Nicholas Grimshaw & Partners' £75million Eden Project is the best building of the past 50 years, according to research commissioned to mark the 50/50 - Crowning Achievements/Future Products exhibition at London's Building Centre.
Pollsters in the AJ survey questioned 407 visitors to Interbuild 2002 on the best building, the greatest feat of engineering, the favourite construction product and the greatest innovation.
The visitors voted for Jørn Utzon's Sydney Opera House as second best building, with third place going to Le Corbusier's Ronchamp Chapel.
Cesar Pelli's No 1 Canada Square at Canary Wharf came in forth, and fifth was Foster and Partners' Hongkong and Shanghai Bank.
The Channel Tunnel won the vote for the most impressive engineering project, followed closely by Marks Barfield Architects' British Airways London Eye. In third place was the Thames Barrier, with the London Underground's acclaimed Jubilee Line Extension in fourth and Foster and Partners' Chep Lap Kok Airport fifth.
Meanwhile, the improvements in glass technology meant that glass products were voted the past half-century's most useful building products.
And the most revolutionary innovation for the construction industry was overwhelmingly considered to be the computer. Mobile phones lagged a long way behind to take second place.
The full results were set to be revealed at an event at the Building Centre in London in the presence of the Duke of Gloucester today.