Can they charge you this?
Pick what you are being asked to pay when renting and see whether it is legal, with the article of the law to reply with.
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What to do if they ask you
Reply in writing and cite the article. Keep the listing, the draft contract and any invoice or receipt showing the charge: they are your evidence.
Keep in mind
These are the rules for LAU housing contracts, as worded by Real Decreto-ley 29/2026, pending validation by Congress: if it is not validated, they could change.
This tool is general information, not legal advice: if the amount matters, confirm your case with a professional.