I'm an agency and was fined over a tourism residence rental. Isn't the homeowner solely responsible in these rentals?

No. For 2026, intermediaries who broker the tourism rental of homes lacking a permit face an administrative fine of 180,617 TL per contract. The same fine applies where a rental is not delivered to the user under the conditions stated in the contract, and again where misleading promotion is made or the conditions promised in vouchers, brochures and other promotional materials (including duration) are not met. You should therefore proceed only after securing the permit applications and permits for every property in your portfolio that you broker or plan to broker. Track the outcomes of pending applications too — the Regulation requires a legible copy of the permit to be published everywhere the property is marketed.