Thanks, yes, that is doable, and some seem to do so. However:
1. This info we need to sink somewhere in our communication to guests BEFORE they book & pay on airbnb...such stuff should not come as a "welcome present" @ check-in
2. It does not look professional - here "official" airbnb booking & price with all details and there a "manual posthum add-on" somewhere in the text or later communication.
There are portals that allow to clarify such cost items right at first guest contact on the portal. Usually, under pricing section listed and the host picks if
- included in airbnb price
- locally charged flat per night with stated rate
- locally charged depending on metered (!) usage with stated rate
airbnb already has a section for additional cost items, however, no item like electricity & Co. ...very easy to add and does not interfere with airbnb billing system.
Imagine somebody has a sauna that guests may use during their stay:
- Prevoiusly, quite easy to calculate energy cost and include an average into the airbnb price. With previously low energy prices sauna usage got "lost in the roundings", so even non-sauna-users were not "punished" overproportionally.
- Now, energy cost of a single sauna usage may add up for the host to 10-15% of the airbnb price / night. So hosts have to either eliminate sauna usage from their offer, or increase airbnb price by that % (+ that % on the airbnb fee) to not end up at a loss.
The solution as outlined above could be easy & transparent as outlined above...as long as it is not implemented, unfortunately your proposal will be the only way to go...