As part of their New Zealand tour, the Royal couple requested a normal service at the cathedral on April 13, the start of Holy Week.
The cathedral would not be closed before the service, as ''the doors of the cathedral are always open to people'', Anglican Church spokesman the Rev Jayson Rhodes said.
''It is worship as usual.''
However, because of the potential popularity of the service, tickets will be issued to members of the public wanting to attend the service at the 400-person capacity cathedral.
Only a small number of tickets were available to ensure groups associated with the cathedral were able to attend.
The Dean of St Paul's, the Very Rev Dr Trevor James said it was ''an honour for the cathedral to host the royal couple as they attend worship at the beginning of Holy Week''.
He extended an invitation to those wanting to worship alongside the couple to secure their tickets.
On the day of the service, all streets around the cathedral would be closed.
However, passengers could be dropped at the gates of the cathedral car park, which would also provide the only access to the building for ticket holders.
Palm Sunday admission to the cathedral would be from 9am and the entire congregation was to be seated by 9.45am.
In addition to the church service, the Duke and Duchess of Cambridge will also watch Rippa rugby and local entertainment at Forsyth Barr Stadium.
Premium seats for that event are also ticketed, with free tickets available from the stadium's Gate A box office or via www.ticketdirect.co.nz.
General stand admission without a ticket is also possible on the day of the event.
Palm Sunday service
Ticketing arrangements are. -
• All ticket applications must be to the St Paul's Cathedral administrator via office@stpauls.net.nz or PO Box 5205, Dunedin 9058.
• Applications must be received by Tuesday, April 2.
• Numbers may be limited because of space.
• Details required include the names of ticket holders, and contact details (email, phone and address).
• ID required when collecting tickets; tickets posted to those living outside Dunedin.
