Duomo Florence

Do you need advance tickets to climb to the top ?

Yes, reservations to climb the dome are mandatory. Reservations for the bell tower are suggested but not required.

https://www.museumflorence.com

https://www.museumflorence.com/monuments/2-dome

If you order your tickets for the complex through the website (€15) you can make your reservations on it as well with your ticket number.

http://en.grandemuseodelduomo.waf.it/museo_dett.php?idtour=8484

Reference the copy "Have you already purchased the Cumulative Ticket? Book your entrance to the monuments!"