11-15T05:34:05Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Schwarzpulver](https://forum.mustachianpost.com/u/Schwarzpulver)
#### Post date: [November 15, 2025, 5:34am UTC](https://forum.mustachianpost.com/t/basement-apartment-as-airbnb/17676/1 "2025-11-15T05:34:05Z")
Hi everyone
Our old and quite small house is in need of renovation. Instead of raising the roof for more space we are thinking of renovating the 1940s cellar and adding a small apartment. This would be ideal if our parents were coming to visit. As I am interested in the concept of multiple income streams I would also like to rent out the apartment for a few days per year. Does anyone have experience or advice?
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### Author:  [@nabalzbhf](https://forum.mustachianpost.com/u/nabalzbhf)
#### Post date: [November 15, 2025, 6:30am UTC](https://forum.mustachianpost.com/t/basement-apartment-as-airbnb/17676/3 "2025-11-15T06:30:29Z")
Do check for radon presence tho, it’s extremely common in Switzerland (can be an issue even in ground floor, but basement would be worse usually).
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### Author:  [@Guillaume\_GVA](https://forum.mustachianpost.com/u/Guillaume_GVA)
#### Post date: [November 15, 2025, 9:03am UTC](https://forum.mustachianpost.com/t/basement-apartment-as-airbnb/17676/4 "2025-11-15T09:03:01Z")
Depending on the local geological risk, it’s forbidden to have bedroom in the basement.
To be checked with the local authorities if your plan is even doable.
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### Author:  [@dom.swiss](https://forum.mustachianpost.com/u/dom.swiss)
#### Post date: [November 15, 2025, 10:28am UTC](https://forum.mustachianpost.com/t/basement-apartment-as-airbnb/17676/5 "2025-11-15T10:28:16Z")
> [@nabalzbhf](#):
>
> radon presence
Highest concentrationof radioactive radon found in affected regions in cellars with natural flooring, e.g. sand or gravel.
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### Author:  [@nabalzbhf](https://forum.mustachianpost.com/u/nabalzbhf)
#### Post date: [November 15, 2025, 1:09pm UTC](https://forum.mustachianpost.com/t/basement-apartment-as-airbnb/17676/6 "2025-11-15T13:09:52Z")
Tho from what I heard, even somewhat recent built with proper floor can have very unhealthy radon concentration (it’s easy for the gas to seep through if extra care wasn’t taken). If you’re in a ground floor it’s worth checking.
(also in Kita, those are often in ground floors)
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### Author:  [@newhere](https://forum.mustachianpost.com/u/newhere)
#### Post date: [November 16, 2025, 10:50am UTC](https://forum.mustachianpost.com/t/basement-apartment-as-airbnb/17676/7 "2025-11-16T10:50:30Z")
Radon risk can be checked here:
> **[Das Wichtigste zum Thema Radon für Gebäudeeigentümer und Bauherren -...](https://www.schutz-vor-naturgefahren.ch/bauherr/naturgefahren/radon.html?pk_campaign=%28s-CH-de%29%20Radon&pk_source=google&pk_medium=cpc&gad_source=1&gad_campaignid=16682869108&gbraid=0AAAAACzakEnDSpnpKnixR1XC1uPr6544v&gclid=Cj0KCQiAiebIBhDmARIsAE8PGNJYYMOBzUfIrvf5lYHeZ-QEYtFYcESIb47W5A20B42HHKgpaQbJm3caAoOOEALw_wcB)**
>
> Das Radonrisiko ist regional sehr unterschiedlich. Wann eine Radonmessung sinnvoll ist, welche Grenzwerte einzuhalten sind und welche Schutzmassnahmen infrage kommen, erfahren Sie hier.
to measure it you need to put a sampling device in the basement, I think for 1 year.
Otherwise: Do you have windows in the basement? Thos would be a must. Otherwise, in my experience, with houses at this age it is not possible to habe a real „Wohnkeller“. The climate will always be different, because they did not insulate the base floor and the walls as it is done today. We have a basement with windows which is only partially under ground. We can heat it and it is perfect for my homeoffice (used only 1-2 days/week), laundry room and guest room. But I wouldnt want somebody to stay longer, because the climate is different
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### Author:  [@Giff](https://forum.mustachianpost.com/u/Giff)
#### Post date: [November 16, 2025, 3:06pm UTC](https://forum.mustachianpost.com/t/basement-apartment-as-airbnb/17676/8 "2025-11-16T15:06:48Z")
A couple neighbours (also living in 1940’s houses) have a bedroom in the basement. They don’t rent it out though, only use it for guests. Let us know what you find out, I also have such a basement 🙂