The winners of these awards make up the longlist from which the shortlist for the Stirling Prize 2005 will be chosen.
Any building in the European Union (EU) by an RIBA member, whether it is a small house extension or a new museum, is eligible to enter.
The only requirement is that the projects should exhibit design excellence and should have been completed between 1 January 2003 and 3 March 2005.
For the second year, the RIBA has also announced that it will run the RIBA Worldwide Awards. These new awards will be for developments outside the EU where the building has been designed by a UK practice with at least one RIBA member as principal.
Unlike all other RIBA awards, these schemes will not be visited but will be judged by the RIBA Awards Group with the advice of local experts.
The institute's head of awards, Tony Chapman, said: 'The RIBA Awards continue to recognise the best of British architecture. With the success of the first RIBA Worldwide Awards last year, the awards are now able to reflect the way Britain uniquely exports the work of its architects to the rest of the world.'
'This is also the 10th year of the RIBA Stirling Prize and we're hoping that an especially strong field of RIBA Award winners will produce worthy contenders for the trophy,' he added.
Winners will be announced at an RIBA Awards dinner supported by The Architects' Journalon 17 June 2005.
Entry forms for the RIBA Awards and the RIBA Worldwide Awards can be downloaded from www.riba-awards.com or are available from Caz Facey in the RIBA Awards Office on 020 7307 3715 or email firstname.lastname@example.org.
The closing date for entries is 3 March 2005.