Request to book is available to all markets on Booking.com.
The feature allows hosts to disable "Instant booking" and asses booking requests from guests before accepting them.
You can read more about the request-to-book feature and how to enable it on Booking.com here.
Eligible property types
The request to book feature is not available for all property types.
The feature was intended for short-term rental hosts, and not for hotels.
Eligible property types are:
Holiday homes
Apartments
Villas
For any questions about your eligibility or about the request to book feature in general, please contact Booking.com's support directly.