Olympic Delivery Authority chairman John Armitt has hailed the performance of contractors on the 2012 site as it marks three years to the London Games.
Mr Armitt said contractors could take much of the credit for the £8 billion construction project hitting its targets with three years to go to the 27 July 2012 opening of the Games.
Milestones reached include clearing most of the Olympic Park site, completing the foundations of the main stadium, starting work on transport enhancements and beginning work on the Olympic Village.
Mr Armitt said: “Four years in, we are where we wanted to be. In any construction project that is a win.
“Contractors can take a large share of the responsibility for that – at the end of the day it is them that have delivered.”
The ODA’s targets for the next 12 months are as follows:
Milestone 01: The structure of the Olympic Stadium including the roof will be complete. The first seats will be fitted and work on the field of play will be about to start.
Milestone 02: The Aquatics Centre’s permanent structure and roof will be complete and all three swimming pools will be dug out.
Milestone 03: The Velodrome structure and roof will be complete, with work about to start on installing the timber track.
Milestone 04: The structure of the International Broadcast Centre and multi-storey car park will be finished, with roof and wall cladding well underway. The Main Press Centre’s structure will be nearing completion.
Milestone 05: The Handball Arena and Basketball Arena structures will be in place with internal works underway. Building work will have begun on the new Eton Manor sporting facilities.
Milestone 06: The majority of the Olympic Village homes will be structurally finished and internal works will have started. All the major infrastructure needed to support the development will be complete.
Milestone 07: All works will be complete at the Eton Dorney Rowing venue. The new lake and competition courses at Broxbourne White Water Canoe Centre will be finished, with the facilities building almost complete. A planning application will have been submitted for the shooting facilities at the Royal Artillery Barracks.
Milestone 08: More than half of the new bridges and underpasses will be complete and parts of the Olympic Park Loop Road will be in operation. Planting will have begun across the Park.
Milestone 09: The Energy Centre, Primary Substation, main sewer and deep sewer pumping station will all be operational.
Milestone 10: All major transport improvements will be in progress or complete, and the next level of detailed planning for transport operations during the Games will have been completed.