Isabel Bratos joins as account manager from etc.venues where she held the position of sales co-ordinator for almost two years, while former Trafalgar Hilton conference and events sales manager Mia Parsons takes on the role of of diary manager.
Bratos and Parsons join a team of seven who are responsible for selling the 23 function rooms at 66 Portland Place, which include spaces for events from two to 400 guests with floor to ceiling windows, views over London and outside terraces.
Parsons will be responsible for maximising the use of the rooms through managing the booking diary and converting external enquiries into confirmed business, while Bratos will sell, market and co-ordinate the event facilities.
RIBA's head of venues, Stephanie Ellrott, said: "We are celebrating a great year at RIBA Venues with healthy booking numbers so we are delighted to have Isabel and Mia on board to help process these wins and lead us into an equally healthy 2015. Both have industry experience which makes them a real asset to our growing team."