The academy was created in September 2009 to replace the Northfields Technology College and this latest project provides extra accommodation for 740 pupils between the ages of 13-18.
The Willmott team will now work on the pre-construction stage, with a planning application submitted at the end of October.
Willmott Dixon aims to sign the main contract with Central Bedfordshire Council by Spring 2011.
Chris Tredget, managing director for Willmott Dixon in the Northern Home Counties, said: “We are committed to investing 50% of the subcontractor spend with local businesses within a 30 mile radius.
“We will use local companies for a range of services, from groundworks and roofworks to brickwork, joinery, catering and security.”
The scope of project involves 85% new build, with a 15% refurbishment of the existing property as the current sports hall and gym are carefully integrated into the new academy.
Accommodation is predominantly provided on ground and first floor and the design by Lyster Grillet & Harding Architects will provide flexibility to enable future expansion to meet long-term education demands throughout the building’s lifespan.
All Saints Academy will also benefit from passive light and ventilation to reduce energy demands and its overall carbon footprint of the building, with renewable technologies expected to provide over 20% of energy needs.