How do I prevent unauthorized parties at my Airbnb?

The best party prevention happens at the booking stage, before anyone has a key, because once a party is underway your options shrink to damage control. Screen who you're accepting: look at profile completeness, reviews from other hosts, and verification, and treat the classic risk pattern with real caution, the local, one-night, weekend booking from a brand-new account, or anything openly described as being for an "event." State "no parties or events" in both your listing and your house rules, cap occupancy, and say plainly that unregistered visitors aren't allowed, so you've got clear footing if you need it.

Technology backs that up rather than replacing it. Noise monitors like Minut or NoiseAware flag a spike in decibels without recording anyone's conversation, which is the point: you learn a party's building before the neighbours call, not what anyone said. Smart locks with per-guest codes tell you exactly who came and went. Outdoor cameras covering only the entry, disclosed in your listing, and occupancy sensors round it out. A calm pre-arrival note helps too: a line reminding guests it's a residential street with 10pm quiet hours and no events sets the tone, and a concierge can send that to every booking automatically.

If it happens anyway, move fast and document. Call the guest, or have your concierge escalate to you the moment noise or occupancy trips. Save everything (monitor data, camera stills, neighbour messages), then call Airbnb's emergency line, file for any damage through their coverage, and leave an honest review so the next host sees it coming. Airbnb has tightened up here too, blocking some one-night bookings by new accounts and running party-risk detection in certain markets, but none of that replaces you screening at the door.